mirror of
https://github.com/mpv-player/mpv
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4544fb0856
Just "mpv file.mkv --play-direction=backward" did not work, because backward demuxing from the very end was not implemented. This is another corner case, because the resume mechanism so far requires a packet "position" (dts or pos) as reference. Now "EOF" is another possible reference. Also, the backstep mechanism could cause streams to find different playback start positions, basically leading to random playback start (instead of what you specified with --start). This happens only if backstep seeks are involved (i.e. no cached data yet), but since this is usually the case at playback start, it always happened. It was racy too, because it depended on the order the decoders on other threads requested new data. The comment below "resume_earlier" has some more blabla. Some other details are changed. I'm giving up on the "from_cache" parameter, and don't try to detect the situation when the demuxer does not seek properly. Instead, always seek back, hopefully some more. Instead of trying to adjust the backstep seek target by a random value of 1.0 seconds. Instead, always rely on the random value provided by the user via --demuxer-backward-playback-step. If the demuxer should really get "stuck" and somehow miss the seek target badly, or the user sets the option value to 0, then the demuxer will not make any progress and just eat CPU. (Although due to backward seek semantics used for backstep seeks, even a very small seek step size will work. Just not 0.) It seems this also fixes backstepping correctly when the initial seek ended at the last keyframe range. (The explanation above was about the case when it ends at EOF. These two cases are different. In the former, you just need to step to the previous keyframe range, which was broken because it didn't always react correctly to reaching EOF. In the latter, you need to do a separate search for the last keyframe.) |
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| .. | ||
| af.rst | ||
| ao.rst | ||
| changes.rst | ||
| encode.rst | ||
| input.rst | ||
| ipc.rst | ||
| javascript.rst | ||
| libmpv.rst | ||
| lua.rst | ||
| mpv.rst | ||
| options.rst | ||
| osc.rst | ||
| stats.rst | ||
| vf.rst | ||
| vo.rst | ||