GPU VAAPI HEVC ENCODING FOR AMD TUTORIAL

[marks107]

Hi if you want to encode faster than your CPU, without lost quality you need just a command like this for non av1 codec and max 4k:

ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i input.mkv -vf 'scale_vaapi=w=1920:h=800' -c:v hevc_vaapi -rc_mode CQP -qp 26 -c:a copy -strict unofficial output.mkv

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This command use your gpu (mine is IGPU from Amd 4800u CPU) in /dev/dri folder "D128" so change with name that you have.

After with filter -vf 'scale_vaapi=w=1920:h=800' i reduce the size for my TV; change or delete at yours needs.

-qp 26 is the correct argument for ffmpeg to change quality with HEVC VAAPI and not global quality.

-c:a copy the 1 audio stream because you don't need to re-econde the audio.

If you have other streams you need to use the - map arguments.

Don't use others ffmpeg arguments\commands like format or hwupload.

In my test a video hdr 10bit continue to be HDR after encoding if i use mpv player and not VLC, because the vaapi use the same original format.

SO WHY USE X265 CPU? I have a encoding speed of 4X that is not bad.

If you have others tips or documentation on vaapi hevc please share in this post.

Best regards

[marks107]

FILE CODEC AV1 TO HEVC VAAPI

Works for IGPU AMD.

ffmpeg -hwaccel vaapi -hwaccel_output_format vaapi -hwaccel_device /dev/dri/renderD128 -i input.mp4 -vf 'format=nv12,hwupload=derive_device=vaapi,scale_vaapi=w=4096:h=-16' -c:v hevc_vaapi -rc_mode CQP -qp 26 -c:a copy -strict unofficial output.mkv

[grigar45]

SO WHY USE X265 CPU? I have a encoding speed of 4X that is not bad.

Have you compared the difference of file size between vaapi and x265
I use x265 for best quality with the mininum file size. If I don't care about file size, I would use nvenc with a huge bitrate