(In reply to Alex Deucher from comment #18)
> 
> H.264 works fine.  Not sure what's happening with your system.

It turns out I was running the old version of mpv and not the new one which was
advised build from the master branch.

Now I see that acceleration work from verbose output.
But now I able reproduce issue
https://bugs.freedesktop.org/show_bug.cgi?id=106430 also in mpv player which
first I met in Totem player when install gstreamer1-vaapi package for first
time.