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by shmerl
913 days ago
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At least with AMD GPU, an easy way to do it is to check usage of VCN. Something like this (assuming your GPU index is 0): watch -n 1 sudo cat /sys/kernel/debug/dri/0/amdgpu_pm_info
You should see there: VCN: Enabled
If GPU accelerated video is being played.I think you might need to set this flag to true in Firefox's about:config (or it might be not needed anymore): media.ffmpeg.vaapi.enabled
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