Commits on Sep 9, 2021

1. Set chroma_sample_position only for YUV 4:2:0 …

   The chroma_sample_position syntax element is only used for YUV 4:2:0 in
   the AV1 bitstream. So set chroma_sample_position to
   ChromaSamplePosition::Unknown for all other YUV formats, including
   monochrome (YUV 4:0:0).
   
   Note: For still images, the most common chroma sample position in
   practice is the "center" position. Unfortunately the AV1 specification
   does not have a value for the "center" chroma sample position. See
   AOMediaCodec/av1-avif#88 and
   AOMediaCodec/av1-spec#308. This pull request
   preserves the ChromaSamplePosition::Colocated value that is currently
   used, but it is likely to be incorrect when YUV 4:2:0 is supported.

   

   wantehchang committed Sep 9, 2021
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