On Tue, 11 Feb 2025, Krzysztof Pyrkosz via ffmpeg-devel wrote:

Splitting the previous patch into two.
I noticed that on my x86 box, one of the newly added tests fail:

MMXEXT:
  uyvytoyuv420_mmxext (sw_rgb.c:126)
  yuyvtoyuv420_mmxext (sw_rgb.c:126)
- sw_rgb.uyvytoyuv          [FAILED]

SSE2, AVX and AVX2 are passing, though.

I checked this, and the reason that this is failing, is that the chroma values are off by one, for a lot of the output pixels here.

Kinda surprising for something that should only reshuffle pixels and not touch their values...

// Martin

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