During a running mp4 video in Intel graphics i965 (Ubuntu 18.04 Unity, 
Ubuntu 20.04 MATE), mpv and vlc loose video frames (hardware 
accelerated) when switching to another workscreen in Compiz and outputs 
stuttering scaled videos (plug-in "scale" with overview "initiate window 
selection for all windows") whereas gstreamer-based (1.18) Video players 
(e.g. parole) do not have this problem.

The warning message (mpv) and error message (vlc) are then:

mpv:
Audio/Video desynchronisation detected! Possible reasons include too slow
hardware, temporary CPU spikes, broken drivers, and broken files. Audio
position will not match to the video (see A-V status field).

AV: 00:00:36 / 00:01:57 (31%) A-V:  0.000 Dropped: 422


vlc (after a while):
[h264 @ 0x7fc024cd9f40] co located POCs unavailable


Am 23.06.21 um 04:01 schrieb Daniel van Vugt:
> Thanks for the detailed document but concise means short. Please
> describe the problem in one or two sentences.
>
> As I understand it you are talking about intel_gpu_top reporting numbers
> you don't expect, but that in itself is not a bug.
>

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https://bugs.launchpad.net/bugs/1931890

Title:
  Problem with 3D Render Engine in VAAPI

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