US Patent 11968405 Signalling of high level syntax indication

A method of video processing includes performing a conversion between a video including a picture and a bitstream of the video, wherein the bitstream conforms to a format rule, wherein the format rule specifies that an indication of whether a first flag is signalled at a beginning of a picture header associated with the picture, wherein the first flag is indicative of whether the picture is an intra random access point (IRAP) picture or a gradual decoding refresh (GDR) picture.