en an application keeps an operation point not present SEI message in a sub-bitstream extracted according to the process specified in clause H.8.5.3, the application may need to change the content of the operation point not present SEI message according to the semantics. num_operation points specifies the number of operation points that are indicated not to be present by the SEI message. um_operation points equal to 0 indicates that all operation points indicated by the view scalability information SEI message are present. The value of num_operation points shall be in the range of 0 to the value of num_operation_points_minus1 in the previous view scalability information SEI message in decoding order, inclusive. operation_point_not_present_id[k| identifies an operation point that is not present. operation_point_not_present_id[k] shall be equal to the value of one of the operation point id| syntax elements of the previous view scalability information SEI message in decoding order. The value of operation_point_not_present_id[k shall be in the range of 0 to 65535, inclusive. H.13.2.9 Base view temporal HRD SEI message semantics When present, this SEI message shall be associated with an IDR access unit. The SEI message applies to the coded video sequence. Some temporal subsets identified by sei_mvc_temporal_id[i may not be present in the coded video sequence. am_of_temporal_layers_in_base_view_minus1 plus 1 specifies the number of temporal bitstream subsets in the coded video sequence for which the following syntax elements apply. The value of _of_temporal_layers_in_base_view_minus1 shall be in the range of 0 to 7, inclusive. sei_mvc_temporal_id|i specifies the temporal_i id value of the i-th temporal bitstream subset. Let the i-th bitstream subset for the coded video sequence that is obtained by invoking the sub-bitstream extraction process as specified in clause H.8.5.3 with IdTarget equal to sei_mvc_temporal_id[i] as input. sei_mvc_timing_info_present_flag[i equal to 1 specifies that sei_mvc_num_units_in_tick[i], s