[Bug 104920] Broken hardware video encoding with vaapi/ffmpeg

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104920

--- Comment #6 from Andy Furniss <adf.lists at gmail.com> ---
(In reply to Luke McKee from comment #3)

> ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128
> -hwaccel_output_format vaapi -ss 120 -t 120 -i a-movie.mkv -map 0:0 -map 0:1
> -c:v h264_vaapi -b:v 4000k -qp 20 -bf 0 -profile:v 578 (or
> constrained_baseline in ffmpeg-git) -movflags +faststart -quality:v 0
> -level:v 3.1 -coder:v cavlc -c:a aac -ab 128k -ar 48000 -ac 2 vaapitest.mp4

Not related to any issue as such - and I don't have the same h/w to test, but
some thoughts related to the command line.

-b:v 4000k -qp 20

I would think one or the other, not both ie. you want constant bitrate or you
want constant qp (= highly variable bitrate). I didn't test what ffmpeg takes
this to mean.

-coder:v cavlc

I don't think this is hooked up - you will probably get cabac or calvlc
depending on h/w.

-quality:v 0

I don't thing this will do anything either on VCE (I don't know anything about
the newer engines)

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