US Patent 11871012 Signaling of subpicture level and buffering information

Examples of video encoding methods and apparatus and video decoding methods and apparatus are described. An example method of video processing includes performing a conversion between a video and a bitstream of the video, wherein the bitstream comprises one or more output layer sets comprising one or more video layers according to a rule, wherein the rule specifies a particular decoding order between a subpicture level information (SLI) supplemental enhancement information (SEI) message and a buffering period (BP) SEI message that apply to a particular output layer set, responsive to a condition that the SLI SEI message and the BP SEI message are included in an access unit.