Le vendredi 08 mai 2020 à 15:16 +0200, Hans Verkuil a écrit : > > I think this comes directly from the spec. The Rockchip VDEC doesn't > > seem to use it. > > Do you think we can drop it from here, and rely on the V4L2 colorspace > > passed in the format negotiation? > > > That would be preferred, yes. Otherwise you would have two places where you can > define colorspaces, and that's confusing. This is indeed redundant with the color information in the format. In VP8/9 there is only 1 header for everything, so it's harder to figure- out what to filter. While in H.264/HEVC this information is usually set an an extension header. Though this do re-open the discussion about SPS in H.264/HEVC. In there you will find the coded size and the crop window and the sub-sampling. I don't remember exactly what was the conclusion, but I think it was kept to allow allow bitstream reconstruction. But it will effectively overlap directly (or indirectly) with some V4L2 generic API. regards, Nicolas
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