[Webkit-unassigned] [Bug 198053] [GStreamer][MSE] Desync between audio/video

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon Jun 17 15:46:55 PDT 2019


--- Comment #7 from Michael Catanzaro <mcatanzaro at igalia.com> ---
(In reply to Michael Catanzaro from comment #2)
> I'm not sure if the delay increases as the video progresses, or if it just
> starts out really bad.

The former. I'm pretty sure the video is correct. Perhaps the audio is playing just slightly too fast and so the difference between the video and audio increases incrementally as playback continues. I agree that around 2-3m it becomes noticeable. Later it becomes more and more obvious. Just reproduced on https://www.youtube.com/watch?v=zxT8CM8XntA.

(In reply to Philippe Normand from comment #6)
> In Ephy TP it starts to be noticeable around 2:45. I can't reproduce the
> issue in MiniBrowser from ToT...

Using our flatpak environment that's based on the GNOME runtime? We seem to have a frequently-recurring problem with multimedia bugs that occur for our users but aren't reproducible in our development environment. I think we're shooting ourselves in the foot by building our own GStreamer in org.webkit.CommonModules.yaml. I suspect removing the custom multimedia stuff and getting it from the upstream runtime would go a long way towards helping to reproduce such issues.

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