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An avcC High-profile extension or an hvcC record can carry a chroma format of 0 for a 4:2:0 stream, which labelled such files "YUV 4:0:0" in Media File Properties (two files of the 92 in #1959). The SPS is what the decoder decodes, so it is read first; the record's fields are only the fallback when no SPS can be parsed. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011K1peyrh5MdZ6ttHkVq8Gh