I’m running a Chromebox which runs Ubuntu 20.04 (Celeron 3205U, Intel Broadwell-U Graphics, 4GB RAM, with the intel-media-driver driver installed. I’ve been trying to get hardware decode working, but Firefox and Chromium refuse to use it, even after changing the parameters in their configurations, and I’ve tried checking with mpv and vlc if VA-API Hardware decode works, but both of them seem to segfault when I open a normal MP4 video and specify using VA-API to decode. I notice in http that the memory usage spikes and that in dmesg there is an OOM event, however, I cannot find the root of the issue. I have also tried the i965 driver, the intel-media-driver-non-free, and others, but cannot solve the problem.
vainfo shows that VAAPI is enabled, but intel_gpu_top shows 0% usage of the Video unit. The hardware decode seems to work on the Chrome OS side of things, so I know it is not a hardware issue.
sudo apt-get install vainfoand then addvainfooutput to the question by editing it.