| CPC H04N 19/70 (2014.11) [H04N 19/132 (2014.11); H04N 19/17 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/30 (2014.11); H04N 19/46 (2014.11)] | 20 Claims |
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1. A method of processing video data, comprising:
determining, based on a rule, whether one or more syntax elements applicable to a region of a video are included in one or more syntax structures of a bitstream of the video, wherein the one or more syntax elements are indicative of at least one quantization parameter offset to luma quantization parameter for deriving one or more quantization parameters of one or more chroma components of the region of the video; and
performing a conversion between the region of the video and the bitstream based on the determining,
wherein the rule is based on a chroma format of the region of the video, and wherein the rule indicates that the one or more syntax elements are absent in the bitstream in case the chroma format is 4:0:0,
wherein the method further comprises:
determining, based on the rule, whether one or more first syntax flags applicable to the region of the video are absent in a bitstream of the video, wherein the one or more first syntax flags are indicative of usage of a first coding step for the region, wherein the first coding step is a chroma scaling process applied to a chroma residue in which a scaling coefficient is derived based on reconstructed luma samples,
wherein the one or more first syntax flags are absent in the bitstream in case the chroma format is 4:0:0.
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