diff --git a/.gitignore b/.gitignore
index 0875093..950d07a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,16 +1,9 @@
-youtube-dl
-dist/
-node_modules/
-config.php
 vendor/
 templates_c/
-ffmpeg.tar.xz
-ffmpeg-*/
 alltube-*.zip
 coverage/
-bower_components/
 config/config.yml
-docs/
 clover.xml
 i18n/*/LC_MESSAGES/*.mo
 .phpunit.result.cache
+.git/
diff --git a/.travis.yml b/.travis.yml
index c3316a3..02d0a2b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,5 +7,6 @@ addons:
       - language-pack-fr
 install: composer install --no-progress
 script:
+  - composer check-platform-reqs
   - composer lint
   - composer test
diff --git a/Dockerfile b/Dockerfile
index 949dd54..e5ac935 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,14 +1,13 @@
 FROM php:7.3-apache
 RUN apt-get update
-RUN apt-get install -y libicu-dev xz-utils git zlib1g-dev python libgmp-dev gettext libzip-dev
+RUN apt-get install -y libicu-dev xz-utils git python libgmp-dev unzip ffmpeg
 RUN docker-php-ext-install mbstring
 RUN docker-php-ext-install intl
-RUN docker-php-ext-install zip
 RUN docker-php-ext-install gmp
-RUN docker-php-ext-install gettext
 RUN a2enmod rewrite
-RUN curl -sS https://getcomposer.org/installer | php
+RUN curl -sS https://getcomposer.org/installer | php -- --quiet
 COPY resources/php.ini /usr/local/etc/php/
 COPY . /var/www/html/
-RUN php composer.phar install --prefer-dist --no-progress
+RUN php composer.phar check-platform-reqs --no-dev
+RUN php composer.phar install --prefer-dist --no-progress --no-dev --optimize-autoloader
 ENV CONVERT=1
diff --git a/README.md b/README.md
index dc606a4..e5f3151 100644
--- a/README.md
+++ b/README.md
@@ -25,10 +25,6 @@ composer install
 
 This will download all the required dependencies.
 
-(Note that it will download the ffmpeg binary for 64-bits Linux.
-If you are on another platform,
-you might want to specify the path to avconv/ffmpeg in your config file.)
-
 You should also ensure that the *templates_c* folder has the right permissions:
 
 ```bash
@@ -66,19 +62,22 @@ cp config/config.example.yml config/config.yml
 
 You will need PHP 7.2 (or higher) and the following PHP modules:
 
-* fileinfo
 * intl
 * mbstring
-* curl
+* gmp
 
 ## Web server configuration
 
 ### Apache
 
-You will need the following modules:
+The following modules are recommended:
 
 * mod_mime
 * mod_rewrite
+* mod_expires
+* mod_filter
+* mod_deflate
+* mod_headers
 
 ### Nginx
 
@@ -133,47 +132,22 @@ server {
 
 ## Other dependencies
 
-You need [avconv](https://libav.org/avconv.html)
+You need [ffmpeg](https://ffmpeg.org/)
 in order to enable conversions.
-If you don't want to enable conversions, you can disable it in `config.yml`.
+(Conversions are disabled by default.)
 
 On Debian-based systems:
 
 ```bash
-sudo apt-get install libav-tools
+sudo apt-get install ffmpeg
 ```
 
-You also probably need to edit the `avconv` variable in `config.yml`
-so that it points to your ffmpeg/avconv binary (`/usr/bin/avconv` on Debian/Ubuntu).
+If your ffmpeg binary is not installed at `/usr/bin/ffmpeg`, you also need to edit the `ffmpeg` variable in `config.yml`.
 
-## Use as library
+## Use as a library
 
-AllTube can also be used as a library to extract a video URL from a webpage.
-
-You can install it with:
-
-```bash
-composer require rudloff/alltube
-```
-
-You can then use it in your PHP code:
-
-```php
-use Alltube\Config;
-use Alltube\Video;
-
-require_once __DIR__.'/vendor/autoload.php';
-
-Config::setOptions(
-    [
-        'youtubedl' => '/usr/local/bin/youtube-dl',
-    ]
-);
-$video = new Video('https://www.youtube.com/watch?v=dQw4w9WgXcQ');
-$video->getUrl();
-```
-
-You can also have a look at this [example project](https://github.com/Rudloff/alltube-example-project).
+The `Video` class is now available as [a separate package](https://packagist.org/packages/rudloff/alltube-library)
+so that you can reuse it in your projects.
 
 ## JSON API
 
diff --git a/RoboFile.php b/RoboFile.php
index a3a53af..53f97fd 100644
--- a/RoboFile.php
+++ b/RoboFile.php
@@ -1,7 +1,6 @@
 <?php
 
 use Robo\Tasks;
-use Symfony\Component\Finder\Finder;
 
 /**
  * Manage robo tasks.
@@ -15,51 +14,33 @@ class RoboFile extends Tasks
      */
     public function release()
     {
+        $this->stopOnFail();
+
         $result = $this->taskExec('git')
-            ->args('describe')
-            ->printOutput(false)
+            ->arg('describe')
             ->run();
         $result->provideOutputdata();
-        $tag = $result->getOutputData();
 
-        // We don't want the whole vendor directory.
-        $finder = new Finder();
-        $finder->files()
-            ->in(__DIR__ . '/vendor/')
-            ->exclude(
-                [
-                    'ffmpeg/',
-                    'bin/',
-                    'anam/phantomjs-linux-x86-binary/',
-                    'phpunit/',
-                    'squizlabs/',
-                    'rinvex/countries/resources/geodata/',
-                    'rinvex/countries/resources/flags/'
-                ]
-            );
+        $tmpDir = $this->_tmpDir();
 
-        $zipTask = $this->taskPack('alltube-' . $tag . '.zip')
-            ->add('index.php')
-            ->add('config/config.example.yml')
-            ->add('.htaccess')
-            ->add('img')
-            ->add('LICENSE')
-            ->add('README.md')
-            ->add('robots.txt')
-            ->add('resources')
-            ->add('templates')
-            ->add('templates_c/')
-            ->add('classes')
-            ->add('controllers')
-            ->add('css')
-            ->add('i18n');
+        $filename = 'alltube-' . trim($result->getOutputData()) . '.zip';
 
-        foreach ($finder as $file) {
-            if ($path = $file->getRelativePathname()) {
-                $zipTask->add('vendor/' . $path);
-            }
-        }
+        $this->taskFilesystemStack()
+            ->remove($filename)
+            ->run();
 
-        $zipTask->run();
+        $this->taskGitStack()
+            ->cloneRepo(__DIR__, $tmpDir)
+            ->run();
+
+        $this->taskComposerInstall()
+            ->dir($tmpDir)
+            ->optimizeAutoloader()
+            ->noDev()
+            ->run();
+
+        $this->taskPack($filename)
+            ->addDir('alltube', $tmpDir)
+            ->run();
     }
 }
diff --git a/app.json b/app.json
index 60c06c2..32b2202 100644
--- a/app.json
+++ b/app.json
@@ -19,10 +19,6 @@
     }
   ],
   "env": {
-    "CONVERT": {
-      "description": "Enable audio conversion",
-      "value": "true"
-    },
     "PYTHON": {
       "description": "Path to python binary",
       "value": "/app/.heroku/python/bin/python"
diff --git a/classes/Config.php b/classes/Config.php
index c68d5b3..0460765 100644
--- a/classes/Config.php
+++ b/classes/Config.php
@@ -6,8 +6,12 @@
 
 namespace Alltube;
 
-use Exception;
+use Alltube\Exception\ConfigException;
+use Alltube\Library\Downloader;
 use Jawira\CaseConverter\CaseConverterException;
+use Jean85\PrettyVersions;
+use PackageVersions\Versions;
+use Symfony\Component\ErrorHandler\Debug;
 use Symfony\Component\Yaml\Yaml;
 use Jawira\CaseConverter\Convert;
 
@@ -66,18 +70,18 @@ class Config
     public $convertAdvancedFormats = ['mp3', 'avi', 'flv', 'wav'];
 
     /**
-     * avconv or ffmpeg binary path.
+     * ffmpeg binary path.
      *
      * @var string
      */
-    public $avconv = 'vendor/bin/ffmpeg';
+    public $ffmpeg = '/usr/bin/ffmpeg';
 
     /**
      * Path to the directory that contains the phantomjs binary.
      *
      * @var string
      */
-    public $phantomjsDir = 'vendor/bin/';
+    public $phantomjsDir = '/usr/bin/';
 
     /**
      * Disable URL rewriting.
@@ -108,12 +112,12 @@ class Config
     public $audioBitrate = 128;
 
     /**
-     * avconv/ffmpeg logging level.
+     * ffmpeg logging level.
      * Must be one of these: quiet, panic, fatal, error, warning, info, verbose, debug.
      *
      * @var string
      */
-    public $avconvVerbosity = 'error';
+    public $ffmpegVerbosity = 'error';
 
     /**
      * App name.
@@ -140,7 +144,7 @@ class Config
      * Config constructor.
      *
      * @param mixed[] $options Options
-     * @throws CaseConverterException
+     * @throws ConfigException
      */
     private function __construct(array $options = [])
     {
@@ -151,9 +155,9 @@ class Config
         if (empty($this->genericFormats)) {
             // We don't put this in the class definition so it can be detected by xgettext.
             $this->genericFormats = [
-                'best' => $localeManager->t('Best'),
+                'best/bestvideo' => $localeManager->t('Best'),
                 'bestvideo+bestaudio' => $localeManager->t('Remux best video with best audio'),
-                'worst' => $localeManager->t('Worst'),
+                'worst/worstvideo' => $localeManager->t('Worst'),
             ];
         }
 
@@ -165,46 +169,51 @@ class Config
                 }
             } elseif (!$this->stream) {
                 // Force HTTP if stream is not enabled.
-                $this->replaceGenericFormat($format, $format . '[protocol=https]/' . $format . '[protocol=http]');
+                $keys = array_keys($this->genericFormats);
+                $keys[array_search($format, $keys)] = $this->addHttpToFormat($format);
+                if ($genericFormats = array_combine($keys, $this->genericFormats)) {
+                    $this->genericFormats = $genericFormats;
+                }
             }
         }
     }
 
     /**
-     * Replace a format key.
+     * Add HTTP condition to a format.
      *
-     * @param string $oldFormat Old format
-     * @param string $newFormat New format
+     * @param string $format Format
      *
-     * @return void
+     * @return string
      */
-    private function replaceGenericFormat($oldFormat, $newFormat)
+    public static function addHttpToFormat($format)
     {
-        $keys = array_keys($this->genericFormats);
-        $keys[array_search($oldFormat, $keys)] = $newFormat;
-        if ($genericFormats = array_combine($keys, $this->genericFormats)) {
-            $this->genericFormats = $genericFormats;
+        $newFormat = [];
+        foreach (explode('/', $format) as $subformat) {
+            $newFormat[] = $subformat . '[protocol=https]';
+            $newFormat[] = $subformat . '[protocol=http]';
         }
+
+        return implode('/', $newFormat);
     }
 
     /**
      * Throw an exception if some of the options are invalid.
      *
      * @return void
-     * @throws Exception If Python is missing
-     *
-     * @throws Exception If youtube-dl is missing
+     * @throws ConfigException If Python is missing
+     * @throws ConfigException If youtube-dl is missing
      */
     private function validateOptions()
     {
-        /*
-        We don't translate these exceptions because they usually occur before Slim can catch them
-        so they will go to the logs.
-         */
         if (!is_file($this->youtubedl)) {
-            throw new Exception("Can't find youtube-dl at " . $this->youtubedl);
-        } elseif (!Video::checkCommand([$this->python, '--version'])) {
-            throw new Exception("Can't find Python at " . $this->python);
+            throw new ConfigException("Can't find youtube-dl at " . $this->youtubedl);
+        } elseif (!Downloader::checkCommand([$this->python, '--version'])) {
+            throw new ConfigException("Can't find Python at " . $this->python);
+        }
+
+        if (!class_exists(Debug::class)) {
+            // Dev dependencies are probably not installed.
+            $this->debug = false;
         }
     }
 
@@ -225,18 +234,23 @@ class Config
     }
 
     /**
-     * Override options from environement variables.
+     * Override options from environment variables.
      * Environment variables should use screaming snake case: CONVERT, PYTHON, AUDIO_BITRATE, etc.
      * If the value is an array, you should use the YAML format: "CONVERT_ADVANCED_FORMATS='[foo, bar]'"
      *
      * @return void
-     * @throws CaseConverterException
+     * @throws ConfigException
      */
     private function getEnv()
     {
         foreach (get_object_vars($this) as $prop => $value) {
-            $convert = new Convert($prop);
-            $env = getenv($convert->toMacro());
+            try {
+                $convert = new Convert($prop);
+                $env = getenv($convert->toMacro());
+            } catch (CaseConverterException $e) {
+                // This should not happen.
+                throw new ConfigException('Could not parse option name: ' . $prop, $e->getCode(), $e);
+            }
             if ($env) {
                 $this->$prop = Yaml::parse($env);
             }
@@ -262,7 +276,7 @@ class Config
      *
      * @param string $file Path to the YAML file
      * @return void
-     * @throws Exception
+     * @throws ConfigException
      */
     public static function setFile($file)
     {
@@ -271,7 +285,7 @@ class Config
             self::$instance = new self($options);
             self::$instance->validateOptions();
         } else {
-            throw new Exception("Can't find config file at " . $file);
+            throw new ConfigException("Can't find config file at " . $file);
         }
     }
 
@@ -281,7 +295,7 @@ class Config
      * @param mixed[] $options Options (see `config/config.example.yml` for available options)
      * @param bool $update True to update an existing instance
      * @return void
-     * @throws Exception
+     * @throws ConfigException
      */
     public static function setOptions(array $options, $update = true)
     {
@@ -303,4 +317,31 @@ class Config
     {
         self::$instance = null;
     }
+
+    /**
+     * Return a downloader object with the current config.
+     *
+     * @return Downloader
+     */
+    public function getDownloader()
+    {
+        return new Downloader(
+            $this->youtubedl,
+            $this->params,
+            $this->python,
+            $this->ffmpeg,
+            $this->phantomjsDir,
+            $this->ffmpegVerbosity
+        );
+    }
+
+    /**
+     * @return string
+     */
+    public function getAppVersion()
+    {
+        $version = PrettyVersions::getVersion(Versions::ROOT_PACKAGE_NAME);
+
+        return $version->getPrettyVersion();
+    }
 }
diff --git a/classes/LocaleManager.php b/classes/LocaleManager.php
index 813ea79..df7661c 100644
--- a/classes/LocaleManager.php
+++ b/classes/LocaleManager.php
@@ -7,6 +7,7 @@
 namespace Alltube;
 
 use Aura\Session\Segment;
+use Symfony\Component\Finder\Finder;
 use Symfony\Component\Translation\Translator;
 use Symfony\Component\Translation\Loader\PoFileLoader;
 
@@ -15,12 +16,11 @@ use Symfony\Component\Translation\Loader\PoFileLoader;
  */
 class LocaleManager
 {
+
     /**
-     * Supported locales.
-     *
-     * @var string[]
+     * Path to locales.
      */
-    private $supportedLocales = ['en_US', 'fr_FR', 'zh_CN', 'es_ES', 'pt_BR', 'de_DE', 'ar', 'pl_PL', 'tr_TR'];
+    private const PATH = __DIR__ . '/../i18n/';
 
     /**
      * Current locale.
@@ -75,7 +75,7 @@ class LocaleManager
         foreach ($this->getSupportedLocales() as $locale) {
             $this->translator->addResource(
                 'gettext',
-                __DIR__ . '/../i18n/' . $locale->getIso15897() . '/LC_MESSAGES/Alltube.po',
+                self::PATH . $locale->getIso15897() . '/LC_MESSAGES/Alltube.po',
                 $locale->getIso15897()
             );
         }
@@ -88,10 +88,17 @@ class LocaleManager
      */
     public function getSupportedLocales()
     {
-        $return = [];
+        $return = [
+            new Locale('en_US')
+        ];
 
-        foreach ($this->supportedLocales as $supportedLocale) {
-            $return[] = new Locale($supportedLocale);
+        $finder = new Finder();
+        $finder->depth(0)
+            ->directories()
+            ->in(self::PATH);
+
+        foreach ($finder as $file) {
+            $return[] = new Locale($file->getFilename());
         }
 
         return $return;
diff --git a/classes/UglyRouter.php b/classes/UglyRouter.php
index f03efe7..a5b1020 100644
--- a/classes/UglyRouter.php
+++ b/classes/UglyRouter.php
@@ -48,7 +48,6 @@ class UglyRouter extends Router
      *
      * @return string
      * @throws InvalidArgumentException If required data not provided
-     *
      * @throws RuntimeException         If named route does not exist
      */
     public function pathFor($name, array $data = [], array $queryParams = [])
diff --git a/classes/Video.php b/classes/Video.php
deleted file mode 100644
index f88a088..0000000
--- a/classes/Video.php
+++ /dev/null
@@ -1,647 +0,0 @@
-<?php
-
-/**
- * VideoDownload class.
- */
-
-namespace Alltube;
-
-use Alltube\Exception\EmptyUrlException;
-use Alltube\Exception\PasswordException;
-use Exception;
-use GuzzleHttp\Client;
-use Psr\Http\Message\ResponseInterface;
-use stdClass;
-use Symfony\Component\Process\Process;
-
-/**
- * Extract info about videos.
- *
- * Due to the way youtube-dl behaves, this class can also contain information about a playlist.
- *
- * @property-read string $title         Title
- * @property-read string $protocol      Network protocol (HTTP, RTMP, etc.)
- * @property-read string $url           File URL
- * @property-read string $ext           File extension
- * @property-read string $extractor_key youtube-dl extractor class used
- * @property-read array $entries       List of videos (if the object contains information about a playlist)
- * @property-read array $rtmp_conn
- * @property-read string|null $_type         Object type (usually "playlist" or null)
- * @property-read stdClass $downloader_options
- * @property-read stdClass $http_headers
- */
-class Video
-{
-    /**
-     * Config instance.
-     *
-     * @var Config
-     */
-    private $config;
-
-    /**
-     * URL of the page containing the video.
-     *
-     * @var string
-     */
-    private $webpageUrl;
-
-    /**
-     * Requested video format.
-     *
-     * @var string
-     */
-    private $requestedFormat;
-
-    /**
-     * Password.
-     *
-     * @var string|null
-     */
-    private $password;
-
-    /**
-     * JSON object returned by youtube-dl.
-     *
-     * @var stdClass
-     */
-    private $json;
-
-    /**
-     * URLs of the video files.
-     *
-     * @var string[]
-     */
-    private $urls;
-
-    /**
-     * LocaleManager instance.
-     *
-     * @var LocaleManager
-     */
-    protected $localeManager;
-
-    /**
-     * VideoDownload constructor.
-     *
-     * @param string $webpageUrl URL of the page containing the video
-     * @param string $requestedFormat Requested video format
-     *                                (can be any format string accepted by youtube-dl,
-     *                                including selectors like "[height<=720]")
-     * @param string $password Password
-     */
-    public function __construct($webpageUrl, $requestedFormat = 'best', $password = null)
-    {
-        $this->webpageUrl = $webpageUrl;
-        $this->requestedFormat = $requestedFormat;
-        $this->password = $password;
-        $this->config = Config::getInstance();
-
-        $this->localeManager = LocaleManager::getInstance();
-    }
-
-    /**
-     * Return a youtube-dl process with the specified arguments.
-     *
-     * @param string[] $arguments Arguments
-     *
-     * @return Process<string>
-     */
-    private static function getProcess(array $arguments)
-    {
-        $config = Config::getInstance();
-
-        return new Process(
-            array_merge(
-                [$config->python, $config->youtubedl],
-                $config->params,
-                $arguments
-            )
-        );
-    }
-
-    /**
-     * List all extractors.
-     *
-     * @return string[] Extractors
-     *
-     * @throws PasswordException
-     */
-    public static function getExtractors()
-    {
-        $video = new self('');
-
-        return explode("\n", trim($video->callYoutubedl(['--list-extractors'])));
-    }
-
-    /**
-     * Call youtube-dl.
-     *
-     * @param string[] $arguments Arguments
-     *
-     * @return string Result
-     * @throws Exception         If the password is wrong
-     * @throws Exception         If youtube-dl returns an error
-     *
-     * @throws PasswordException If the video is protected by a password and no password was specified
-     */
-    private function callYoutubedl(array $arguments)
-    {
-        $config = Config::getInstance();
-
-        $process = self::getProcess($arguments);
-        //This is needed by the openload extractor because it runs PhantomJS
-        $process->setEnv(['PATH' => $config->phantomjsDir]);
-        $process->run();
-        if (!$process->isSuccessful()) {
-            $errorOutput = trim($process->getErrorOutput());
-            $exitCode = intval($process->getExitCode());
-            if ($errorOutput == 'ERROR: This video is protected by a password, use the --video-password option') {
-                throw new PasswordException($errorOutput, $exitCode);
-            } elseif (substr($errorOutput, 0, 21) == 'ERROR: Wrong password') {
-                throw new Exception($this->localeManager->t('Wrong password'), $exitCode);
-            } else {
-                throw new Exception($errorOutput, $exitCode);
-            }
-        } else {
-            return trim($process->getOutput());
-        }
-    }
-
-    /**
-     * Get a property from youtube-dl.
-     *
-     * @param string $prop Property
-     *
-     * @return string
-     * @throws PasswordException
-     */
-    private function getProp($prop = 'dump-json')
-    {
-        $arguments = ['--' . $prop];
-
-        if (isset($this->webpageUrl)) {
-            $arguments[] = $this->webpageUrl;
-        }
-        if (isset($this->requestedFormat)) {
-            $arguments[] = '-f';
-            $arguments[] = $this->requestedFormat;
-        }
-        if (isset($this->password)) {
-            $arguments[] = '--video-password';
-            $arguments[] = $this->password;
-        }
-
-        return $this->callYoutubedl($arguments);
-    }
-
-    /**
-     * Get all information about a video.
-     *
-     * @return stdClass Decoded JSON
-     *
-     * @throws PasswordException
-     */
-    public function getJson()
-    {
-        if (!isset($this->json)) {
-            $this->json = json_decode($this->getProp('dump-single-json'));
-        }
-
-        return $this->json;
-    }
-
-    /**
-     * Magic method to get a property from the JSON object returned by youtube-dl.
-     *
-     * @param string $name Property
-     *
-     * @return mixed
-     * @throws PasswordException
-     */
-    public function __get($name)
-    {
-        if (isset($this->$name)) {
-            return $this->getJson()->$name;
-        }
-
-        return null;
-    }
-
-    /**
-     * Magic method to check if the JSON object returned by youtube-dl has a property.
-     *
-     * @param string $name Property
-     *
-     * @return bool
-     * @throws PasswordException
-     */
-    public function __isset($name)
-    {
-        return isset($this->getJson()->$name);
-    }
-
-    /**
-     * Get URL of video from URL of page.
-     *
-     * It generally returns only one URL.
-     * But it can return two URLs when multiple formats are specified
-     * (eg. bestvideo+bestaudio).
-     *
-     * @return string[] URLs of video
-     * @throws EmptyUrlException
-     * @throws PasswordException
-     */
-    public function getUrl()
-    {
-        // Cache the URLs.
-        if (!isset($this->urls)) {
-            $this->urls = explode("\n", $this->getProp('get-url'));
-
-            if (empty($this->urls[0])) {
-                throw new EmptyUrlException($this->localeManager->t('youtube-dl returned an empty URL.'));
-            }
-        }
-
-        return $this->urls;
-    }
-
-    /**
-     * Get filename of video file from URL of page.
-     *
-     * @return string Filename of extracted video
-     *
-     * @throws PasswordException
-     */
-    public function getFilename()
-    {
-        return trim($this->getProp('get-filename'));
-    }
-
-    /**
-     * Get filename of video with the specified extension.
-     *
-     * @param string $extension New file extension
-     *
-     * @return string Filename of extracted video with specified extension
-     * @throws PasswordException
-     */
-    public function getFileNameWithExtension($extension)
-    {
-        return str_replace('.' . $this->ext, '.' . $extension, $this->getFilename());
-    }
-
-    /**
-     * Return arguments used to run rtmp for a specific video.
-     *
-     * @return string[] Arguments
-     */
-    private function getRtmpArguments()
-    {
-        $arguments = [];
-
-        if ($this->protocol == 'rtmp') {
-            foreach (
-                [
-                    'url' => '-rtmp_tcurl',
-                    'webpage_url' => '-rtmp_pageurl',
-                    'player_url' => '-rtmp_swfverify',
-                    'flash_version' => '-rtmp_flashver',
-                    'play_path' => '-rtmp_playpath',
-                    'app' => '-rtmp_app',
-                ] as $property => $option
-            ) {
-                if (isset($this->{$property})) {
-                    $arguments[] = $option;
-                    $arguments[] = $this->{$property};
-                }
-            }
-
-            if (isset($this->rtmp_conn)) {
-                foreach ($this->rtmp_conn as $conn) {
-                    $arguments[] = '-rtmp_conn';
-                    $arguments[] = $conn;
-                }
-            }
-        }
-
-        return $arguments;
-    }
-
-    /**
-     * Check if a command runs successfully.
-     *
-     * @param string[] $command Command and arguments
-     *
-     * @return bool False if the command returns an error, true otherwise
-     */
-    public static function checkCommand(array $command)
-    {
-        $process = new Process($command);
-        $process->run();
-
-        return $process->isSuccessful();
-    }
-
-    /**
-     * Get a process that runs avconv in order to convert a video.
-     *
-     * @param int $audioBitrate Audio bitrate of the converted file
-     * @param string $filetype Filetype of the converted file
-     * @param bool $audioOnly True to return an audio-only file
-     * @param string $from Start the conversion at this time
-     * @param string $to End the conversion at this time
-     *
-     * @return Process<string> Process
-     * @throws Exception If avconv/ffmpeg is missing
-     *
-     */
-    private function getAvconvProcess(
-        $audioBitrate,
-        $filetype = 'mp3',
-        $audioOnly = true,
-        $from = null,
-        $to = null
-    ) {
-        if (!$this->checkCommand([$this->config->avconv, '-version'])) {
-            throw new Exception(
-                $this->localeManager->t(
-                    "Can't find avconv or ffmpeg at @path.",
-                    ['@path' => $this->config->avconv]
-                )
-            );
-        }
-
-        $durationRegex = '/(\d+:)?(\d+:)?(\d+)/';
-
-        $afterArguments = [];
-
-        if ($audioOnly) {
-            $afterArguments[] = '-vn';
-        }
-
-        if (!empty($from)) {
-            if (!preg_match($durationRegex, $from)) {
-                throw new Exception($this->localeManager->t('Invalid start time: @from.', ['@from' => $from]));
-            }
-            $afterArguments[] = '-ss';
-            $afterArguments[] = $from;
-        }
-        if (!empty($to)) {
-            if (!preg_match($durationRegex, $to)) {
-                throw new Exception($this->localeManager->t('Invalid end time: @to.', ['@to' => $to]));
-            }
-            $afterArguments[] = '-to';
-            $afterArguments[] = $to;
-        }
-
-        $urls = $this->getUrl();
-
-        $arguments = array_merge(
-            [
-                $this->config->avconv,
-                '-v', $this->config->avconvVerbosity,
-            ],
-            $this->getRtmpArguments(),
-            [
-                '-i', $urls[0],
-                '-f', $filetype,
-                '-b:a', $audioBitrate . 'k',
-            ],
-            $afterArguments,
-            [
-                'pipe:1',
-            ]
-        );
-
-        //Vimeo needs a correct user-agent
-        $arguments[] = '-user_agent';
-        $arguments[] = $this->getProp('dump-user-agent');
-
-        return new Process($arguments);
-    }
-
-    /**
-     * Get audio stream of converted video.
-     *
-     * @param string $from Start the conversion at this time
-     * @param string $to End the conversion at this time
-     *
-     * @return resource popen stream
-     * @throws Exception If the popen stream was not created correctly
-     *
-     * @throws Exception If your try to convert an M3U8 video
-     */
-    public function getAudioStream($from = null, $to = null)
-    {
-        if (isset($this->_type) && $this->_type == 'playlist') {
-            throw new Exception($this->localeManager->t('Conversion of playlists is not supported.'));
-        }
-
-        if (isset($this->protocol)) {
-            if (in_array($this->protocol, ['m3u8', 'm3u8_native'])) {
-                throw new Exception($this->localeManager->t('Conversion of M3U8 files is not supported.'));
-            } elseif ($this->protocol == 'http_dash_segments') {
-                throw new Exception($this->localeManager->t('Conversion of DASH segments is not supported.'));
-            }
-        }
-
-        $avconvProc = $this->getAvconvProcess($this->config->audioBitrate, 'mp3', true, $from, $to);
-
-        $stream = popen($avconvProc->getCommandLine(), 'r');
-
-        if (!is_resource($stream)) {
-            throw new Exception($this->localeManager->t('Could not open popen stream.'));
-        }
-
-        return $stream;
-    }
-
-    /**
-     * Get video stream from an M3U playlist.
-     *
-     * @return resource popen stream
-     * @throws Exception If the popen stream was not created correctly
-     *
-     * @throws Exception If avconv/ffmpeg is missing
-     */
-    public function getM3uStream()
-    {
-        if (!$this->checkCommand([$this->config->avconv, '-version'])) {
-            throw new Exception(
-                $this->localeManager->t(
-                    "Can't find avconv or ffmpeg at @path.",
-                    ['@path' => $this->config->avconv]
-                )
-            );
-        }
-
-        $urls = $this->getUrl();
-
-        $process = new Process(
-            [
-                $this->config->avconv,
-                '-v', $this->config->avconvVerbosity,
-                '-i', $urls[0],
-                '-f', $this->ext,
-                '-c', 'copy',
-                '-bsf:a', 'aac_adtstoasc',
-                '-movflags', 'frag_keyframe+empty_moov',
-                'pipe:1',
-            ]
-        );
-
-        $stream = popen($process->getCommandLine(), 'r');
-        if (!is_resource($stream)) {
-            throw new Exception($this->localeManager->t('Could not open popen stream.'));
-        }
-
-        return $stream;
-    }
-
-    /**
-     * Get an avconv stream to remux audio and video.
-     *
-     * @return resource popen stream
-     * @throws Exception If the popen stream was not created correctly
-     *
-     */
-    public function getRemuxStream()
-    {
-        $urls = $this->getUrl();
-
-        if (!isset($urls[0]) || !isset($urls[1])) {
-            throw new Exception($this->localeManager->t('This video does not have two URLs.'));
-        }
-
-        $process = new Process(
-            [
-                $this->config->avconv,
-                '-v', $this->config->avconvVerbosity,
-                '-i', $urls[0],
-                '-i', $urls[1],
-                '-c', 'copy',
-                '-map', '0:v:0',
-                '-map', '1:a:0',
-                '-f', 'matroska',
-                'pipe:1',
-            ]
-        );
-
-        $stream = popen($process->getCommandLine(), 'r');
-        if (!is_resource($stream)) {
-            throw new Exception($this->localeManager->t('Could not open popen stream.'));
-        }
-
-        return $stream;
-    }
-
-    /**
-     * Get video stream from an RTMP video.
-     *
-     * @return resource popen stream
-     * @throws Exception If the popen stream was not created correctly
-     *
-     */
-    public function getRtmpStream()
-    {
-        $urls = $this->getUrl();
-
-        $process = new Process(
-            array_merge(
-                [
-                    $this->config->avconv,
-                    '-v', $this->config->avconvVerbosity,
-                ],
-                $this->getRtmpArguments(),
-                [
-                    '-i', $urls[0],
-                    '-f', $this->ext,
-                    'pipe:1',
-                ]
-            )
-        );
-        $stream = popen($process->getCommandLine(), 'r');
-        if (!is_resource($stream)) {
-            throw new Exception($this->localeManager->t('Could not open popen stream.'));
-        }
-
-        return $stream;
-    }
-
-    /**
-     * Get the stream of a converted video.
-     *
-     * @param int $audioBitrate Audio bitrate of the converted file
-     * @param string $filetype Filetype of the converted file
-     *
-     * @return resource popen stream
-     * @throws Exception If the popen stream was not created correctly
-     *
-     * @throws Exception If your try to convert and M3U8 video
-     */
-    public function getConvertedStream($audioBitrate, $filetype)
-    {
-        if (in_array($this->protocol, ['m3u8', 'm3u8_native'])) {
-            throw new Exception($this->localeManager->t('Conversion of M3U8 files is not supported.'));
-        }
-
-        $avconvProc = $this->getAvconvProcess($audioBitrate, $filetype, false);
-
-        $stream = popen($avconvProc->getCommandLine(), 'r');
-
-        if (!is_resource($stream)) {
-            throw new Exception($this->localeManager->t('Could not open popen stream.'));
-        }
-
-        return $stream;
-    }
-
-    /**
-     * Get the same video but with another format.
-     *
-     * @param string $format New format
-     *
-     * @return Video
-     */
-    public function withFormat($format)
-    {
-        return new self($this->webpageUrl, $format, $this->password);
-    }
-
-    /**
-     * Get a HTTP response containing the video.
-     *
-     * @param mixed[] $headers HTTP headers of the request
-     *
-     * @return ResponseInterface
-     * @throws EmptyUrlException
-     * @throws PasswordException
-     * @link https://github.com/guzzle/guzzle/issues/2640
-     */
-    public function getHttpResponse(array $headers = [])
-    {
-        // IDN conversion breaks with Google hosts like https://r3---sn-25glene6.googlevideo.com/.
-        $client = new Client(['idn_conversion' => false]);
-        $urls = $this->getUrl();
-        $stream_context_options = [];
-
-        if (array_key_exists('Referer', (array)$this->http_headers)) {
-            $stream_context_options = [
-                'http' => [
-                    'header' => 'Referer: ' . $this->http_headers->Referer
-                ]
-            ];
-        }
-
-        return $client->request(
-            'GET',
-            $urls[0],
-            [
-                'stream' => true,
-                'stream_context' => $stream_context_options,
-                'headers' => array_merge((array)$this->http_headers, $headers)
-            ]
-        );
-    }
-}
diff --git a/classes/exceptions/ConfigException.php b/classes/exceptions/ConfigException.php
new file mode 100644
index 0000000..f533b35
--- /dev/null
+++ b/classes/exceptions/ConfigException.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace Alltube\Exception;
+
+use Exception;
+
+class ConfigException extends Exception
+{
+
+}
diff --git a/classes/exceptions/EmptyUrlException.php b/classes/exceptions/EmptyUrlException.php
deleted file mode 100644
index a1ba771..0000000
--- a/classes/exceptions/EmptyUrlException.php
+++ /dev/null
@@ -1,16 +0,0 @@
-<?php
-
-/**
- * EmptyUrlException class.
- */
-
-namespace Alltube\Exception;
-
-use Exception;
-
-/**
- * Exception thrown when youtube-dl returns an empty URL.
- */
-class EmptyUrlException extends Exception
-{
-}
diff --git a/classes/exceptions/PasswordException.php b/classes/exceptions/PasswordException.php
deleted file mode 100644
index 662aa3b..0000000
--- a/classes/exceptions/PasswordException.php
+++ /dev/null
@@ -1,16 +0,0 @@
-<?php
-
-/**
- * PasswordException class.
- */
-
-namespace Alltube\Exception;
-
-use Exception;
-
-/**
- * Exception thrown when a video requires a password.
- */
-class PasswordException extends Exception
-{
-}
diff --git a/classes/streams/ConvertedPlaylistArchiveStream.php b/classes/streams/ConvertedPlaylistArchiveStream.php
index c336663..c4114ea 100644
--- a/classes/streams/ConvertedPlaylistArchiveStream.php
+++ b/classes/streams/ConvertedPlaylistArchiveStream.php
@@ -6,8 +6,8 @@
 
 namespace Alltube\Stream;
 
-use Alltube\Video;
-use Exception;
+use Alltube\Library\Exception\AlltubeLibraryException;
+use Alltube\Library\Video;
 use Slim\Http\Stream;
 
 /**
@@ -21,11 +21,11 @@ class ConvertedPlaylistArchiveStream extends PlaylistArchiveStream
      * @param Video $video Video to stream
      *
      * @return void
-     * @throws Exception
+     * @throws AlltubeLibraryException
      */
     protected function startVideoStream(Video $video)
     {
-        $this->curVideoStream = new Stream($video->getAudioStream());
+        $this->curVideoStream = new Stream($this->downloader->getAudioStream($video));
 
         $this->init_file_stream_transfer(
             $video->getFileNameWithExtension('mp3'),
diff --git a/classes/streams/PlaylistArchiveStream.php b/classes/streams/PlaylistArchiveStream.php
index 2e682fb..d55e554 100644
--- a/classes/streams/PlaylistArchiveStream.php
+++ b/classes/streams/PlaylistArchiveStream.php
@@ -6,9 +6,9 @@
 
 namespace Alltube\Stream;
 
-use Alltube\Exception\EmptyUrlException;
-use Alltube\Exception\PasswordException;
-use Alltube\Video;
+use Alltube\Library\Downloader;
+use Alltube\Library\Exception\AlltubeLibraryException;
+use Alltube\Library\Video;
 use Barracuda\ArchiveStream\ZipArchive;
 use Psr\Http\Message\StreamInterface;
 
@@ -47,22 +47,32 @@ class PlaylistArchiveStream extends ZipArchive implements StreamInterface
      */
     private $isComplete = false;
 
+    /**
+     * Downloader object.
+     *
+     * @var Downloader
+     */
+    protected $downloader;
+
     /**
      * PlaylistArchiveStream constructor.
      *
      * We don't call the parent constructor because it messes up the output buffering.
      *
+     * @param Downloader $downloader Downloader object
      * @param Video $video Video/playlist to download
      * @noinspection PhpMissingParentConstructorInspection
      */
-    public function __construct(Video $video)
+    public function __construct(Downloader $downloader, Video $video)
     {
+        $this->downloader = $downloader;
+
         $buffer = fopen('php://temp', 'r+');
         if ($buffer !== false) {
             $this->buffer = $buffer;
         }
         foreach ($video->entries as $entry) {
-            $this->videos[] = new Video($entry->url);
+            $this->videos[] = $downloader->getVideo($entry->url);
         }
     }
 
@@ -244,12 +254,11 @@ class PlaylistArchiveStream extends ZipArchive implements StreamInterface
      * @param Video $video Video to stream
      *
      * @return void
-     * @throws PasswordException
-     * @throws EmptyUrlException
+     * @throws AlltubeLibraryException
      */
     protected function startVideoStream(Video $video)
     {
-        $response = $video->getHttpResponse();
+        $response = $this->downloader->getHttpResponse($video);
 
         $this->curVideoStream = $response->getBody();
         $contentLengthHeaders = $response->getHeader('Content-Length');
@@ -266,8 +275,7 @@ class PlaylistArchiveStream extends ZipArchive implements StreamInterface
      * @param int $count Number of bytes to read
      *
      * @return string|false
-     * @throws EmptyUrlException
-     * @throws PasswordException
+     * @throws AlltubeLibraryException
      */
     public function read($count)
     {
diff --git a/classes/streams/YoutubeStream.php b/classes/streams/YoutubeStream.php
index 3995d11..fdd19dd 100644
--- a/classes/streams/YoutubeStream.php
+++ b/classes/streams/YoutubeStream.php
@@ -6,9 +6,9 @@
 
 namespace Alltube\Stream;
 
-use Alltube\Exception\EmptyUrlException;
-use Alltube\Exception\PasswordException;
-use Alltube\Video;
+use Alltube\Library\Downloader;
+use Alltube\Library\Exception\AlltubeLibraryException;
+use Alltube\Library\Video;
 use GuzzleHttp\Psr7\AppendStream;
 
 /**
@@ -20,15 +20,15 @@ class YoutubeStream extends AppendStream
     /**
      * YoutubeStream constructor.
      *
+     * @param Downloader $downloader Downloader object
      * @param Video $video Video to stream
-     * @throws EmptyUrlException
-     * @throws PasswordException
+     * @throws AlltubeLibraryException
      */
-    public function __construct(Video $video)
+    public function __construct(Downloader $downloader, Video $video)
     {
         parent::__construct();
 
-        $stream = $video->getHttpResponse();
+        $stream = $downloader->getHttpResponse($video);
         $contentLenghtHeader = $stream->getHeader('Content-Length');
         $rangeStart = 0;
 
@@ -37,7 +37,7 @@ class YoutubeStream extends AppendStream
             if ($rangeEnd >= $contentLenghtHeader[0]) {
                 $rangeEnd = intval($contentLenghtHeader[0]) - 1;
             }
-            $response = $video->getHttpResponse(['Range' => 'bytes=' . $rangeStart . '-' . $rangeEnd]);
+            $response = $downloader->getHttpResponse($video, ['Range' => 'bytes=' . $rangeStart . '-' . $rangeEnd]);
             $this->addStream(new YoutubeChunkStream($response));
             $rangeStart = $rangeEnd + 1;
         }
diff --git a/composer.json b/composer.json
index 0bd4fc6..df69396 100644
--- a/composer.json
+++ b/composer.json
@@ -9,21 +9,20 @@
     "ext-json": "*",
     "aura/session": "^2.1",
     "barracudanetworks/archivestream-php": "^1.0",
-    "guzzlehttp/guzzle": "^6.5",
     "jawira/case-converter": "^3.4",
+    "jean85/pretty-package-versions": "^1.3",
     "mathmarques/smarty-view": "^1.1",
     "npm-asset/open-sans-fontface": "^1.4",
     "rinvex/countries": "^6.1",
-    "symfony/process": "^4.0",
+    "rudloff/alltube-library": "^0.1.0",
+    "symfony/finder": "^5.0",
     "symfony/translation": "^4.0",
     "symfony/yaml": "^4.0",
+    "ytdl-org/youtube-dl": "^2020.06",
     "zonuexe/http-accept-language": "^0.4.1"
   },
   "require-dev": {
-    "anam/phantomjs-linux-x86-binary": "^2.1",
-    "consolidation/robo": "^2.0",
-    "ffmpeg/ffmpeg": "^4.1",
-    "heroku/heroku-buildpack-php": "^162.0",
+    "consolidation/robo": "^2.1",
     "php-mock/php-mock-mockery": "^1.3",
     "phpro/grumphp": "^0.18.0",
     "phpstan/phpstan": "^0.12.25",
@@ -32,15 +31,7 @@
     "smarty-gettext/smarty-gettext": "^1.6",
     "squizlabs/php_codesniffer": "^3.5",
     "symfony/error-handler": "^5.0",
-    "symfony/var-dumper": "^5.0",
-    "ytdl-org/youtube-dl": "^2020.05"
-  },
-  "extra": {
-    "paas": {
-      "nginx-includes": [
-        "resources/nginx.conf"
-      ]
-    }
+    "symfony/var-dumper": "^5.0"
   },
   "repositories": [
     {
@@ -51,26 +42,12 @@
       "type": "package",
       "package": {
         "name": "ytdl-org/youtube-dl",
-        "version": "2020.05.08",
+        "version": "2020.06.16.1",
         "dist": {
           "type": "zip",
-          "url": "https://github.com/ytdl-org/youtube-dl/archive/2020.05.08.zip"
+          "url": "https://github.com/ytdl-org/youtube-dl/archive/2020.06.16.1.zip"
         }
       }
-    },
-    {
-      "type": "package",
-      "package": {
-        "name": "ffmpeg/ffmpeg",
-        "version": "4.1.4",
-        "dist": {
-          "url": "https://www.johnvansickle.com/ffmpeg/old-releases/ffmpeg-4.1.4-amd64-static.tar.xz",
-          "type": "xz"
-        },
-        "bin": [
-          "ffmpeg"
-        ]
-      }
     }
   ],
   "authors": [
@@ -97,10 +74,9 @@
     }
   },
   "scripts": {
-    "compile": "composer install --ignore-platform-reqs",
     "lint": "grumphp run --ansi",
     "test": "phpunit",
-    "release": "robo release",
+    "release": "robo release --ansi",
     "update-locales": [
       "tsmarty2c.php templates > i18n/template.pot",
       "xgettext --omit-header -kt -j -o i18n/template.pot classes/*.php classes/*/*.php controllers/*"
diff --git a/composer.lock b/composer.lock
index 15ca205..44749d8 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "5fdb499464d2fcf04d97dca8c099a075",
+    "content-hash": "3c17df3876a2c769f866f845e4491763",
     "packages": [
         {
             "name": "aura/session",
@@ -109,17 +109,72 @@
             "time": "2018-08-10T13:58:33+00:00"
         },
         {
-            "name": "guzzlehttp/guzzle",
-            "version": "6.5.3",
+            "name": "composer/package-versions-deprecated",
+            "version": "1.8.1",
             "source": {
                 "type": "git",
-                "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "aab4ebd862aa7d04f01a4b51849d657db56d882e"
+                "url": "https://github.com/composer/package-versions-deprecated.git",
+                "reference": "b9805885293f3957ee0dd42616ac6915c4ac9a4b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/aab4ebd862aa7d04f01a4b51849d657db56d882e",
-                "reference": "aab4ebd862aa7d04f01a4b51849d657db56d882e",
+                "url": "https://api.github.com/repos/composer/package-versions-deprecated/zipball/b9805885293f3957ee0dd42616ac6915c4ac9a4b",
+                "reference": "b9805885293f3957ee0dd42616ac6915c4ac9a4b",
+                "shasum": ""
+            },
+            "require": {
+                "composer-plugin-api": "^1.1.0 || ^2.0",
+                "php": "^7"
+            },
+            "replace": {
+                "ocramius/package-versions": "1.8.99"
+            },
+            "require-dev": {
+                "composer/composer": "^1.9.3 || ^2.0@dev",
+                "ext-zip": "^1.13",
+                "phpunit/phpunit": "^6.5 || ^7"
+            },
+            "type": "composer-plugin",
+            "extra": {
+                "class": "PackageVersions\\Installer",
+                "branch-alias": {
+                    "dev-master": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "PackageVersions\\": "src/PackageVersions"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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@@ -355,6 +410,57 @@
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-                "php-coveralls/php-coveralls": "^1",
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+                "squizlabs/php_codesniffer": "^3"
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                     "symfony4": {
-                        "require": {
-                            "symfony/console": "^4.0"
+                        "require-dev": {
+                            "symfony/console": "^4"
                         },
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                         }
-                    },
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-                    "dev-master": "1.x-dev"
+                    "dev-master": "2.x-dev"
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@@ -1643,41 +1775,53 @@
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-            "time": "2019-01-01T17:30:51+00:00"
+            "time": "2020-05-27T17:06:13+00:00"
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+            "version": "4.1.1",
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                 "url": "https://github.com/consolidation/output-formatters.git",
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+                "php": ">=7.1.3",
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-                "phpunit/phpunit": "^5.7.27",
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+                "phpunit/phpunit": "^6",
+                "squizlabs/php_codesniffer": "^3",
                 "symfony/var-dumper": "^4",
-                "victorjonsson/markdowndocs": "^1.3"
+                "symfony/yaml": "^4"
             },
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                 "symfony/var-dumper": "For using the var_dump formatter"
             },
             "type": "library",
             "extra": {
+                "scenarios": {
+                    "symfony4": {
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@@ -1698,54 +1842,49 @@
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-            "time": "2019-10-29T13:39:04+00:00"
+            "time": "2020-05-27T20:51:17+00:00"
         },
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-            "version": "2.0.0",
+            "version": "2.1.0",
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                 "url": "https://github.com/consolidation/Robo.git",
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-                "consolidation/output-formatters": "^4",
-                "consolidation/self-update": "^1",
+                "consolidation/annotated-command": "^4.1.1",
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-                "symfony/filesystem": "^4",
-                "symfony/finder": "^4",
-                "symfony/process": "^4"
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                 "patchwork/jsqueeze": "^2",
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-                "php-coveralls/php-coveralls": "^1",
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-                "squizlabs/php_codesniffer": "^2.8"
+                "phpunit/phpunit": "^6.5.14",
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             "suggest": {
                 "henrikbjorn/lurker": "For monitoring filesystem changes in taskWatch",
@@ -1758,6 +1897,27 @@
             ],
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+                "scenarios": {
+                    "symfony4": {
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+                            "symfony/filesystem": "^4.4.8",
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+                            "symfony/process": "^4.4.8",
+                            "phpunit/phpunit": "^6",
+                            "nikic/php-parser": "^2"
+                        },
+                        "remove": [
+                            "codeception/phpunit-wrapper"
+                        ],
+                        "config": {
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+                                "php": "7.1.3"
+                            }
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+                },
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@@ -1778,26 +1938,26 @@
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-            "time": "2019-10-29T14:11:02+00:00"
+            "time": "2020-05-27T22:03:57+00:00"
         },
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-            "version": "1.1.5",
+            "version": "1.2.0",
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                 "url": "https://github.com/consolidation/self-update.git",
-                "reference": "a1c273b14ce334789825a09d06d4c87c0a02ad54"
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-                "symfony/filesystem": "^2.5|^3|^4"
+                "symfony/console": "^2.8|^3|^4|^5",
+                "symfony/filesystem": "^2.5|^3|^4|^5"
             },
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                 "scripts/release"
@@ -1818,17 +1978,17 @@
                 "MIT"
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-                    "name": "Greg Anderson",
-                    "email": "greg.1.anderson@greenknowe.org"
-                },
                 {
                     "name": "Alexander Menk",
                     "email": "menk@mestrona.net"
+                },
+                {
+                    "name": "Greg Anderson",
+                    "email": "greg.1.anderson@greenknowe.org"
                 }
             ],
             "description": "Provides a self:update command for Symfony Console applications.",
-            "time": "2018-10-28T01:52:03+00:00"
+            "time": "2020-04-13T02:49:20+00:00"
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@@ -2047,18 +2207,6 @@
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@@ -2258,50 +2406,6 @@
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-                "bin/heroku-hhvm-nginx",
-                "bin/heroku-php-apache2",
-                "bin/heroku-php-nginx"
-            ],
-            "type": "library",
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
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-                    "name": "David Zuelke",
-                    "email": "dz@heroku.com"
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-            "description": "Toolkit for starting a PHP application locally, with or without foreman, using the same config for PHP/HHVM and Apache2/Nginx as on Heroku",
-            "homepage": "https://github.com/heroku/heroku-buildpack-php",
-            "keywords": [
-                "apache",
-                "apache2",
-                "foreman",
-                "heroku",
-                "hhvm",
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@@ -3511,20 +3615,20 @@
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-            "version": "v0.18.0",
+            "version": "v0.18.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpro/grumphp.git",
-                "reference": "b3d80bbcbac8068f21ea5f5da18a4af01d2d471d"
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-                "reference": "b3d80bbcbac8068f21ea5f5da18a4af01d2d471d",
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             },
             "require": {
-                "composer-plugin-api": "~1.0",
+                "composer-plugin-api": "~1.0 || ~2.0",
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                 "ext-json": "*",
                 "gitonomy/gitlib": "^1.0.3",
@@ -3542,10 +3646,9 @@
                 "symfony/yaml": "~3.4 || ~4.0 || ~5.0"
             },
             "require-dev": {
-                "brianium/paratest": "~3.1",
-                "composer/composer": "~1.9",
+                "brianium/paratest": "~3.1 || dev-master",
+                "composer/composer": "~1.9 || ^2.0@dev",
                 "ergebnis/composer-normalize": "~2.1",
-                "friendsofphp/php-cs-fixer": "~2.16",
                 "jakub-onderka/php-parallel-lint": "~1.0",
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@@ -3612,7 +3715,7 @@
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-            "time": "2020-02-25T17:51:17+00:00"
+            "time": "2020-05-27T04:48:38+00:00"
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             "name": "phpspec/prophecy",
@@ -4099,6 +4202,52 @@
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             "time": "2019-11-06T09:42:23+00:00"
         },
+        {
+            "name": "psr/event-dispatcher",
+            "version": "1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-fig/event-dispatcher.git",
+                "reference": "dbefd12671e8a14ec7f180cab83036ed26714bb0"
+            },
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+                "reference": "dbefd12671e8a14ec7f180cab83036ed26714bb0",
+                "shasum": ""
+            },
+            "require": {
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+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Psr\\EventDispatcher\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "PHP-FIG",
+                    "homepage": "http://www.php-fig.org/"
+                }
+            ],
+            "description": "Standard interfaces for event handling.",
+            "keywords": [
+                "events",
+                "psr",
+                "psr-14"
+            ],
+            "time": "2019-01-08T18:20:26+00:00"
+        },
         {
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@@ -4152,12 +4301,12 @@
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                 "url": "https://github.com/Roave/SecurityAdvisories.git",
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@@ -4166,12 +4315,14 @@
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                 "amphp/http": "<1.0.1",
+                "amphp/http-client": ">=4,<4.4",
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                 "bagisto/bagisto": "<0.1.5",
-                "barrelstrength/sprout-base-email": "<3.9",
-                "bolt/bolt": "<3.6.10",
+                "barrelstrength/sprout-base-email": "<1.2.7",
+                "barrelstrength/sprout-forms": "<3.9",
+                "bolt/bolt": "<3.7.1",
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@@ -4197,10 +4348,10 @@
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-                "dolibarr/dolibarr": "<=10.0.6",
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                 "ezsystems/ezplatform-admin-ui-assets": ">=4,<4.2",
+                "ezsystems/ezplatform-kernel": ">=1,<1.0.2.1",
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@@ -4249,6 +4401,7 @@
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                 "nzo/url-encryptor-bundle": ">=4,<4.3.2|>=5,<5.0.1",
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@@ -4260,7 +4413,8 @@
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                 "pear/archive_tar": "<1.4.4",
                 "phpfastcache/phpfastcache": ">=5,<5.0.13",
-                "phpmailer/phpmailer": ">=5,<5.2.27|>=6,<6.0.6",
+                "phpmailer/phpmailer": "<6.1.6",
+                "phpmussel/phpmussel": ">=1,<1.6",
                 "phpmyadmin/phpmyadmin": "<4.9.2",
                 "phpoffice/phpexcel": "<1.8.2",
                 "phpoffice/phpspreadsheet": "<1.8",
@@ -4275,6 +4429,7 @@
                 "propel/propel": ">=2-alpha.1,<=2-alpha.7",
                 "propel/propel1": ">=1,<=1.7.1",
                 "pusher/pusher-php-server": "<2.2.1",
+                "rainlab/debugbar-plugin": "<3.1",
                 "robrichards/xmlseclibs": "<3.0.4",
                 "sabre/dav": ">=1.6,<1.6.99|>=1.7,<1.7.11|>=1.8,<1.8.9",
                 "scheb/two-factor-bundle": ">=0,<3.26|>=4,<4.11",
@@ -4341,6 +4496,7 @@
                 "symfony/var-exporter": ">=4.2,<4.2.12|>=4.3,<4.3.8",
                 "symfony/web-profiler-bundle": ">=2,<2.3.19|>=2.4,<2.4.9|>=2.5,<2.5.4",
                 "symfony/yaml": ">=2,<2.0.22|>=2.1,<2.1.7",
+                "t3g/svg-sanitizer": "<1.0.3",
                 "tecnickcom/tcpdf": "<6.2.22",
                 "thelia/backoffice-default-template": ">=2.1,<2.1.2",
                 "thelia/thelia": ">=2.1-beta.1,<2.1.3",
@@ -4412,7 +4568,7 @@
                 }
             ],
             "description": "Prevents installation of composer packages with known security vulnerabilities: no API, simply require it",
-            "time": "2020-05-12T11:18:47+00:00"
+            "time": "2020-06-19T13:23:43+00:00"
         },
         {
             "name": "sebastian/code-unit-reverse-lookup",
@@ -5250,41 +5406,41 @@
         },
         {
             "name": "symfony/console",
-            "version": "v4.4.0",
+            "version": "v5.0.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/console.git",
-                "reference": "35d9077f495c6d184d9930f7a7ecbd1ad13c7ab8"
+                "reference": "5fa1caadc8cdaa17bcfb25219f3b53fe294a9935"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/console/zipball/35d9077f495c6d184d9930f7a7ecbd1ad13c7ab8",
-                "reference": "35d9077f495c6d184d9930f7a7ecbd1ad13c7ab8",
+                "url": "https://api.github.com/repos/symfony/console/zipball/5fa1caadc8cdaa17bcfb25219f3b53fe294a9935",
+                "reference": "5fa1caadc8cdaa17bcfb25219f3b53fe294a9935",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1.3",
+                "php": "^7.2.5",
                 "symfony/polyfill-mbstring": "~1.0",
                 "symfony/polyfill-php73": "^1.8",
                 "symfony/service-contracts": "^1.1|^2"
             },
             "conflict": {
-                "symfony/dependency-injection": "<3.4",
-                "symfony/event-dispatcher": "<4.3|>=5",
+                "symfony/dependency-injection": "<4.4",
+                "symfony/event-dispatcher": "<4.4",
                 "symfony/lock": "<4.4",
-                "symfony/process": "<3.3"
+                "symfony/process": "<4.4"
             },
             "provide": {
                 "psr/log-implementation": "1.0"
             },
             "require-dev": {
                 "psr/log": "~1.0",
-                "symfony/config": "^3.4|^4.0|^5.0",
-                "symfony/dependency-injection": "^3.4|^4.0|^5.0",
-                "symfony/event-dispatcher": "^4.3",
+                "symfony/config": "^4.4|^5.0",
+                "symfony/dependency-injection": "^4.4|^5.0",
+                "symfony/event-dispatcher": "^4.4|^5.0",
                 "symfony/lock": "^4.4|^5.0",
-                "symfony/process": "^3.4|^4.0|^5.0",
-                "symfony/var-dumper": "^4.3|^5.0"
+                "symfony/process": "^4.4|^5.0",
+                "symfony/var-dumper": "^4.4|^5.0"
             },
             "suggest": {
                 "psr/log": "For using the console logger",
@@ -5295,7 +5451,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.4-dev"
+                    "dev-master": "5.0-dev"
                 }
             },
             "autoload": {
@@ -5322,7 +5478,7 @@
             ],
             "description": "Symfony Console Component",
             "homepage": "https://symfony.com",
-            "time": "2019-11-13T07:39:40+00:00"
+            "time": "2020-03-30T11:42:42+00:00"
         },
         {
             "name": "symfony/dependency-injection",
@@ -5454,37 +5610,37 @@
         },
         {
             "name": "symfony/event-dispatcher",
-            "version": "v4.4.0",
+            "version": "v5.0.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/event-dispatcher.git",
-                "reference": "ab1c43e17fff802bef0a898f3bc088ac33b8e0e1"
+                "reference": "24f40d95385774ed5c71dbf014edd047e2f2f3dc"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/event-dispatcher/zipball/ab1c43e17fff802bef0a898f3bc088ac33b8e0e1",
-                "reference": "ab1c43e17fff802bef0a898f3bc088ac33b8e0e1",
+                "url": "https://api.github.com/repos/symfony/event-dispatcher/zipball/24f40d95385774ed5c71dbf014edd047e2f2f3dc",
+                "reference": "24f40d95385774ed5c71dbf014edd047e2f2f3dc",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1.3",
-                "symfony/event-dispatcher-contracts": "^1.1"
+                "php": "^7.2.5",
+                "symfony/event-dispatcher-contracts": "^2"
             },
             "conflict": {
-                "symfony/dependency-injection": "<3.4"
+                "symfony/dependency-injection": "<4.4"
             },
             "provide": {
                 "psr/event-dispatcher-implementation": "1.0",
-                "symfony/event-dispatcher-implementation": "1.1"
+                "symfony/event-dispatcher-implementation": "2.0"
             },
             "require-dev": {
                 "psr/log": "~1.0",
-                "symfony/config": "^3.4|^4.0|^5.0",
-                "symfony/dependency-injection": "^3.4|^4.0|^5.0",
-                "symfony/expression-language": "^3.4|^4.0|^5.0",
-                "symfony/http-foundation": "^3.4|^4.0|^5.0",
+                "symfony/config": "^4.4|^5.0",
+                "symfony/dependency-injection": "^4.4|^5.0",
+                "symfony/expression-language": "^4.4|^5.0",
+                "symfony/http-foundation": "^4.4|^5.0",
                 "symfony/service-contracts": "^1.1|^2",
-                "symfony/stopwatch": "^3.4|^4.0|^5.0"
+                "symfony/stopwatch": "^4.4|^5.0"
             },
             "suggest": {
                 "symfony/dependency-injection": "",
@@ -5493,7 +5649,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.4-dev"
+                    "dev-master": "5.0-dev"
                 }
             },
             "autoload": {
@@ -5520,33 +5676,33 @@
             ],
             "description": "Symfony EventDispatcher Component",
             "homepage": "https://symfony.com",
-            "time": "2019-11-08T22:40:51+00:00"
+            "time": "2020-03-27T16:56:45+00:00"
         },
         {
             "name": "symfony/event-dispatcher-contracts",
-            "version": "v1.1.7",
+            "version": "v2.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/event-dispatcher-contracts.git",
-                "reference": "c43ab685673fb6c8d84220c77897b1d6cdbe1d18"
+                "reference": "af23c2584d4577d54661c434446fb8fbed6025dd"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/event-dispatcher-contracts/zipball/c43ab685673fb6c8d84220c77897b1d6cdbe1d18",
-                "reference": "c43ab685673fb6c8d84220c77897b1d6cdbe1d18",
+                "url": "https://api.github.com/repos/symfony/event-dispatcher-contracts/zipball/af23c2584d4577d54661c434446fb8fbed6025dd",
+                "reference": "af23c2584d4577d54661c434446fb8fbed6025dd",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1.3"
+                "php": "^7.2.5",
+                "psr/event-dispatcher": "^1"
             },
             "suggest": {
-                "psr/event-dispatcher": "",
                 "symfony/event-dispatcher-implementation": ""
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.1-dev"
+                    "dev-master": "2.0-dev"
                 }
             },
             "autoload": {
@@ -5578,30 +5734,30 @@
                 "interoperability",
                 "standards"
             ],
-            "time": "2019-09-17T09:54:03+00:00"
+            "time": "2019-11-18T17:27:11+00:00"
         },
         {
             "name": "symfony/filesystem",
-            "version": "v4.4.0",
+            "version": "v5.0.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/filesystem.git",
-                "reference": "d12b01cba60be77b583c9af660007211e3909854"
+                "reference": "7cd0dafc4353a0f62e307df90b48466379c8cc91"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/filesystem/zipball/d12b01cba60be77b583c9af660007211e3909854",
-                "reference": "d12b01cba60be77b583c9af660007211e3909854",
+                "url": "https://api.github.com/repos/symfony/filesystem/zipball/7cd0dafc4353a0f62e307df90b48466379c8cc91",
+                "reference": "7cd0dafc4353a0f62e307df90b48466379c8cc91",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1.3",
+                "php": "^7.2.5",
                 "symfony/polyfill-ctype": "~1.8"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.4-dev"
+                    "dev-master": "5.0-dev"
                 }
             },
             "autoload": {
@@ -5628,56 +5784,7 @@
             ],
             "description": "Symfony Filesystem Component",
             "homepage": "https://symfony.com",
-            "time": "2019-11-12T14:51:11+00:00"
-        },
-        {
-            "name": "symfony/finder",
-            "version": "v4.4.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/symfony/finder.git",
-                "reference": "ce8743441da64c41e2a667b8eb66070444ed911e"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/symfony/finder/zipball/ce8743441da64c41e2a667b8eb66070444ed911e",
-                "reference": "ce8743441da64c41e2a667b8eb66070444ed911e",
-                "shasum": ""
-            },
-            "require": {
-                "php": "^7.1.3"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "4.4-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Symfony\\Component\\Finder\\": ""
-                },
-                "exclude-from-classmap": [
-                    "/Tests/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Fabien Potencier",
-                    "email": "fabien@symfony.com"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                }
-            ],
-            "description": "Symfony Finder Component",
-            "homepage": "https://symfony.com",
-            "time": "2019-11-17T21:56:56+00:00"
+            "time": "2020-04-12T14:40:17+00:00"
         },
         {
             "name": "symfony/options-resolver",
@@ -5735,16 +5842,16 @@
         },
         {
             "name": "symfony/polyfill-php73",
-            "version": "v1.13.0",
+            "version": "v1.17.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-php73.git",
-                "reference": "4b0e2222c55a25b4541305a053013d5647d3a25f"
+                "reference": "a760d8964ff79ab9bf057613a5808284ec852ccc"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-php73/zipball/4b0e2222c55a25b4541305a053013d5647d3a25f",
-                "reference": "4b0e2222c55a25b4541305a053013d5647d3a25f",
+                "url": "https://api.github.com/repos/symfony/polyfill-php73/zipball/a760d8964ff79ab9bf057613a5808284ec852ccc",
+                "reference": "a760d8964ff79ab9bf057613a5808284ec852ccc",
                 "shasum": ""
             },
             "require": {
@@ -5753,7 +5860,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.13-dev"
+                    "dev-master": "1.17-dev"
                 }
             },
             "autoload": {
@@ -5789,24 +5896,24 @@
                 "portable",
                 "shim"
             ],
-            "time": "2019-11-27T16:25:15+00:00"
+            "time": "2020-05-12T16:47:27+00:00"
         },
         {
             "name": "symfony/service-contracts",
-            "version": "v2.0.0",
+            "version": "v2.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/service-contracts.git",
-                "reference": "9d99e1556417bf227a62e14856d630672bf10eaf"
+                "reference": "144c5e51266b281231e947b51223ba14acf1a749"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/service-contracts/zipball/9d99e1556417bf227a62e14856d630672bf10eaf",
-                "reference": "9d99e1556417bf227a62e14856d630672bf10eaf",
+                "url": "https://api.github.com/repos/symfony/service-contracts/zipball/144c5e51266b281231e947b51223ba14acf1a749",
+                "reference": "144c5e51266b281231e947b51223ba14acf1a749",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.2.9",
+                "php": "^7.2.5",
                 "psr/container": "^1.0"
             },
             "suggest": {
@@ -5847,7 +5954,7 @@
                 "interoperability",
                 "standards"
             ],
-            "time": "2019-11-09T09:18:34+00:00"
+            "time": "2019-11-18T17:27:11+00:00"
         },
         {
             "name": "symfony/var-dumper",
@@ -6011,15 +6118,6 @@
                 "validate"
             ],
             "time": "2019-11-24T13:36:37+00:00"
-        },
-        {
-            "name": "ytdl-org/youtube-dl",
-            "version": "2020.05.08",
-            "dist": {
-                "type": "zip",
-                "url": "https://github.com/ytdl-org/youtube-dl/archive/2020.05.08.zip"
-            },
-            "type": "library"
         }
     ],
     "aliases": [],
diff --git a/config/config.example.yml b/config/config.example.yml
index 7bf520c..8aeb99a 100644
--- a/config/config.example.yml
+++ b/config/config.example.yml
@@ -22,14 +22,14 @@ convertAdvanced: false
 # List of formats available in advanced conversion mode
 convertAdvancedFormats: [mp3, avi, flv, wav]
 
-# Path to your avconv or ffmpeg binary
-avconv: vendor/bin/ffmpeg
+# Path to your ffmpeg binary
+ffmpeg: /usr/bin/ffmpeg
 
-# avconv/ffmpeg logging level.
-avconvVerbosity: error
+# ffmpeg logging level.
+ffmpegVerbosity: error
 
 # Path to the directory that contains the phantomjs binary.
-phantomjsDir: vendor/bin/
+phantomjsDir: /usr/bin/
 
 # True to disable URL rewriting
 uglyUrls: false
@@ -49,9 +49,9 @@ appName: AllTube Download
 
 # Generic formats supported by youtube-dl
 genericFormats:
-    best: Best
+    best/bestvideo: Best
     bestvideo+bestaudio: Remux best video with best audio
-    worst: Worst
+    worst/worstvideo: Worst
 
 # Enable debug mode.
 debug: false
diff --git a/config/config_test.yml b/config/config_test.yml
index 99b704b..893344a 100644
--- a/config/config_test.yml
+++ b/config/config_test.yml
@@ -1,3 +1,3 @@
 ---
 convert: false
-avconvVerbosity: fatal
+ffmpegVerbosity: fatal
diff --git a/config/config_test_windows.yml b/config/config_test_windows.yml
deleted file mode 100644
index 34d8f13..0000000
--- a/config/config_test_windows.yml
+++ /dev/null
@@ -1,13 +0,0 @@
----
-convert: false
-python: C:\Python36\python.exe
-avconv: C:\ProgramData\chocolatey\bin\ffmpeg.exe
-avconvVerbosity: fatal
-phantomjsDir: C:\ProgramData\chocolatey\bin\
-youtubedl: C:\Python36\Lib\site-packages\youtube_dl\__main__.py
-params:
-    - --no-warnings
-    - --ignore-errors
-    - --flat-playlist
-    - --restrict-filenames
-    - --no-check-certificate
diff --git a/controllers/BaseController.php b/controllers/BaseController.php
index 59e9862..05d3eb2 100644
--- a/controllers/BaseController.php
+++ b/controllers/BaseController.php
@@ -7,12 +7,14 @@
 namespace Alltube\Controller;
 
 use Alltube\Config;
+use Alltube\Library\Downloader;
+use Alltube\Library\Video;
 use Alltube\LocaleManager;
 use Alltube\SessionManager;
-use Alltube\Video;
 use Aura\Session\Segment;
 use Psr\Container\ContainerInterface;
 use Slim\Http\Request;
+use Slim\Http\Response;
 
 /**
  * Abstract class used by every controller.
@@ -31,7 +33,7 @@ abstract class BaseController
      *
      * @var string
      */
-    protected $defaultFormat = 'best[protocol=https]/best[protocol=http]';
+    protected $defaultFormat = 'best/bestvideo';
 
     /**
      * Slim dependency container.
@@ -61,6 +63,13 @@ abstract class BaseController
      */
     protected $localeManager;
 
+    /**
+     * Downloader instance.
+     *
+     * @var Downloader
+     */
+    protected $downloader;
+
     /**
      * BaseController constructor.
      *
@@ -73,9 +82,11 @@ abstract class BaseController
         $session = SessionManager::getSession();
         $this->sessionSegment = $session->getSegment(self::class);
         $this->localeManager = $this->container->get('locale');
+        $this->downloader = $this->config->getDownloader();
 
-        if ($this->config->stream) {
-            $this->defaultFormat = 'best';
+        if (!$this->config->stream) {
+            // Force HTTP if stream is not enabled.
+            $this->defaultFormat = Config::addHttpToFormat($this->defaultFormat);
         }
     }
 
@@ -116,4 +127,20 @@ abstract class BaseController
 
         return $password;
     }
+
+    /**
+     * Display an user-friendly error.
+     *
+     * @param Request $request PSR-7 request
+     * @param Response $response PSR-7 response
+     * @param string $message Error message
+     *
+     * @return Response HTTP response
+     */
+    protected function displayError(Request $request, Response $response, $message)
+    {
+        $controller = new FrontController($this->container);
+
+        return $controller->displayError($request, $response, $message);
+    }
 }
diff --git a/controllers/DownloadController.php b/controllers/DownloadController.php
index 30f1e27..dd3e46f 100644
--- a/controllers/DownloadController.php
+++ b/controllers/DownloadController.php
@@ -6,13 +6,19 @@
 
 namespace Alltube\Controller;
 
-use Alltube\Exception\EmptyUrlException;
-use Alltube\Exception\PasswordException;
+use Alltube\Config;
+use Alltube\Library\Exception\EmptyUrlException;
+use Alltube\Library\Exception\InvalidProtocolConversionException;
+use Alltube\Library\Exception\PasswordException;
+use Alltube\Library\Exception\AlltubeLibraryException;
+use Alltube\Library\Exception\PlaylistConversionException;
+use Alltube\Library\Exception\PopenStreamException;
+use Alltube\Library\Exception\RemuxException;
+use Alltube\Library\Exception\WrongPasswordException;
+use Alltube\Library\Exception\YoutubedlException;
 use Alltube\Stream\ConvertedPlaylistArchiveStream;
 use Alltube\Stream\PlaylistArchiveStream;
 use Alltube\Stream\YoutubeStream;
-use Alltube\Video;
-use Exception;
 use Slim\Http\Request;
 use Slim\Http\Response;
 use Slim\Http\Stream;
@@ -25,17 +31,18 @@ class DownloadController extends BaseController
     /**
      * Redirect to video file.
      *
-     * @param Request  $request  PSR-7 request
+     * @param Request $request PSR-7 request
      * @param Response $response PSR-7 response
      *
      * @return Response HTTP response
+     * @throws AlltubeLibraryException
      */
     public function download(Request $request, Response $response)
     {
         $url = $request->getQueryParam('url');
 
         if (isset($url)) {
-            $this->video = new Video($url, $this->getFormat($request), $this->getPassword($request));
+            $this->video = $this->downloader->getVideo($url, $this->getFormat($request), $this->getPassword($request));
 
             try {
                 if ($this->config->convert && $request->getQueryParam('audio')) {
@@ -49,14 +56,33 @@ class DownloadController extends BaseController
                 // Regular download.
                 return $this->getDownloadResponse($request, $response);
             } catch (PasswordException $e) {
-                return $response->withRedirect(
-                    $this->container->get('router')->pathFor('info') .
-                        '?' . http_build_query($request->getQueryParams())
-                );
-            } catch (Exception $e) {
-                $response->getBody()->write($e->getMessage());
+                $frontController = new FrontController($this->container);
 
-                return $response->withHeader('Content-Type', 'text/plain')->withStatus(500);
+                return $frontController->password($request, $response);
+            } catch (WrongPasswordException $e) {
+                return $this->displayError($request, $response, $this->localeManager->t('Wrong password'));
+            } catch (PlaylistConversionException $e) {
+                return $this->displayError(
+                    $request,
+                    $response,
+                    $this->localeManager->t('Conversion of playlists is not supported.')
+                );
+            } catch (InvalidProtocolConversionException $e) {
+                if (in_array($this->video->protocol, ['m3u8', 'm3u8_native'])) {
+                    return $this->displayError(
+                        $request,
+                        $response,
+                        $this->localeManager->t('Conversion of M3U8 files is not supported.')
+                    );
+                } elseif ($this->video->protocol == 'http_dash_segments') {
+                    return $this->displayError(
+                        $request,
+                        $response,
+                        $this->localeManager->t('Conversion of DASH segments is not supported.')
+                    );
+                } else {
+                    throw $e;
+                }
             }
         } else {
             return $response->withRedirect($this->container->get('router')->pathFor('index'));
@@ -70,8 +96,7 @@ class DownloadController extends BaseController
      * @param Response $response PSR-7 response
      *
      * @return Response HTTP response
-     * @throws PasswordException
-     * @throws Exception
+     * @throws AlltubeLibraryException
      */
     private function getConvertedAudioResponse(Request $request, Response $response)
     {
@@ -86,13 +111,7 @@ class DownloadController extends BaseController
         $response = $response->withHeader('Content-Type', 'audio/mpeg');
 
         if ($request->isGet() || $request->isPost()) {
-            try {
-                $process = $this->video->getAudioStream($from, $to);
-            } catch (Exception $e) {
-                // Fallback to default format.
-                $this->video = $this->video->withFormat($this->defaultFormat);
-                $process = $this->video->getAudioStream($from, $to);
-            }
+            $process = $this->downloader->getAudioStream($this->video, $this->config->audioBitrate, $from, $to);
             $response = $response->withBody(new Stream($process));
         }
 
@@ -106,36 +125,38 @@ class DownloadController extends BaseController
      * @param Response $response PSR-7 response
      *
      * @return Response HTTP response
+     * @throws AlltubeLibraryException
+     * @throws EmptyUrlException
      * @throws PasswordException
+     * @throws WrongPasswordException
      */
     private function getAudioResponse(Request $request, Response $response)
     {
-        try {
-            // First, we try to get a MP3 file directly.
-            if (!empty($request->getQueryParam('from')) || !empty($request->getQueryParam('to'))) {
-                throw new Exception('Force convert when we need to seek.');
-            }
-
-            if ($this->config->stream) {
-                $this->video = $this->video->withFormat('mp3');
-
-                return $this->getStream($request, $response);
-            } else {
-                $this->video = $this->video->withFormat('mp3[protocol=https]/mp3[protocol=http]');
-
-                $urls = $this->video->getUrl();
-
-                return $response->withRedirect($urls[0]);
-            }
-        } catch (PasswordException $e) {
-            $frontController = new FrontController($this->container);
-
-            return $frontController->password($request, $response);
-        } catch (Exception $e) {
-            // If MP3 is not available, we convert it.
-            $this->video = $this->video->withFormat('bestaudio/best');
+        if (!empty($request->getQueryParam('from')) || !empty($request->getQueryParam('to'))) {
+            // Force convert when we need to seek.
+            $this->video = $this->video->withFormat('bestaudio/' . $this->defaultFormat);
 
             return $this->getConvertedAudioResponse($request, $response);
+        } else {
+            try {
+                // First, we try to get a MP3 file directly.
+                if ($this->config->stream) {
+                    $this->video = $this->video->withFormat('mp3');
+
+                    return $this->getStream($request, $response);
+                } else {
+                    $this->video = $this->video->withFormat(Config::addHttpToFormat('mp3'));
+
+                    $urls = $this->video->getUrl();
+
+                    return $response->withRedirect($urls[0]);
+                }
+            } catch (YoutubedlException $e) {
+                // If MP3 is not available, we convert it.
+                $this->video = $this->video->withFormat('bestaudio/' . $this->defaultFormat);
+
+                return $this->getConvertedAudioResponse($request, $response);
+            }
         }
     }
 
@@ -146,17 +167,15 @@ class DownloadController extends BaseController
      *
      * @param Response $response PSR-7 response
      * @return Response HTTP response
-     * @throws EmptyUrlException
-     * @throws PasswordException
-     * @throws Exception
+     * @throws AlltubeLibraryException
      */
     private function getStream(Request $request, Response $response)
     {
         if (isset($this->video->entries)) {
             if ($this->config->convert && $request->getQueryParam('audio')) {
-                $stream = new ConvertedPlaylistArchiveStream($this->video);
+                $stream = new ConvertedPlaylistArchiveStream($this->downloader, $this->video);
             } else {
-                $stream = new PlaylistArchiveStream($this->video);
+                $stream = new PlaylistArchiveStream($this->downloader, $this->video);
             }
             $response = $response->withHeader('Content-Type', 'application/zip');
             $response = $response->withHeader(
@@ -167,10 +186,10 @@ class DownloadController extends BaseController
             return $response->withBody($stream);
         } elseif ($this->video->protocol == 'rtmp') {
             $response = $response->withHeader('Content-Type', 'video/' . $this->video->ext);
-            $body = new Stream($this->video->getRtmpStream());
+            $body = new Stream($this->downloader->getRtmpStream($this->video));
         } elseif ($this->video->protocol == 'm3u8' || $this->video->protocol == 'm3u8_native') {
             $response = $response->withHeader('Content-Type', 'video/' . $this->video->ext);
-            $body = new Stream($this->video->getM3uStream());
+            $body = new Stream($this->downloader->getM3uStream($this->video));
         } else {
             $headers = [];
             $range = $request->getHeader('Range');
@@ -178,7 +197,7 @@ class DownloadController extends BaseController
             if (!empty($range)) {
                 $headers['Range'] = $range;
             }
-            $stream = $this->video->getHttpResponse($headers);
+            $stream = $this->downloader->getHttpResponse($this->video, $headers);
 
             $response = $response->withHeader('Content-Type', $stream->getHeader('Content-Type'));
             $response = $response->withHeader('Content-Length', $stream->getHeader('Content-Length'));
@@ -190,7 +209,7 @@ class DownloadController extends BaseController
 
             if (isset($this->video->downloader_options->http_chunk_size)) {
                 // Workaround for Youtube throttling the download speed.
-                $body = new YoutubeStream($this->video);
+                $body = new YoutubeStream($this->downloader, $this->video);
             } else {
                 $body = $stream->getBody();
             }
@@ -201,7 +220,7 @@ class DownloadController extends BaseController
         $response = $response->withHeader(
             'Content-Disposition',
             'attachment; filename="' .
-                $this->video->getFilename() . '"'
+            $this->video->getFilename() . '"'
         );
 
         return $response;
@@ -210,19 +229,18 @@ class DownloadController extends BaseController
     /**
      * Get a remuxed stream piped through the server.
      *
-     * @param Response $response PSR-7 response
      * @param Request $request PSR-7 request
      *
+     * @param Response $response PSR-7 response
      * @return Response HTTP response
-     * @throws PasswordException
-     * @throws Exception
+     * @throws AlltubeLibraryException
      */
     private function getRemuxStream(Request $request, Response $response)
     {
         if (!$this->config->remux) {
-            throw new Exception($this->localeManager->t('You need to enable remux mode to merge two formats.'));
+            throw new RemuxException('You need to enable remux mode to merge two formats.');
         }
-        $stream = $this->video->getRemuxStream();
+        $stream = $this->downloader->getRemuxStream($this->video);
         $response = $response->withHeader('Content-Type', 'video/x-matroska');
         if ($request->isGet()) {
             $response = $response->withBody(new Stream($stream));
@@ -242,9 +260,7 @@ class DownloadController extends BaseController
      *
      * @param Response $response PSR-7 response
      * @return Response HTTP response
-     * @throws EmptyUrlException
-     * @throws PasswordException
-     * @throws Exception
+     * @throws AlltubeLibraryException
      */
     private function getDownloadResponse(Request $request, Response $response)
     {
@@ -263,7 +279,7 @@ class DownloadController extends BaseController
             return $this->getStream($request, $response);
         } else {
             if (empty($videoUrls[0])) {
-                throw new Exception($this->localeManager->t("Can't find URL of video."));
+                throw new EmptyUrlException("Can't find URL of video.");
             }
 
             return $response->withRedirect($videoUrls[0]);
@@ -277,8 +293,13 @@ class DownloadController extends BaseController
      * @param Response $response PSR-7 response
      *
      * @return Response HTTP response
+     * @throws AlltubeLibraryException
+     * @throws InvalidProtocolConversionException
      * @throws PasswordException
-     * @throws Exception
+     * @throws PlaylistConversionException
+     * @throws WrongPasswordException
+     * @throws YoutubedlException
+     * @throws PopenStreamException
      */
     private function getConvertedResponse(Request $request, Response $response)
     {
@@ -290,7 +311,8 @@ class DownloadController extends BaseController
         $response = $response->withHeader('Content-Type', 'video/' . $request->getQueryParam('customFormat'));
 
         if ($request->isGet() || $request->isPost()) {
-            $process = $this->video->getConvertedStream(
+            $process = $this->downloader->getConvertedStream(
+                $this->video,
                 $request->getQueryParam('customBitrate'),
                 $request->getQueryParam('customFormat')
             );
diff --git a/controllers/FrontController.php b/controllers/FrontController.php
index 01030aa..2b6109a 100644
--- a/controllers/FrontController.php
+++ b/controllers/FrontController.php
@@ -6,14 +6,13 @@
 
 namespace Alltube\Controller;
 
-use Alltube\Exception\PasswordException;
+use Alltube\Library\Exception\PasswordException;
+use Alltube\Library\Exception\AlltubeLibraryException;
+use Alltube\Library\Exception\WrongPasswordException;
 use Alltube\Locale;
-use Alltube\Video;
-use Symfony\Component\ErrorHandler\ErrorHandler;
-use Symfony\Component\ErrorHandler\ErrorRenderer\HtmlErrorRenderer;
-use Symfony\Component\ErrorHandler\Exception\FlattenException;
-use Throwable;
 use Exception;
+use Symfony\Component\ErrorHandler\ErrorRenderer\HtmlErrorRenderer;
+use Throwable;
 use Psr\Container\ContainerInterface;
 use Slim\Http\Request;
 use Slim\Http\Response;
@@ -96,7 +95,7 @@ class FrontController extends BaseController
      * @param Response $response PSR-7 response
      *
      * @return Response HTTP response
-     * @throws PasswordException
+     * @throws AlltubeLibraryException
      */
     public function extractors(Request $request, Response $response)
     {
@@ -105,7 +104,7 @@ class FrontController extends BaseController
             'extractors.tpl',
             [
                 'config' => $this->config,
-                'extractors' => Video::getExtractors(),
+                'extractors' => $this->downloader->getExtractors(),
                 'class' => 'extractors',
                 'title' => $this->localeManager->t('Supported websites'),
                 'description' => $this->localeManager->t('List of all supported websites from which Alltube Download ' .
@@ -143,7 +142,7 @@ class FrontController extends BaseController
             ]
         );
 
-        return $response;
+        return $response->withStatus(403);
     }
 
     /**
@@ -153,6 +152,7 @@ class FrontController extends BaseController
      * @param Response $response PSR-7 response
      *
      * @return Response HTTP response
+     * @throws AlltubeLibraryException
      */
     private function getInfoResponse(Request $request, Response $response)
     {
@@ -160,6 +160,8 @@ class FrontController extends BaseController
             $this->video->getJson();
         } catch (PasswordException $e) {
             return $this->password($request, $response);
+        } catch (WrongPasswordException $e) {
+            return $this->displayError($request, $response, $this->localeManager->t('Wrong password'));
         }
 
         if (isset($this->video->entries)) {
@@ -207,13 +209,14 @@ class FrontController extends BaseController
      * @param Response $response PSR-7 response
      *
      * @return Response HTTP response
+     * @throws AlltubeLibraryException
      */
     public function info(Request $request, Response $response)
     {
         $url = $request->getQueryParam('url') ?: $request->getQueryParam('v');
 
         if (isset($url) && !empty($url)) {
-            $this->video = new Video($url, $this->getFormat($request), $this->getPassword($request));
+            $this->video = $this->downloader->getVideo($url, $this->getFormat($request), $this->getPassword($request));
 
             if ($this->config->convert && $request->getQueryParam('audio')) {
                 // We skip the info page and get directly to the download.
@@ -229,6 +232,33 @@ class FrontController extends BaseController
         }
     }
 
+    /**
+     * Display an user-friendly error.
+     *
+     * @param Request $request PSR-7 request
+     * @param Response $response PSR-7 response
+     * @param string $message Error message
+     *
+     * @return Response HTTP response
+     */
+    protected function displayError(Request $request, Response $response, $message)
+    {
+        $this->view->render(
+            $response,
+            'error.tpl',
+            [
+                'config' => $this->config,
+                'error' => $message,
+                'class' => 'video',
+                'title' => $this->localeManager->t('Error'),
+                'canonical' => $this->getCanonicalUrl($request),
+                'locale' => $this->localeManager->getLocale(),
+            ]
+        );
+
+        return $response->withStatus(500);
+    }
+
     /**
      * Display an error page.
      *
@@ -243,7 +273,11 @@ class FrontController extends BaseController
         if ($this->config->debug) {
             $renderer = new HtmlErrorRenderer(true);
             $exception = $renderer->render($error);
+
             $response->getBody()->write($exception->getAsString());
+            foreach ($exception->getHeaders() as $header => $value) {
+                $response = $response->withHeader($header, $value);
+            }
 
             return $response->withStatus($exception->getStatusCode());
         } else {
@@ -253,20 +287,7 @@ class FrontController extends BaseController
                 $message = '';
             }
 
-            $this->view->render(
-                $response,
-                'error.tpl',
-                [
-                    'config' => $this->config,
-                    'error' => $message,
-                    'class' => 'video',
-                    'title' => $this->localeManager->t('Error'),
-                    'canonical' => $this->getCanonicalUrl($request),
-                    'locale' => $this->localeManager->getLocale(),
-                ]
-            );
-
-            return $response->withStatus(500);
+            return $this->displayError($request, $response, $message);
         }
     }
 
diff --git a/controllers/JsonController.php b/controllers/JsonController.php
index bfc9d75..9e37cc2 100644
--- a/controllers/JsonController.php
+++ b/controllers/JsonController.php
@@ -6,8 +6,7 @@
 
 namespace Alltube\Controller;
 
-use Alltube\Video;
-use Exception;
+use Alltube\Library\Exception\AlltubeLibraryException;
 use Slim\Http\Request;
 use Slim\Http\Response;
 
@@ -19,24 +18,24 @@ class JsonController extends BaseController
     /**
      * Return the JSON object generated by youtube-dl.
      *
-     * @param Request  $request  PSR-7 request
+     * @param Request $request PSR-7 request
      * @param Response $response PSR-7 response
      *
      * @return Response HTTP response
+     * @throws AlltubeLibraryException
      */
     public function json(Request $request, Response $response)
     {
         $url = $request->getQueryParam('url');
 
         if (isset($url)) {
-            try {
-                $this->video = new Video($url, $this->getFormat($request), $this->getPassword($request));
+            $this->video = $this->downloader->getVideo(
+                $url,
+                $this->getFormat($request),
+                $this->getPassword($request)
+            );
 
-                return $response->withJson($this->video->getJson());
-            } catch (Exception $e) {
-                return $response->withJson(['error' => $e->getMessage()])
-                    ->withStatus(500);
-            }
+            return $response->withJson($this->video->getJson());
         } else {
             return $response->withJson(['error' => 'You need to provide the url parameter'])
                 ->withStatus(400);
diff --git a/docs/.htaccess b/docs/.htaccess
deleted file mode 100644
index 4ee1d3d..0000000
--- a/docs/.htaccess
+++ /dev/null
@@ -1,3 +0,0 @@
-<ifmodule mod_headers.c>
-    Header set Content-Security-Policy "default-src 'self'; object-src 'none'; script-src http: 'unsafe-inline'; img-src http:; style-src 'self' 'unsafe-inline' https:; font-src http:"
-</ifmodule>
diff --git a/i18n/it_IT/LC_MESSAGES/Alltube.po b/i18n/it_IT/LC_MESSAGES/Alltube.po
new file mode 100644
index 0000000..cd7ab21
--- /dev/null
+++ b/i18n/it_IT/LC_MESSAGES/Alltube.po
@@ -0,0 +1,248 @@
+msgid ""
+msgstr "Content-Type: text/plain; charset=UTF-8\n"
+
+#: templates/playlist.tpl:13
+msgid "Videos extracted from @title:"
+msgstr "Video estratti da @title:"
+
+#: templates/playlist.tpl:38 templates/password.tpl:11 templates/index.tpl:19
+#: templates/info.tpl:98
+msgid "Download"
+msgstr "Download"
+
+#: templates/playlist.tpl:39
+msgid "More options"
+msgstr "Più opzioni"
+
+#: templates/inc/header.tpl:4
+msgid "Switch language"
+msgstr "Cambia lingua"
+
+#: templates/inc/header.tpl:8
+msgid "Set language"
+msgstr "Imposta lingua"
+
+#: templates/inc/footer.tpl:8
+msgid "Code by @dev"
+msgstr "Codice di @dev"
+
+#: templates/inc/footer.tpl:16
+msgid "Design by @designer"
+msgstr "Design di @designer"
+
+#: templates/inc/footer.tpl:21
+msgid "Get the code"
+msgstr "Ottieni il codice"
+
+#: templates/inc/footer.tpl:29
+msgid "Based on @youtubedl"
+msgstr "Basato su @youtubedl"
+
+#: templates/inc/footer.tpl:33
+msgid "Donate using Liberapay"
+msgstr "Fai una donazione con Liberapay"
+
+#: templates/inc/footer.tpl:35
+msgid "Donate"
+msgstr "Dona"
+
+#: templates/password.tpl:5
+msgid "This video is protected"
+msgstr "Questo video è protetto"
+
+#: templates/password.tpl:6
+msgid "You need a password in order to download this video."
+msgstr "Ti serve una password per scaricare questo video."
+
+#: templates/password.tpl:8
+msgid "Video password"
+msgstr "Password del video"
+
+#: templates/index.tpl:8
+msgid "Copy here the URL of your video (Youtube, Dailymotion, etc.)"
+msgstr "Copia qui l'URL del video (Youtube, Dailymotion, ecc.)"
+
+#: templates/index.tpl:25
+msgid "Audio only (MP3)"
+msgstr "Solo audio (MP3)"
+
+#: templates/index.tpl:28
+msgid "From"
+msgstr "Da"
+
+#: templates/index.tpl:29
+msgid "to"
+msgstr "a"
+
+#: templates/index.tpl:36
+msgid "See all supported websites"
+msgstr "Guarda tutti i siti supportati"
+
+#: templates/index.tpl:38
+msgid "Drag this to your bookmarks bar:"
+msgstr "Trascina questo nella tua barra dei segnalibri:"
+
+#: templates/index.tpl:39
+msgid "Bookmarklet"
+msgstr "Bookmarklet"
+
+#: templates/info.tpl:13
+msgid "You are going to download @title."
+msgstr "Stai per scaricare @title."
+
+#: templates/info.tpl:31
+msgid "Available formats:"
+msgstr "Formati disponibili:"
+
+#: templates/info.tpl:33
+msgid "Generic formats"
+msgstr "Formati generici"
+
+#: templates/info.tpl:38
+msgid "Detailed formats"
+msgstr "Formati dettagliati"
+
+#: templates/info.tpl:80
+msgid "Stream the video through the server"
+msgstr "Riproduci il video attraverso il server"
+
+#: templates/info.tpl:85
+msgid "Convert into a custom format:"
+msgstr "Converti in un formato personalizzato:"
+
+#: templates/info.tpl:86
+msgid "Custom format"
+msgstr "Formato personalizzato"
+
+#: templates/info.tpl:86
+msgid "Format to convert to"
+msgstr "Formato verso cui convertire"
+
+#: templates/info.tpl:91
+msgid "with"
+msgstr "con"
+
+#: templates/info.tpl:92
+msgid "Bit rate"
+msgstr "Bit rate"
+
+#: templates/info.tpl:93
+msgid "Custom bitrate"
+msgstr "bitrate personalizzato"
+
+#: templates/info.tpl:95
+msgid "kbit/s audio"
+msgstr "kbit/s audio"
+
+#: templates/error.tpl:5
+msgid "An error occurred"
+msgstr "Si è verificato un errore"
+
+#: templates/error.tpl:6
+msgid "Please check the URL of your video."
+msgstr "Per favore controlla l'URL del video."
+
+#: templates/extractors.tpl:4 controllers/FrontController.php:109
+msgid "Supported websites"
+msgstr "Siti supportati"
+
+#: classes/Config.php:158
+msgid "Best"
+msgstr "Migliore"
+
+#: classes/Config.php:159
+msgid "Remux best video with best audio"
+msgstr "Fai il remux del video migliore con l'audio migliore"
+
+#: classes/Config.php:160
+msgid "Worst"
+msgstr "Peggiore"
+
+#: classes/Video.php:159
+msgid "Wrong password"
+msgstr "Password errata"
+
+#: classes/Video.php:250
+msgid "youtube-dl returned an empty URL."
+msgstr "youtube-dl ha restituito un URL vuoto."
+
+#: classes/Video.php:361 classes/Video.php:465
+msgid "Can't find avconv or ffmpeg at @path."
+msgstr "Impossibile trovare avconv o ffmpeg in @path."
+
+#: classes/Video.php:377
+msgid "Invalid start time: @from."
+msgstr "Punto di inizio non valido: @from."
+
+#: classes/Video.php:384
+msgid "Invalid end time: @to."
+msgstr "Punto di fine non valido: @to."
+
+#: classes/Video.php:430
+msgid "Conversion of playlists is not supported."
+msgstr "La conversione delle playlist non è supportata."
+
+#: classes/Video.php:435 classes/Video.php:578
+msgid "Conversion of M3U8 files is not supported."
+msgstr "La conversione di file M3U8 non è supportata."
+
+#: classes/Video.php:437
+msgid "Conversion of DASH segments is not supported."
+msgstr "La conversione di segmenti DASH non è supportata."
+
+#: classes/Video.php:446 classes/Video.php:488 classes/Video.php:525
+#: classes/Video.php:558 classes/Video.php:586
+msgid "Could not open popen stream."
+msgstr "Non è stato possibile aprire il popen stream."
+
+#: classes/Video.php:506
+msgid "This video does not have two URLs."
+msgstr "Questo video non ha due URL."
+
+#: controllers/DownloadController.php:215
+msgid "You need to enable remux mode to merge two formats."
+msgstr "Devi abilitare la modalità remux per unire due formati."
+
+#: controllers/DownloadController.php:255
+msgid "Can't find URL of video."
+msgstr "Impossibile trovare l'URL del video."
+
+#: controllers/FrontController.php:64
+msgid ""
+"Easily download videos from Youtube, Dailymotion, Vimeo and other websites."
+msgstr ""
+"Scarica facilmente video da Youtube, Dailymotion, Vimeo e altri siti."
+
+#: controllers/FrontController.php:110
+msgid ""
+"List of all supported websites from which Alltube Download can extract video "
+"or audio files"
+msgstr ""
+"Lista di tutti i siti supportati da cui Alltube Download può estrarre file "
+"video o audio"
+
+#: controllers/FrontController.php:136
+msgid "Password prompt"
+msgstr "Richiesta password"
+
+#: controllers/FrontController.php:138
+msgid ""
+"You need a password in order to download this video with Alltube Download"
+msgstr ""
+"Ti serve una password per scaricare questo video con Alltube Download"
+
+#: controllers/FrontController.php:169
+msgid "Video download"
+msgstr "Download video"
+
+#: controllers/FrontController.php:171
+msgid "Download video from @extractor"
+msgstr "Scarica video da @extractor"
+
+#: controllers/FrontController.php:177
+msgid "Download @title from @extractor"
+msgstr "Scarica @title da @extractor"
+
+#: controllers/FrontController.php:253 controllers/FrontController.php:284
+msgid "Error"
+msgstr "Errore"
diff --git a/i18n/template.pot b/i18n/template.pot
index a7d5402..ce9d383 100644
--- a/i18n/template.pot
+++ b/i18n/template.pot
@@ -1,27 +1,6 @@
 msgid ""
 msgstr "Content-Type: text/plain; charset=UTF-8\n"
 
-#: templates/playlist.tpl:13
-msgid "Videos extracted from @title:"
-msgstr ""
-
-#: templates/playlist.tpl:38 templates/password.tpl:11 templates/index.tpl:19
-#: templates/info.tpl:98
-msgid "Download"
-msgstr ""
-
-#: templates/playlist.tpl:39
-msgid "More options"
-msgstr ""
-
-#: templates/inc/header.tpl:4
-msgid "Switch language"
-msgstr ""
-
-#: templates/inc/header.tpl:8
-msgid "Set language"
-msgstr ""
-
 #: templates/inc/footer.tpl:8
 msgid "Code by @dev"
 msgstr ""
@@ -46,6 +25,87 @@ msgstr ""
 msgid "Donate"
 msgstr ""
 
+#: templates/inc/header.tpl:4
+msgid "Switch language"
+msgstr ""
+
+#: templates/inc/header.tpl:8
+msgid "Set language"
+msgstr ""
+
+#: templates/info.tpl:11
+msgid "You are going to download @title."
+msgstr ""
+
+#: templates/info.tpl:29
+msgid "Available formats:"
+msgstr ""
+
+#: templates/info.tpl:31
+msgid "Generic formats"
+msgstr ""
+
+#: templates/info.tpl:36
+msgid "Detailed formats"
+msgstr ""
+
+#: templates/info.tpl:80
+msgid "Stream the video through the server"
+msgstr ""
+
+#: templates/info.tpl:86
+msgid "Convert into a custom format:"
+msgstr ""
+
+#: templates/info.tpl:87
+msgid "Custom format"
+msgstr ""
+
+#: templates/info.tpl:87
+msgid "Format to convert to"
+msgstr ""
+
+#: templates/info.tpl:92
+msgid "with"
+msgstr ""
+
+#: templates/info.tpl:93
+msgid "Bit rate"
+msgstr ""
+
+#: templates/info.tpl:94
+msgid "Custom bitrate"
+msgstr ""
+
+#: templates/info.tpl:97
+msgid "kbit/s audio"
+msgstr ""
+
+#: templates/info.tpl:101 templates/playlist.tpl:38 templates/password.tpl:11
+#: templates/index.tpl:19
+msgid "Download"
+msgstr ""
+
+#: templates/playlist.tpl:12
+msgid "Videos extracted from @title:"
+msgstr ""
+
+#: templates/playlist.tpl:39
+msgid "More options"
+msgstr ""
+
+#: templates/extractors.tpl:4 controllers/FrontController.php:109
+msgid "Supported websites"
+msgstr ""
+
+#: templates/error.tpl:5
+msgid "An error occurred"
+msgstr ""
+
+#: templates/error.tpl:6
+msgid "Please check the URL of your video."
+msgstr ""
+
 #: templates/password.tpl:5
 msgid "This video is protected"
 msgstr ""
@@ -70,144 +130,51 @@ msgstr ""
 msgid "From"
 msgstr ""
 
-#: templates/index.tpl:29
+#: templates/index.tpl:31
 msgid "to"
 msgstr ""
 
-#: templates/index.tpl:36
+#: templates/index.tpl:39
 msgid "See all supported websites"
 msgstr ""
 
-#: templates/index.tpl:38
+#: templates/index.tpl:41
 msgid "Drag this to your bookmarks bar:"
 msgstr ""
 
-#: templates/index.tpl:39
+#: templates/index.tpl:43
 msgid "Bookmarklet"
 msgstr ""
 
-#: templates/info.tpl:13
-msgid "You are going to download @title."
-msgstr ""
-
-#: templates/info.tpl:31
-msgid "Available formats:"
-msgstr ""
-
-#: templates/info.tpl:33
-msgid "Generic formats"
-msgstr ""
-
-#: templates/info.tpl:38
-msgid "Detailed formats"
-msgstr ""
-
-#: templates/info.tpl:80
-msgid "Stream the video through the server"
-msgstr ""
-
-#: templates/info.tpl:85
-msgid "Convert into a custom format:"
-msgstr ""
-
-#: templates/info.tpl:86
-msgid "Custom format"
-msgstr ""
-
-#: templates/info.tpl:86
-msgid "Format to convert to"
-msgstr ""
-
-#: templates/info.tpl:91
-msgid "with"
-msgstr ""
-
-#: templates/info.tpl:92
-msgid "Bit rate"
-msgstr ""
-
-#: templates/info.tpl:93
-msgid "Custom bitrate"
-msgstr ""
-
-#: templates/info.tpl:95
-msgid "kbit/s audio"
-msgstr ""
-
-#: templates/error.tpl:5
-msgid "An error occurred"
-msgstr ""
-
-#: templates/error.tpl:6
-msgid "Please check the URL of your video."
-msgstr ""
-
-#: templates/extractors.tpl:4 controllers/FrontController.php:109
-msgid "Supported websites"
-msgstr ""
-
-#: classes/Config.php:158
+#: classes/Config.php:156
 msgid "Best"
 msgstr ""
 
-#: classes/Config.php:159
+#: classes/Config.php:157
 msgid "Remux best video with best audio"
 msgstr ""
 
-#: classes/Config.php:160
+#: classes/Config.php:158
 msgid "Worst"
 msgstr ""
 
-#: classes/Video.php:159
+#: controllers/DownloadController.php:63 controllers/FrontController.php:164
 msgid "Wrong password"
 msgstr ""
 
-#: classes/Video.php:250
-msgid "youtube-dl returned an empty URL."
-msgstr ""
-
-#: classes/Video.php:361 classes/Video.php:465
-msgid "Can't find avconv or ffmpeg at @path."
-msgstr ""
-
-#: classes/Video.php:377
-msgid "Invalid start time: @from."
-msgstr ""
-
-#: classes/Video.php:384
-msgid "Invalid end time: @to."
-msgstr ""
-
-#: classes/Video.php:430
+#: controllers/DownloadController.php:68
 msgid "Conversion of playlists is not supported."
 msgstr ""
 
-#: classes/Video.php:435 classes/Video.php:578
+#: controllers/DownloadController.php:75
 msgid "Conversion of M3U8 files is not supported."
 msgstr ""
 
-#: classes/Video.php:437
+#: controllers/DownloadController.php:81
 msgid "Conversion of DASH segments is not supported."
 msgstr ""
 
-#: classes/Video.php:446 classes/Video.php:488 classes/Video.php:525
-#: classes/Video.php:558 classes/Video.php:586
-msgid "Could not open popen stream."
-msgstr ""
-
-#: classes/Video.php:506
-msgid "This video does not have two URLs."
-msgstr ""
-
-#: controllers/DownloadController.php:215
-msgid "You need to enable remux mode to merge two formats."
-msgstr ""
-
-#: controllers/DownloadController.php:255
-msgid "Can't find URL of video."
-msgstr ""
-
-#: controllers/FrontController.php:64
+#: controllers/FrontController.php:63
 msgid ""
 "Easily download videos from Youtube, Dailymotion, Vimeo and other websites."
 msgstr ""
@@ -227,18 +194,18 @@ msgid ""
 "You need a password in order to download this video with Alltube Download"
 msgstr ""
 
-#: controllers/FrontController.php:169
+#: controllers/FrontController.php:172
 msgid "Video download"
 msgstr ""
 
-#: controllers/FrontController.php:171
+#: controllers/FrontController.php:174
 msgid "Download video from @extractor"
 msgstr ""
 
-#: controllers/FrontController.php:177
+#: controllers/FrontController.php:180
 msgid "Download @title from @extractor"
 msgstr ""
 
-#: controllers/FrontController.php:253 controllers/FrontController.php:284
+#: controllers/FrontController.php:253
 msgid "Error"
 msgstr ""
diff --git a/index.php b/index.php
index a8b3aed..4760670 100644
--- a/index.php
+++ b/index.php
@@ -85,8 +85,6 @@ $app->any(
     '/info',
     [$frontController, 'info']
 )->setName('info');
-// Legacy route.
-$app->any('/video', [$frontController, 'info']);
 
 $app->any(
     '/watch',
@@ -97,8 +95,6 @@ $app->any(
     '/download',
     [$downloadController, 'download']
 )->setName('download');
-// Legacy route.
-$app->get('/redirect', [$downloadController, 'download']);
 
 $app->get(
     '/locale/{locale}',
@@ -116,5 +112,5 @@ try {
     die('Smarty could not compile the template file: ' . $e->getMessage());
 } catch (Throwable $e) {
     // Last resort if the error has not been caught by the error handler for some reason.
-    die('Error when starting the app: ' . $e->getMessage());
+    die('Error when starting the app: ' . htmlentities($e->getMessage()));
 }
diff --git a/resources/FAQ.md b/resources/FAQ.md
index d6304e8..2c49197 100644
--- a/resources/FAQ.md
+++ b/resources/FAQ.md
@@ -33,13 +33,13 @@ In order to enable audio conversion, you need to add this to your `config.yml` f
 
 ```yaml
 convert: true
-avconv: path/to/avconv
+ffmpeg: path/to/ffmpeg
 ```
 
-You will also need to install `avconv` on your server:
+You will also need to install `ffmpeg` on your server:
 
 ```bash
-sudo apt-get install libav-tools
+sudo apt-get install ffmpeg
 ```
 
 ## Deploy AllTube on Heroku
@@ -47,7 +47,6 @@ sudo apt-get install libav-tools
 Create a dyno with the following buildpacks:
 
 * `heroku/php`
-* `heroku/nodejs`
 * `heroku/python`
 
 You might also need to add the following config variables:
@@ -113,30 +112,6 @@ you can download it if you enable streaming (see above).
 docker run -p 8080:80 rudloff/alltube
 ```
 
-## Run Heroku locally
-
-You should be able to use `heroku local` like this:
-
-```bash
-sudo APACHE_LOCK_DIR=. APACHE_PID_FILE=./pid APACHE_RUN_USER=www-data \
-    APACHE_RUN_GROUP=www-data APACHE_LOG_DIR=. \
-    heroku local
-```
-
-You might need to create some symlinks before that:
-
-```bash
-ln -s /usr/sbin/apache2 /usr/sbin/httpd
-ln -s /usr/sbin/php-fpm7.0 /usr/sbin/php-fpm
-```
-
-And you probably need to run this in another terminal
-after `heroku local` has finished launching `php-fpm`:
-
-```bash
-chmod 0667 /tmp/heroku.fcgi.5000.sock
-```
-
 ## Download 1080p videos from Youtube
 
 Youtube distributes HD content in two separate video and audio files.
diff --git a/resources/error.xhtml b/resources/error.xhtml
deleted file mode 100644
index c0f95bf..0000000
--- a/resources/error.xhtml
+++ /dev/null
@@ -1,23 +0,0 @@
-<?xml version="1.0"?>
-<!DOCTYPE html>
-<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
-<head>
-    <meta charset="UTF-8"/>
-    <meta name="viewport" content="width=device-width, initial-scale=1"/>
-    <title>AllTube Download - Maintenance</title>
-    <link rel="stylesheet" href="../dist/main.css"/>
-    <link rel="icon" href="../img/favicon.png"/>
-</head>
-<body>
-<div class="wrapper">
-    <div class="main">
-        <h1>
-            <img class="logo" src="../img/logo.png" alt="AllTube Download" width="328" height="284"/>
-        </h1>
-        <div>An error occurred in the application and your page could not be served. Please try again in a few
-            moments.
-        </div>
-    </div>
-</div>
-</body>
-</html>
diff --git a/resources/maintenance.xhtml b/resources/maintenance.xhtml
deleted file mode 100644
index c1c9eba..0000000
--- a/resources/maintenance.xhtml
+++ /dev/null
@@ -1,21 +0,0 @@
-<?xml version="1.0"?>
-<!DOCTYPE html>
-<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
-<head>
-    <meta charset="UTF-8"/>
-    <meta name="viewport" content="width=device-width, initial-scale=1"/>
-    <title>AllTube Download - Maintenance</title>
-    <link rel="stylesheet" href="../dist/main.css"/>
-    <link rel="icon" href="../img/favicon.png"/>
-</head>
-<body>
-<div class="wrapper">
-    <div class="main">
-        <h1>
-            <img class="logo" src="../img/logo.png" alt="AllTube Download" width="328" height="284"/>
-        </h1>
-        <div>This application is undergoing maintenance right now. Please check back later.</div>
-    </div>
-</div>
-</body>
-</html>
diff --git a/templates/error.tpl b/templates/error.tpl
index 49663ec..98605b8 100644
--- a/templates/error.tpl
+++ b/templates/error.tpl
@@ -4,6 +4,6 @@
         {include file="inc/logo.tpl"}
         <h2>{t}An error occurred{/t}</h2>
         {t}Please check the URL of your video.{/t}
-        <p><i>{$error|escape}</i></p>
+        <p><i>{$error|escape|nl2br}</i></p>
     </main>
     {include file='inc/footer.tpl'}
diff --git a/templates/inc/head.tpl b/templates/inc/head.tpl
index 00a98c8..7b2f3d4 100644
--- a/templates/inc/head.tpl
+++ b/templates/inc/head.tpl
@@ -2,7 +2,7 @@
 <html {if isset($locale)}lang="{$locale->getBcp47()}"{/if}>
 <head>
     <meta charset="UTF-8"/>
-    <meta name=viewport content="width=device-width, initial-scale=1">
+    <meta name=viewport content="width=device-width, initial-scale=1"/>
     {if isset($description)}
         <meta name="description" content="{$description|escape}"/>
         <meta name="twitter:description" content="{$description|escape}"/>
@@ -19,7 +19,8 @@
     <meta name="twitter:title" content="{$config->appName}{if isset($title)} - {$title|escape}{/if}"/>
     <meta name="twitter:image" content="{base_url}/img/logo.png"/>
     <meta name="twitter:creator" content="@Tael67"/>
-    <meta name="theme-color" content="#4F4F4F">
+    <meta name="theme-color" content="#4F4F4F"/>
     <link rel="manifest" href="{base_url}/resources/manifest.json"/>
+    <meta name="generator" content="AllTube Download ({$config->getAppVersion()})"/>
 </head>
 <body class="{$class}">
diff --git a/templates/info.tpl b/templates/info.tpl
index 07ae547..fce119a 100644
--- a/templates/info.tpl
+++ b/templates/info.tpl
@@ -76,7 +76,7 @@
                     <br/>
                 {/if}
                 {if $config->stream}
-                    <input type="checkbox" {if $config->stream != 'ask'}checked{/if} name="stream" id="stream"/>
+                    <input type="checkbox" {if $config->stream !== 'ask'}checked{/if} name="stream" id="stream"/>
                     <label for="stream">{t}Stream the video through the server{/t}</label>
                     <br/>
                     <br/>
diff --git a/tests/BaseTest.php b/tests/BaseTest.php
index d717b79..a377617 100644
--- a/tests/BaseTest.php
+++ b/tests/BaseTest.php
@@ -7,7 +7,7 @@
 namespace Alltube\Test;
 
 use Alltube\Config;
-use Exception;
+use Alltube\Exception\ConfigException;
 use PHPUnit\Framework\TestCase;
 
 /**
@@ -22,18 +22,12 @@ abstract class BaseTest extends TestCase
      */
     protected function getConfigFile()
     {
-        if (PHP_OS == 'WINNT') {
-            $configFile = 'config_test_windows.yml';
-        } else {
-            $configFile = 'config_test.yml';
-        }
-
-        return __DIR__ . '/../config/' . $configFile;
+        return __DIR__ . '/../config/config_test.yml';
     }
 
     /**
      * Prepare tests.
-     * @throws Exception
+     * @throws ConfigException
      */
     protected function setUp(): void
     {
diff --git a/tests/ConfigTest.php b/tests/ConfigTest.php
index 09374cf..e0fe7d8 100644
--- a/tests/ConfigTest.php
+++ b/tests/ConfigTest.php
@@ -7,7 +7,7 @@
 namespace Alltube\Test;
 
 use Alltube\Config;
-use Exception;
+use Alltube\Exception\ConfigException;
 
 /**
  * Unit tests for the Config class.
@@ -23,7 +23,7 @@ class ConfigTest extends BaseTest
 
     /**
      * Prepare tests.
-     * @throws Exception
+     * @throws ConfigException
      */
     protected function setUp(): void
     {
@@ -70,7 +70,7 @@ class ConfigTest extends BaseTest
         $this->assertIsArray($config->params);
         $this->assertIsString($config->youtubedl);
         $this->assertIsString($config->python);
-        $this->assertIsString($config->avconv);
+        $this->assertIsString($config->ffmpeg);
         $this->assertIsBool($config->convert);
         $this->assertIsBool($config->uglyUrls);
         $this->assertIsBool($config->stream);
@@ -82,7 +82,7 @@ class ConfigTest extends BaseTest
      * Test the setFile function.
      *
      * @return void
-     * @throws Exception
+     * @throws ConfigException
      */
     public function testSetFile()
     {
@@ -97,7 +97,7 @@ class ConfigTest extends BaseTest
      */
     public function testSetFileWithMissingFile()
     {
-        $this->expectException(Exception::class);
+        $this->expectException(ConfigException::class);
         Config::setFile('foo');
     }
 
@@ -105,7 +105,7 @@ class ConfigTest extends BaseTest
      * Test the setOptions function.
      *
      * @return void
-     * @throws Exception
+     * @throws ConfigException
      */
     public function testSetOptions()
     {
@@ -118,7 +118,7 @@ class ConfigTest extends BaseTest
      * Test the setOptions function.
      *
      * @return void
-     * @throws Exception
+     * @throws ConfigException
      */
     public function testSetOptionsWithoutUpdate()
     {
@@ -134,7 +134,7 @@ class ConfigTest extends BaseTest
      */
     public function testSetOptionsWithBadYoutubedl()
     {
-        $this->expectException(Exception::class);
+        $this->expectException(ConfigException::class);
         Config::setOptions(['youtubedl' => 'foo']);
     }
 
@@ -145,7 +145,7 @@ class ConfigTest extends BaseTest
      */
     public function testSetOptionsWithBadPython()
     {
-        $this->expectException(Exception::class);
+        $this->expectException(ConfigException::class);
         Config::setOptions(['python' => 'foo']);
     }
 
@@ -153,7 +153,7 @@ class ConfigTest extends BaseTest
      * Test the getInstance function with the CONVERT and PYTHON environment variables.
      *
      * @return void
-     * @throws Exception
+     * @throws ConfigException
      */
     public function testGetInstanceWithEnv()
     {
diff --git a/tests/ControllerTest.php b/tests/ControllerTest.php
index bd9f737..abb3756 100644
--- a/tests/ControllerTest.php
+++ b/tests/ControllerTest.php
@@ -9,13 +9,14 @@ namespace Alltube\Test;
 use Alltube\Controller\BaseController;
 use Alltube\Controller\DownloadController;
 use Alltube\Controller\FrontController;
+use Alltube\Exception\ConfigException;
 use Alltube\LocaleManager;
 use Alltube\ViewFactory;
-use Exception;
 use Slim\Container;
 use Slim\Http\Environment;
 use Slim\Http\Request;
 use Slim\Http\Response;
+use SmartyException;
 
 /**
  * Abstract class used by the controller tests.
@@ -51,7 +52,7 @@ abstract class ControllerTest extends BaseTest
 
     /**
      * Prepare tests.
-     * @throws Exception
+     * @throws ConfigException|SmartyException
      */
     protected function setUp(): void
     {
diff --git a/tests/ConvertedPlaylistArchiveStreamTest.php b/tests/ConvertedPlaylistArchiveStreamTest.php
index e8cb002..0ed373f 100644
--- a/tests/ConvertedPlaylistArchiveStreamTest.php
+++ b/tests/ConvertedPlaylistArchiveStreamTest.php
@@ -6,9 +6,9 @@
 
 namespace Alltube\Test;
 
+use Alltube\Config;
+use Alltube\Exception\ConfigException;
 use Alltube\Stream\ConvertedPlaylistArchiveStream;
-use Alltube\Video;
-use Exception;
 
 /**
  * Unit tests for the ConvertedPlaylistArchiveStream class.
@@ -18,14 +18,16 @@ class ConvertedPlaylistArchiveStreamTest extends StreamTest
 {
     /**
      * Prepare tests.
-     * @throws Exception
+     * @throws ConfigException
      */
     protected function setUp(): void
     {
         parent::setUp();
 
-        $video = new Video('https://www.youtube.com/playlist?list=PL1j4Ff8cAqPu5iowaeUAY8lRgkfT4RybJ');
+        $config = Config::getInstance();
+        $downloader = $config->getDownloader();
+        $video = $downloader->getVideo('https://www.youtube.com/playlist?list=PL1j4Ff8cAqPu5iowaeUAY8lRgkfT4RybJ');
 
-        $this->stream = new ConvertedPlaylistArchiveStream($video);
+        $this->stream = new ConvertedPlaylistArchiveStream($downloader, $video);
     }
 }
diff --git a/tests/DownloadControllerTest.php b/tests/DownloadControllerTest.php
index 761ba21..019122b 100644
--- a/tests/DownloadControllerTest.php
+++ b/tests/DownloadControllerTest.php
@@ -8,7 +8,11 @@ namespace Alltube\Test;
 
 use Alltube\Config;
 use Alltube\Controller\DownloadController;
-use Exception;
+use Alltube\Exception\ConfigException;
+use Alltube\Library\Exception\EmptyUrlException;
+use Alltube\Library\Exception\RemuxException;
+use Alltube\Library\Exception\YoutubedlException;
+use SmartyException;
 
 /**
  * Unit tests for the FrontController class.
@@ -18,7 +22,7 @@ class DownloadControllerTest extends ControllerTest
 {
     /**
      * Prepare tests.
-     * @throws Exception
+     * @throws ConfigException|SmartyException
      */
     protected function setUp(): void
     {
@@ -64,7 +68,7 @@ class DownloadControllerTest extends ControllerTest
      * Test the download() function with streams enabled.
      *
      * @return void
-     * @throws Exception
+     * @throws ConfigException
      */
     public function testDownloadWithStream()
     {
@@ -80,7 +84,7 @@ class DownloadControllerTest extends ControllerTest
      * Test the download() function with an M3U stream.
      *
      * @return void
-     * @throws Exception
+     * @throws ConfigException
      */
     public function testDownloadWithM3uStream()
     {
@@ -100,7 +104,7 @@ class DownloadControllerTest extends ControllerTest
      * Test the download() function with an RTMP stream.
      *
      * @return void
-     * @throws Exception
+     * @throws ConfigException
      */
     public function testDownloadWithRtmpStream()
     {
@@ -118,7 +122,7 @@ class DownloadControllerTest extends ControllerTest
      * Test the download() function with a remuxed video.
      *
      * @return void
-     * @throws Exception
+     * @throws ConfigException
      */
     public function testDownloadWithRemux()
     {
@@ -140,7 +144,8 @@ class DownloadControllerTest extends ControllerTest
      */
     public function testDownloadWithRemuxDisabled()
     {
-        $this->assertRequestIsServerError(
+        $this->expectException(RemuxException::class);
+        $this->getRequestResult(
             'download',
             [
                 'url'    => 'https://www.youtube.com/watch?v=M7IpKCZ47pU',
@@ -166,7 +171,8 @@ class DownloadControllerTest extends ControllerTest
      */
     public function testDownloadWithError()
     {
-        $this->assertRequestIsServerError('download', ['url' => 'http://example.com/foo']);
+        $this->expectException(YoutubedlException::class);
+        $this->getRequestResult('download', ['url' => 'http://example.com/foo']);
     }
 
     /**
@@ -177,7 +183,8 @@ class DownloadControllerTest extends ControllerTest
      */
     public function testDownloadWithEmptyUrl()
     {
-        $this->assertRequestIsServerError(
+        $this->expectException(EmptyUrlException::class);
+        $this->getRequestResult(
             'download',
             ['url' => 'https://www.youtube.com/playlist?list=PLgdySZU6KUXL_8Jq5aUkyNV7wCa-4wZsC']
         );
@@ -188,7 +195,7 @@ class DownloadControllerTest extends ControllerTest
      *
      * @return void
      * @requires OS Linux
-     * @throws Exception
+     * @throws ConfigException
      */
     public function testDownloadWithPlaylist()
     {
@@ -204,7 +211,7 @@ class DownloadControllerTest extends ControllerTest
      * Test the download() function with an advanced conversion.
      *
      * @return void
-     * @throws Exception
+     * @throws ConfigException
      */
     public function testDownloadWithAdvancedConversion()
     {
diff --git a/tests/FrontControllerTest.php b/tests/FrontControllerTest.php
index 92e4824..0e2ffe0 100644
--- a/tests/FrontControllerTest.php
+++ b/tests/FrontControllerTest.php
@@ -8,9 +8,12 @@ namespace Alltube\Test;
 
 use Alltube\Config;
 use Alltube\Controller\FrontController;
+use Alltube\Exception\ConfigException;
+use Alltube\Library\Exception\AlltubeLibraryException;
 use Exception;
 use Slim\Http\Environment;
 use Slim\Http\Request;
+use SmartyException;
 
 /**
  * Unit tests for the FrontController class.
@@ -25,7 +28,7 @@ class FrontControllerTest extends ControllerTest
 
     /**
      * Prepare tests.
-     * @throws Exception
+     * @throws ConfigException|SmartyException
      */
     protected function setUp(): void
     {
@@ -48,7 +51,7 @@ class FrontControllerTest extends ControllerTest
      * Test the constructor with streams enabled.
      *
      * @return void
-     * @throws Exception
+     * @throws ConfigException
      */
     public function testConstructorWithStream()
     {
@@ -99,7 +102,7 @@ class FrontControllerTest extends ControllerTest
      */
     public function testPassword()
     {
-        $this->assertRequestIsOk('password');
+        $this->assertRequestIsClientError('password');
     }
 
     /**
@@ -128,7 +131,7 @@ class FrontControllerTest extends ControllerTest
      *
      * @return void
      * @requires download
-     * @throws Exception
+     * @throws ConfigException
      */
     public function testInfoWithAudio()
     {
@@ -145,7 +148,7 @@ class FrontControllerTest extends ControllerTest
      *
      * @return void
      * @requires download
-     * @throws Exception
+     * @throws ConfigException
      */
     public function testInfoWithVimeoAudio()
     {
@@ -160,7 +163,7 @@ class FrontControllerTest extends ControllerTest
      *
      * @return void
      * @requires download
-     * @throws Exception
+     * @throws ConfigException
      */
     public function testInfoWithUnconvertedAudio()
     {
@@ -180,6 +183,7 @@ class FrontControllerTest extends ControllerTest
      *
      * @return void
      * @requires download
+     * @throws AlltubeLibraryException
      */
     public function testInfoWithPassword()
     {
@@ -199,8 +203,8 @@ class FrontControllerTest extends ControllerTest
      */
     public function testInfoWithMissingPassword()
     {
-        $this->assertRequestIsOk('info', ['url' => 'http://vimeo.com/68375962']);
-        $this->assertRequestIsOk('info', ['url' => 'http://vimeo.com/68375962', 'audio' => true]);
+        $this->assertRequestIsClientError('info', ['url' => 'http://vimeo.com/68375962']);
+        $this->assertRequestIsClientError('info', ['url' => 'http://vimeo.com/68375962', 'audio' => true]);
     }
 
     /**
@@ -208,7 +212,7 @@ class FrontControllerTest extends ControllerTest
      *
      * @return void
      * @requires download
-     * @throws Exception
+     * @throws ConfigException
      */
     public function testInfoWithStream()
     {
diff --git a/tests/JsonControllerTest.php b/tests/JsonControllerTest.php
index d2d6c3e..438b482 100644
--- a/tests/JsonControllerTest.php
+++ b/tests/JsonControllerTest.php
@@ -7,7 +7,9 @@
 namespace Alltube\Test;
 
 use Alltube\Controller\JsonController;
-use Exception;
+use Alltube\Exception\ConfigException;
+use Alltube\Library\Exception\YoutubedlException;
+use SmartyException;
 
 /**
  * Unit tests for the FrontController class.
@@ -16,7 +18,7 @@ class JsonControllerTest extends ControllerTest
 {
     /**
      * Prepare tests.
-     * @throws Exception
+     * @throws ConfigException|SmartyException
      */
     protected function setUp(): void
     {
@@ -44,7 +46,8 @@ class JsonControllerTest extends ControllerTest
      */
     public function testJsonWithError()
     {
-        $this->assertRequestIsServerError('json', ['url' => 'http://example.com/foo']);
+        $this->expectException(YoutubedlException::class);
+        $this->getRequestResult('json', ['url' => 'http://example.com/foo']);
     }
 
     /**
diff --git a/tests/PlaylistArchiveStreamTest.php b/tests/PlaylistArchiveStreamTest.php
index f02a6ea..29b103f 100644
--- a/tests/PlaylistArchiveStreamTest.php
+++ b/tests/PlaylistArchiveStreamTest.php
@@ -6,9 +6,9 @@
 
 namespace Alltube\Test;
 
+use Alltube\Config;
+use Alltube\Exception\ConfigException;
 use Alltube\Stream\PlaylistArchiveStream;
-use Alltube\Video;
-use Exception;
 
 /**
  * Unit tests for the PlaylistArchiveStream class.
@@ -18,14 +18,16 @@ class PlaylistArchiveStreamTest extends StreamTest
 {
     /**
      * Prepare tests.
-     * @throws Exception
+     * @throws ConfigException
      */
     protected function setUp(): void
     {
         parent::setUp();
 
-        $video = new Video('https://www.youtube.com/playlist?list=PL1j4Ff8cAqPu5iowaeUAY8lRgkfT4RybJ');
+        $config = Config::getInstance();
+        $downloader = $config->getDownloader();
+        $video = $downloader->getVideo('https://www.youtube.com/playlist?list=PL1j4Ff8cAqPu5iowaeUAY8lRgkfT4RybJ');
 
-        $this->stream = new PlaylistArchiveStream($video);
+        $this->stream = new PlaylistArchiveStream($downloader, $video);
     }
 }
diff --git a/tests/VideoStubsTest.php b/tests/VideoStubsTest.php
index 51f758d..789e839 100644
--- a/tests/VideoStubsTest.php
+++ b/tests/VideoStubsTest.php
@@ -6,36 +6,51 @@
 
 namespace Alltube\Test;
 
-use Alltube\Video;
+use Alltube\Config;
+use Alltube\Exception\ConfigException;
+use Alltube\Library\Downloader;
+use Alltube\Library\Exception\AlltubeLibraryException;
+use Alltube\Library\Exception\PopenStreamException;
+use Alltube\Library\Video;
 use Mockery;
 use phpmock\mockery\PHPMockery;
-use Exception;
 
 /**
  * Unit tests for the Video class.
  * They are in a separate file so they can safely replace PHP functions with stubs.
+ *
+ * @requires download
  */
 class VideoStubsTest extends BaseTest
 {
     /**
-     * Video URL used in many tests.
+     * Video used in many tests.
      *
      * @var Video
      */
     private $video;
 
+    /**
+     * Downloader instance used in tests.
+     *
+     * @var Downloader
+     */
+    private $downloader;
+
     /**
      * Initialize properties used by test.
-     * @throws Exception
+     * @throws ConfigException
      */
     protected function setUp(): void
     {
         parent::setUp();
 
-        PHPMockery::mock('Alltube', 'popen');
-        PHPMockery::mock('Alltube', 'fopen');
+        PHPMockery::mock('Alltube\Library', 'popen');
+        PHPMockery::mock('Alltube\Library', 'fopen');
 
-        $this->video = new Video('https://www.youtube.com/watch?v=XJC9_JkzugE');
+        $config = Config::getInstance();
+        $this->downloader = $config->getDownloader();
+        $this->video = $this->downloader->getVideo('https://www.youtube.com/watch?v=XJC9_JkzugE');
     }
 
     /**
@@ -52,55 +67,60 @@ class VideoStubsTest extends BaseTest
      * Test getAudioStream function with a buggy popen.
      *
      * @return void
+     * @throws AlltubeLibraryException
      */
     public function testGetAudioStreamWithPopenError()
     {
-        $this->expectException(Exception::class);
-        $this->video->getAudioStream();
+        $this->expectException(PopenStreamException::class);
+        $this->downloader->getAudioStream($this->video);
     }
 
     /**
      * Test getM3uStream function with a buggy popen.
      *
      * @return void
+     * @throws AlltubeLibraryException
      */
     public function testGetM3uStreamWithPopenError()
     {
-        $this->expectException(Exception::class);
-        $this->video->getM3uStream();
+        $this->expectException(PopenStreamException::class);
+        $this->downloader->getM3uStream($this->video);
     }
 
     /**
      * Test getRtmpStream function with a buggy popen.
      *
      * @return void
+     * @throws AlltubeLibraryException
      */
     public function testGetRtmpStreamWithPopenError()
     {
-        $this->expectException(Exception::class);
-        $this->video->getRtmpStream();
+        $this->expectException(PopenStreamException::class);
+        $this->downloader->getRtmpStream($this->video);
     }
 
     /**
      * Test getRemuxStream function with a buggy popen.
      *
      * @return void
+     * @throws AlltubeLibraryException
      */
     public function testGetRemuxStreamWithPopenError()
     {
-        $this->expectException(Exception::class);
+        $this->expectException(PopenStreamException::class);
         $video = $this->video->withFormat('bestvideo+bestaudio');
-        $video->getRemuxStream();
+        $this->downloader->getRemuxStream($video);
     }
 
     /**
      * Test getConvertedStream function with a buggy popen.
      *
      * @return void
+     * @throws AlltubeLibraryException
      */
     public function testGetConvertedStreamWithPopenError()
     {
-        $this->expectException(Exception::class);
-        $this->video->getConvertedStream(32, 'flv');
+        $this->expectException(PopenStreamException::class);
+        $this->downloader->getConvertedStream($this->video, 32, 'flv');
     }
 }
diff --git a/tests/VideoTest.php b/tests/VideoTest.php
index e6d4552..7f58516 100644
--- a/tests/VideoTest.php
+++ b/tests/VideoTest.php
@@ -7,26 +7,61 @@
 namespace Alltube\Test;
 
 use Alltube\Config;
-use Alltube\Exception\EmptyUrlException;
-use Alltube\Exception\PasswordException;
-use Alltube\Video;
-use Exception;
+use Alltube\Exception\ConfigException;
+use Alltube\Library\Downloader;
+use Alltube\Library\Exception\AlltubeLibraryException;
+use Alltube\Library\Exception\AvconvException;
+use Alltube\Library\Exception\InvalidProtocolConversionException;
+use Alltube\Library\Exception\PasswordException;
+use Alltube\Library\Exception\PlaylistConversionException;
+use Alltube\Library\Exception\RemuxException;
+use Alltube\Library\Exception\WrongPasswordException;
+use Alltube\Library\Exception\YoutubedlException;
+use Alltube\Library\Video;
 
 /**
  * Unit tests for the Video class.
  * @requires download
+ * @todo Split Downloader and Video tests.
  */
 class VideoTest extends BaseTest
 {
+    /**
+     * Downloader instance used in tests.
+     *
+     * @var Downloader
+     */
+    private $downloader;
+
+    /**
+     * Video format used in tests.
+     *
+     * @var string
+     */
+    private $format;
+
+    /**
+     * Prepare tests.
+     * @throws ConfigException
+     */
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $config = Config::getInstance();
+        $this->downloader = $config->getDownloader();
+        $this->format = 'best';
+    }
+
     /**
      * Test getExtractors function.
      *
      * @return void
-     * @throws PasswordException
+     * @throws AlltubeLibraryException
      */
     public function testGetExtractors()
     {
-        $this->assertContains('youtube', Video::getExtractors());
+        $this->assertContains('youtube', $this->downloader->getExtractors());
     }
 
     /**
@@ -39,8 +74,7 @@ class VideoTest extends BaseTest
      * @param string $domain Domain
      *
      * @return void
-     * @throws PasswordException
-     * @throws EmptyUrlException
+     * @throws AlltubeLibraryException
      * @dataProvider urlProvider
      * @dataProvider m3uUrlProvider
      * @dataProvider remuxUrlProvider
@@ -52,7 +86,7 @@ class VideoTest extends BaseTest
         /* @scrutinizer ignore-unused */ $extension,
         $domain
     ) {
-        $video = new Video($url, $format);
+        $video = new Video($this->downloader, $url, $format);
         foreach ($video->getUrl() as $videoURL) {
             $this->assertStringContainsString($domain, $videoURL);
         }
@@ -62,12 +96,11 @@ class VideoTest extends BaseTest
      * Test getUrl function with a protected video.
      *
      * @return void
-     * @throws EmptyUrlException
-     * @throws PasswordException
+     * @throws AlltubeLibraryException
      */
     public function testgetUrlWithPassword()
     {
-        $video = new Video('http://vimeo.com/68375962', 'best', 'youtube-dl');
+        $video = new Video($this->downloader, 'http://vimeo.com/68375962', 'best', 'youtube-dl');
         foreach ($video->getUrl() as $videoURL) {
             $this->assertStringContainsString('vimeocdn.com', $videoURL);
         }
@@ -77,13 +110,12 @@ class VideoTest extends BaseTest
      * Test getUrl function with a protected video and no password.
      *
      * @return void
-     * @throws EmptyUrlException
-     * @throws PasswordException
+     * @throws AlltubeLibraryException
      */
     public function testgetUrlWithMissingPassword()
     {
-        $this->expectException(Exception::class);
-        $video = new Video('http://vimeo.com/68375962');
+        $this->expectException(PasswordException::class);
+        $video = new Video($this->downloader, 'http://vimeo.com/68375962', $this->format);
         $video->getUrl();
     }
 
@@ -91,13 +123,12 @@ class VideoTest extends BaseTest
      * Test getUrl function with a protected video and a wrong password.
      *
      * @return void
-     * @throws EmptyUrlException
-     * @throws PasswordException
+     * @throws AlltubeLibraryException
      */
     public function testgetUrlWithWrongPassword()
     {
-        $this->expectException(Exception::class);
-        $video = new Video('http://vimeo.com/68375962', 'best', 'foo');
+        $this->expectException(WrongPasswordException::class);
+        $video = new Video($this->downloader, 'http://vimeo.com/68375962', 'best', 'foo');
         $video->getUrl();
     }
 
@@ -107,14 +138,13 @@ class VideoTest extends BaseTest
      * @param string $url URL
      *
      * @return void
-     * @throws EmptyUrlException
-     * @throws PasswordException
-     * @dataProvider      ErrorUrlProvider
+     * @throws AlltubeLibraryException
+     * @dataProvider ErrorUrlProvider
      */
     public function testgetUrlError($url)
     {
-        $this->expectException(Exception::class);
-        $video = new Video($url);
+        $this->expectException(YoutubedlException::class);
+        $video = new Video($this->downloader, $url, $this->format);
         $video->getUrl();
     }
 
@@ -224,13 +254,13 @@ class VideoTest extends BaseTest
      * @param string $format Format
      *
      * @return void
+     * @throws AlltubeLibraryException
      * @dataProvider urlProvider
      * @dataProvider m3uUrlProvider
-     * @throws PasswordException
      */
     public function testGetJson($url, $format)
     {
-        $video = new Video($url, $format);
+        $video = new Video($this->downloader, $url, $format);
         $info = $video->getJson();
         $this->assertObjectHasAttribute('webpage_url', $info);
         $this->assertObjectHasAttribute('url', $info);
@@ -246,13 +276,13 @@ class VideoTest extends BaseTest
      * @param string $url URL
      *
      * @return void
-     * @dataProvider      ErrorURLProvider
-     * @throws PasswordException
+     * @throws AlltubeLibraryException
+     * @dataProvider ErrorURLProvider
      */
     public function testGetJsonError($url)
     {
-        $this->expectException(Exception::class);
-        $video = new Video($url);
+        $this->expectException(YoutubedlException::class);
+        $video = new Video($this->downloader, $url, $this->format);
         $video->getJson();
     }
 
@@ -265,14 +295,14 @@ class VideoTest extends BaseTest
      * @param string $extension File extension
      *
      * @return void
+     * @throws AlltubeLibraryException
      * @dataProvider urlProvider
      * @dataProvider m3uUrlProvider
      * @dataProvider remuxUrlProvider
-     * @throws PasswordException
      */
     public function testGetFilename($url, $format, $filename, $extension)
     {
-        $video = new Video($url, $format);
+        $video = new Video($this->downloader, $url, $format);
         $this->assertEquals($video->getFilename(), $filename . '.' . $extension);
     }
 
@@ -282,13 +312,13 @@ class VideoTest extends BaseTest
      * @param string $url URL
      *
      * @return void
-     * @dataProvider      ErrorUrlProvider
-     * @throws PasswordException
+     * @throws AlltubeLibraryException
+     * @dataProvider ErrorUrlProvider
      */
     public function testGetFilenameError($url)
     {
-        $this->expectException(Exception::class);
-        $video = new Video($url);
+        $this->expectException(YoutubedlException::class);
+        $video = new Video($this->downloader, $url, $this->format);
         $video->getFilename();
     }
 
@@ -300,73 +330,80 @@ class VideoTest extends BaseTest
      *
      * @return void
      * @dataProvider urlProvider
-     * @throws Exception
+     * @throws AlltubeLibraryException
      */
     public function testGetAudioStream($url, $format)
     {
-        $video = new Video($url, $format);
-        $this->assertStream($video->getAudioStream());
+        $video = new Video($this->downloader, $url, $format);
+        $this->assertStream($this->downloader->getAudioStream($video));
     }
 
     /**
-     * Test getAudioStream function without avconv.
+     * Test getAudioStream function without ffmpeg.
      *
-     * @param string $url    URL
+     * @param string $url URL
      * @param string $format Format
      *
      * @return void
-     * @dataProvider      urlProvider
+     * @throws AlltubeLibraryException|ConfigException
+     * @dataProvider urlProvider
      */
-    public function testGetAudioStreamAvconvError($url, $format)
+    public function testGetAudioStreamFfmpegError($url, $format)
     {
-        $this->expectException(Exception::class);
-        Config::setOptions(['avconv' => 'foobar']);
+        $this->expectException(AvconvException::class);
+        Config::setOptions(['ffmpeg' => 'foobar']);
+        $config = Config::getInstance();
+        $downloader = $config->getDownloader();
 
-        $video = new Video($url, $format);
-        $video->getAudioStream();
+        $video = new Video($this->downloader, $url, $format, $this->format);
+        $downloader->getAudioStream($video);
     }
 
     /**
      * Test getAudioStream function with a M3U8 file.
      *
-     * @param string $url    URL
+     * @param string $url URL
      * @param string $format Format
      *
      * @return void
+     * @throws AlltubeLibraryException
      * @dataProvider m3uUrlProvider
      */
     public function testGetAudioStreamM3uError($url, $format)
     {
-        $this->expectException(Exception::class);
-        $video = new Video($url, $format);
-        $video->getAudioStream();
+        $this->expectException(InvalidProtocolConversionException::class);
+        $video = new Video($this->downloader, $url, $format);
+        $this->downloader->getAudioStream($video);
     }
 
     /**
      * Test getAudioStream function with a DASH URL.
      *
      * @return void
+     * @throws AlltubeLibraryException
      */
     public function testGetAudioStreamDashError()
     {
-        $this->expectException(Exception::class);
-        $video = new Video('https://vimeo.com/251997032', 'bestaudio/best');
-        $video->getAudioStream();
+        $this->expectException(InvalidProtocolConversionException::class);
+        $video = new Video($this->downloader, 'https://vimeo.com/251997032', 'bestaudio/best');
+        $this->downloader->getAudioStream($video);
     }
 
     /**
      * Test getAudioStream function with a playlist.
      *
      * @return void
+     * @throws AlltubeLibraryException
      */
     public function testGetAudioStreamPlaylistError()
     {
-        $this->expectException(Exception::class);
+        $this->expectException(PlaylistConversionException::class);
         $video = new Video(
+            $this->downloader,
             'https://www.youtube.com/playlist?list=PLgdySZU6KUXL_8Jq5aUkyNV7wCa-4wZsC',
             'best'
         );
-        $video->getAudioStream();
+        $this->downloader->getAudioStream($video);
     }
 
     /**
@@ -390,12 +427,12 @@ class VideoTest extends BaseTest
      *
      * @return void
      * @dataProvider m3uUrlProvider
-     * @throws Exception
+     * @throws AlltubeLibraryException
      */
     public function testGetM3uStream($url, $format)
     {
-        $video = new Video($url, $format);
-        $this->assertStream($video->getM3uStream());
+        $video = new Video($this->downloader, $url, $format);
+        $this->assertStream($this->downloader->getM3uStream($video));
     }
 
     /**
@@ -406,28 +443,29 @@ class VideoTest extends BaseTest
      *
      * @return void
      * @dataProvider remuxUrlProvider
-     * @throws Exception
+     * @throws AlltubeLibraryException
      */
     public function testGetRemuxStream($url, $format)
     {
-        $video = new Video($url, $format);
-        $this->assertStream($video->getRemuxStream());
+        $video = new Video($this->downloader, $url, $format);
+        $this->assertStream($this->downloader->getRemuxStream($video));
     }
 
     /**
      * Test getRemuxStream function with a video with only one URL.
      *
-     * @param string $url    URL
+     * @param string $url URL
      * @param string $format Format
      *
      * @return void
+     * @throws AlltubeLibraryException
      * @dataProvider urlProvider
      */
     public function testGetRemuxStreamWithWrongVideo($url, $format)
     {
-        $this->expectException(Exception::class);
-        $video = new Video($url, $format);
-        $video->getRemuxStream();
+        $this->expectException(RemuxException::class);
+        $video = new Video($this->downloader, $url, $format);
+        $this->downloader->getRemuxStream($video);
     }
 
     /**
@@ -437,65 +475,69 @@ class VideoTest extends BaseTest
      * @param string $format Format
      *
      * @return void
+     * @throws AlltubeLibraryException
      * @dataProvider rtmpUrlProvider
-     * @throws Exception
      */
     public function testGetRtmpStream($url, $format)
     {
         $this->markTestIncomplete('We need to find another RTMP video.');
 
-        $video = new Video($url, $format);
+        $video = new Video($this->downloader, $url, $format);
 
-        $this->assertStream($video->getRtmpStream());
+        $this->assertStream($this->downloader->getRtmpStream($video));
     }
 
     /**
-     * Test getM3uStream function without avconv.
+     * Test getM3uStream function without ffmpeg.
      *
-     * @param string $url    URL
+     * @param string $url URL
      * @param string $format Format
      *
      * @return void
+     * @throws AlltubeLibraryException|ConfigException
      * @dataProvider m3uUrlProvider
      */
-    public function testGetM3uStreamAvconvError($url, $format)
+    public function testGetM3uStreamFfmpegError($url, $format)
     {
-        $this->expectException(Exception::class);
-        Config::setOptions(['avconv' => 'foobar']);
+        $this->expectException(AvconvException::class);
+        Config::setOptions(['ffmpeg' => 'foobar']);
+        $config = Config::getInstance();
+        $downloader = $config->getDownloader();
 
-        $video = new Video($url, $format);
-        $video->getM3uStream();
+        $video = new Video($downloader, $url, $format);
+        $downloader->getM3uStream($video);
     }
 
     /**
-     * Test getConvertedStream function without avconv.
+     * Test getConvertedStream function without ffmpeg.
      *
      * @param string $url URL
      * @param string $format Format
      *
      * @return void
      * @dataProvider urlProvider
-     * @throws Exception
+     * @throws AlltubeLibraryException
      */
     public function testGetConvertedStream($url, $format)
     {
-        $video = new Video($url, $format);
-        $this->assertStream($video->getConvertedStream(32, 'flv'));
+        $video = new Video($this->downloader, $url, $format);
+        $this->assertStream($this->downloader->getConvertedStream($video, 32, 'flv'));
     }
 
     /**
      * Test getConvertedStream function with a M3U8 file.
      *
-     * @param string $url    URL
+     * @param string $url URL
      * @param string $format Format
      *
      * @return void
+     * @throws AlltubeLibraryException
      * @dataProvider m3uUrlProvider
      */
     public function testGetConvertedStreamM3uError($url, $format)
     {
-        $this->expectException(Exception::class);
-        $video = new Video($url, $format);
-        $video->getConvertedStream(32, 'flv');
+        $this->expectException(InvalidProtocolConversionException::class);
+        $video = new Video($this->downloader, $url, $format);
+        $this->downloader->getConvertedStream($video, 32, 'flv');
     }
 }
diff --git a/tests/YoutubeChunkStreamTest.php b/tests/YoutubeChunkStreamTest.php
index 41a2f38..aec785d 100644
--- a/tests/YoutubeChunkStreamTest.php
+++ b/tests/YoutubeChunkStreamTest.php
@@ -6,9 +6,10 @@
 
 namespace Alltube\Test;
 
+use Alltube\Config;
+use Alltube\Exception\ConfigException;
+use Alltube\Library\Exception\AlltubeLibraryException;
 use Alltube\Stream\YoutubeChunkStream;
-use Alltube\Video;
-use Exception;
 
 /**
  * Unit tests for the YoutubeChunkStream class.
@@ -18,14 +19,17 @@ class YoutubeChunkStreamTest extends StreamTest
 {
     /**
      * Prepare tests.
-     * @throws Exception
+     * @throws ConfigException
+     * @throws AlltubeLibraryException
      */
     protected function setUp(): void
     {
         parent::setUp();
 
-        $video = new Video('https://www.youtube.com/watch?v=dQw4w9WgXcQ');
+        $config = Config::getInstance();
+        $downloader = $config->getDownloader();
+        $video = $downloader->getVideo('https://www.youtube.com/watch?v=dQw4w9WgXcQ');
 
-        $this->stream = new YoutubeChunkStream($video->getHttpResponse());
+        $this->stream = new YoutubeChunkStream($downloader->getHttpResponse($video));
     }
 }
diff --git a/tests/YoutubeStreamTest.php b/tests/YoutubeStreamTest.php
index b8b4d13..d551e0c 100644
--- a/tests/YoutubeStreamTest.php
+++ b/tests/YoutubeStreamTest.php
@@ -6,9 +6,10 @@
 
 namespace Alltube\Test;
 
+use Alltube\Config;
+use Alltube\Exception\ConfigException;
+use Alltube\Library\Exception\AlltubeLibraryException;
 use Alltube\Stream\YoutubeStream;
-use Alltube\Video;
-use Exception;
 
 /**
  * Unit tests for the YoutubeStream class.
@@ -18,15 +19,17 @@ class YoutubeStreamTest extends StreamTest
 {
     /**
      * Prepare tests.
-     * @throws Exception
+     * @throws ConfigException|AlltubeLibraryException
      */
     protected function setUp(): void
     {
         parent::setUp();
 
-        $video = new Video('https://www.youtube.com/watch?v=dQw4w9WgXcQ', '135');
+        $config = Config::getInstance();
+        $downloader = $config->getDownloader();
+        $video = $downloader->getVideo('https://www.youtube.com/watch?v=dQw4w9WgXcQ', '135');
 
-        $this->stream = new YoutubeStream($video);
+        $this->stream = new YoutubeStream($downloader, $video);
     }
 
     /**