CPC H04N 19/70 (2014.11) [H04N 19/172 (2014.11); H04N 19/174 (2014.11); H04N 19/184 (2014.11); H04N 19/188 (2014.11); H04N 19/46 (2014.11)] | 16 Claims |
1. A method of video processing, comprising:
performing a conversion between a video and a bitstream of the video,
wherein the bitstream conforms to a format rule,
wherein the format rule specifies that signaling a length of identifiers of subpictures in a sequence parameter set (SPS) of the bitstream is based on a value of a first syntax element in the SPS indicative of subpicture information is present, and independent of a value of a second syntax element in the SPS indicative of whether the identifiers are explicitly signaled, and
wherein the length corresponds to a number of bits used to represent a third syntax element indicating a subpicture identifier in the SPS, a fourth syntax element indicating a subpicture identifier in a picture parameter set (PPS) if present, and a fifth syntax element indicating a subpicture identifier in a slice header if present.
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