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Minimize frame drops on resuming normal speed 

Introduces slight a-v desynchronisation in speedup state, which is not
really noticeable. On resuming normalspeed a-v gets synchronized once
again.
This commit is contained in:
zenyd 2017-09-26 15:36:50 +02:00
parent bd746aa3dd
commit 5793184c2d
2 changed files with 10 additions and 2 deletions
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6
README.md
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@ -1,5 +1,5 @@
## speed-transition
This is a lua script for the mpv media player. The purpose of this script is to speed up the video if no subtitles are visible for a certain amount of (user configurable) time. It is inspired by [the speed-between-subs](https://gist.github.com/bitingsock/47c5ba6466c63c68bcf991dd376f1d18) script.
This is a lua script for the mpv media player. The purpose of this script is to speed up the video if no subtitles are visible for a certain amount of (user configurable) time. It is inspired by the [speed-between-subs](https://gist.github.com/bitingsock/47c5ba6466c63c68bcf991dd376f1d18) script.
### How it works
The script looks for the next subtitle and if it is ahead by 5 (default) seconds the video gets sped up and resumes normal playback just before the subtitle becomes visible. This is done to prevent audio glitches when speech starts.
@ -9,7 +9,9 @@ For the script to work it is necessary to have an appropriate 'text' subtitle se
If you want to use it with local files it is necessary to either have `--cache=yes` or `--demuxer-readahead-secs=10` options enabled in your config/cli. A value of `demuxer-readahead-secs>=10` is recommended. The same applies to `--cache-secs` option if it has been set.
The script has sensible defaults, but if you want to change the `lookahead` value take care to not set it larger than what the buffers can provide. This applies to embedded subtitles and not external.
The script works best in `video-sync=audio` mode (the default in mpv), because it will then be able to minimize frame drops on speed transition from high->normal. Stutter-free playback is the result.
Sensible defaults have been set, but if you want to change the `lookahead` value take care to not set it larger than what the buffers can provide. This applies to embedded subtitles and not external.
Key Bind|Effect
--------|------

6
speed-transition.lua
View File

@ -18,6 +18,9 @@ end
function restore_normalspeed()
mp.set_property("speed", normalspeed)
if mp.get_property_native("video-sync") == "desync" then
mp.set_property("video-sync", "audio")
end
end
function check_should_speedup()
@ -78,6 +81,9 @@ function speed_transition(subtext, sub)
if sub == "" then
nextsub, shouldspeedup = check_should_speedup()
if shouldspeedup then
if mp.get_property_native("video-sync") == "audio" then
mp.set_property("video-sync", "desync")
end
normalspeed = mp.get_property_native("speed")
mp.set_property("speed", speedup)
add_timers(nextsub)