Comment 17 for bug 1826201

OK thank you. everything now works as already mentioned.
The output from mpv when playing an mp4 video is shown below, if it is still required.

Playing: Dream.mp4
 (+) Video --vid=1 (*) (h264 1280x720 25.000fps)
 (+) Audio --aid=1 --alang=eng (*) (aac 2ch 44100Hz)
[vo/gpu/vaapi-egl] vaAcquireSurfaceHandle() failed (invalid VASurfaceID)
Using hardware decoding (vaapi).
VO: [gpu] 1280x720 vaapi[nv12]
AO: [pulse] 44100Hz stereo 2ch float
(Paused) AV: 00:12:43 / 00:59:58 (21%) A-V: 0.000