https://bugs.freedesktop.org/show_bug.cgi?id=105277
--- Comment #7 from Luke McKee hojuruku@gmail.com --- Final note before I wash my hands of this matter and leave it to the devs to fix.
I also just tried this with the new main / high profile options and cabac enabled that is now available in the more bleeding edge amd kernels / mesa / libva / ffmpeg.
The breakage on the hardware player and gstermer qtdemux still applies.
new h265 vaapi support is dangerous too. https://bugs.freedesktop.org/show_bug.cgi?id=103953#c7