Patent ID: 11909967
Assignee: BYTEDANCE INC.
Field: nan (nan)
Classification: CPC nan | IPC H

Claim 0:
1. A method of video processing, comprising:
determining, for a conversion between a chroma block of a current processing unit of a current subpicture of a current picture of a video and a bitstream of the video, that a cross component adaptive loop filtering operation is applied to the chroma block, wherein the current picture comprises one or more subpictures; and
performing the conversion based on the determining,
wherein in the cross component adaptive loop filtering operation, a chroma sample of the chroma block is filtered based on information of luma samples,
wherein one or more luma samples located outside the current processing unit are excluded from the filtering of the chroma sample,
wherein the bitstream conforms to a format rule which specifies that different subpictures have different subpicture ID values, wherein when a value of one or more syntax elements is equal to 0 indicating that subpicture ID mapping is not explicitly signalled in a sequence parameter set or in a picture parameter set, a default value is assigned to the subpicture ID value of the subpicture.