[Cin] Tested vaapi hwaccel presets

[Phyllis Smith]

I will add a similar note as Andrea has suggested.

You are right; my graphics card (VCN 2.0) is not capable of AV1
> hardware encoding at 8-10bit.
> I propose to add a note to the presets similar to:
>
> # The GPU must be capable of 8-10bit hardware encoding.
>
>
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