[Cin] Mesa3d va-api encoding MR

[Andrew Randrianasulu]

new MR concerning vaapi encoding in qemu-based virtual machines (required
virglrenderer patch)

https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18831

чт, 11 авг. 2022 г., 08:08 Andrew Randrianasulu <randrianasulu at gmail.com>:

> So, few hours ago this merge request for mesa3d surfaced (I think it
> affects radeonsi AMD cards)
>
> ---
> why: to enhance va video encoding quality
> how: use va encoding quality_level interface, and provide
> default value and encoding quality adjustment options,
> so that users can finetune encoding quality and performance
> from va quality interface.
>
>  There are 3 settings added:
>  -- preset modes: speed, balance, quality
>     they are using different encoding strategies
>  -- vbaq modes: vbaq mode is using variance based strategy
>     to improve the subjective image quality
>  -- pre-encoding modes:
>     Using scaled down input image for pre-encoding to have
>     better rate-control reaction and consume more memory
>     in the same time. Only preencoding-4x mode is enabled.
> ---
>
> https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17994
>
>
>
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