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Quoting SMPTE RDD 36:2015: A decoder shall abort if it encounters a bitstream with an unsupported bitstream_version value. If 0, the value of the chroma_format syntax element shall be 2 (4:2:2 sampling) and the value of the alpha_channel_type element shall be 0 (no encoded alpha); if 1, any permissible value may be used for those syntax elements. So if we're not in 4:2:2 or if there is alpha, we are not allowed to use version 0.