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A comment on Vulkan video extensions for accelerated H.264 and H.265 encode. Parent comment

Re:Vulkan video extensions for accelerated H.264 and H.265 e... by shmerl on Tuesday December 19, 2023 @08:15PM (#38704331)
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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