Best way to get h264 accelerated again?

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Install the official proprietary driver AMDGPU-PRO from AUR

  1. Install amf-amdgpu-pro 
$ pamac build amf-amdgpu-pro
  1. Edit /etc/environment/ to add a line:
VK_ICD_FILENAMES=/usr/share/vulkan/icd.d/amd_pro_icd64.json

  1. Reboot

  2. Check ffmpeg to decode and encode any video without loss of quality.

$ ffmpeg -i {INPUT}.mp4 -vcodec hevc_amf -rc 0 {OUTPUT}.mkv

I noticed that AMD AMF HEVC/H265 codec is faster than VAAPI (mesa).

Download test-video size: 75,5 MB, its video codec is AVC/H264.

AMD AMF HEVC/H265 encoding result:

Size: 52,5 MB
Speed: 4 sec
Quality: Good

VAAP (mesa) HEVC/H265 encoding result:

Size: 60,7 MB
Speed: 5 sec
Quality: Good

Edit:

This last command is only for utilizing the AMF encoder using ffmpeg.

I read a bit that ffmpeg refused to support AMF video decoder.

My guide is not a solution for watching video streams with AMF video decoder.

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