According to Arch Wiki https://wiki.archlinux.org/title/Hardware_video_acceleration
you need MPEG-4 Part 2 is disabled by default due to VAAPI limitations. Set the environment variable <https://wiki.archlinux.org/title/Environment_variable> VAAPI_MPEG4_ENABLED=true to try to use it anyway. I tried with cingg/ffmpeg7 and it seemed to work, but ffmpeg7 had all our patches including patch8
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