Patent ID: 11956454
Assignee: BYTEDANCE INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. An apparatus for processing video data, comprising:
a processor; and
a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:
perform a conversion between a video and a bitstream of the video,
wherein the bitstream comprises one or more pictures comprising one or more subpictures according to a rule,
wherein the rule specifies that, responsive to a condition that no subpicture identifier mapping is indicated in the bitstream and a subpicture sub-bitstream extraction process extracts a subpicture sequence that is identified by a subpicture index greater than zero, a rewriting operation is performed on referenced one or more sequence parameter sets during the subpicture sub-bitstream extraction process by which a target output sub-bitstream is extracted from the bitstream, and
wherein the rewriting operation comprises including a subpicture identifier mapping into the referenced one or more sequence parameter sets.