performing a conversion between a video and a bitstream of the video according to a rule, wherein the bitstream comprises one or more video pictures referring to one or more parameter sets,

wherein at least one of the one or more parameter sets includes a general syntax structure comprising timing and hypothetical reference decoder (HRD) parameters,

wherein the rule specifies that a first syntax flag is not included in the general syntax structure in response to (1) a second syntax flag specifying that network abstraction layer (NAL) HRD parameters are not present in the general syntax structure, and (2) a third syntax flag specifying that video coding layer (VCL) HRD parameters are not present in the general syntax structure, wherein the first syntax flag specifies that same picture-level timing information applies to all output layer sets in the bitstream,

wherein the first syntax flag is represented as general_same_pic_timing_in_all_ols_flag, and

wherein general_same_pic_timing_in_all_ols_flag being equal to 1 specifies that a constraint of same picture-level timing information applies to all output layer sets in the bitstream is enforced, and general_same_pic_timing_in_all_ols_flag being equal to 0 specifies that the constraint of same picture-level timing information applies to all output layer sets in the bitstream is not enforced.