Files
UltraGrid/src
Martin Pulec 2f145378ef vcomp/lavc: prefer libvpx-vp9 for VP9
It doesn't seem that libsvt_vp9 is better even for AVX2+ processors.

From testing with i9-9820X and 9950X with `testcard2:noise:fps=200` we got
60 FPS for SVT and 72 for VPX in case of Intel and 153 and 128 for AMD.
In the SVT case, the frame was significatly (250 framees) delaysed with
default setting.

Also, while libsvt_vp9 supports just yuv420p, libvpx-vp9 offers up to
12 bit 4:4:4 subsampled both YUV and RGB pixel formats.

For the record, there has been a [patch](https://github.com/OpenVisualCloud/SVT-VP9/pull/67)
for libsvt_vp9 to support pre-AVX2, but it doesn't seem to make much sense
to use.
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