NalFactor are specified in clause A.3.3 (for profiles specified in Annex A) or clause G.10.2.2 (for profiles specified in Annex G) or clause H.10.2 (for profiles specified Annex H). cbr_flag| SchedSelIdx ] equal to 0 specifies that to decode this bitstream by the HRD using the SchedSelIdx-th CPB specification, the hypothetical stream delivery scheduler (HSS) operates in an intermittent bit rate mode. cbr_flag[ SchedSelIdx ] equal to 1 specifies that the HSS operates in a constant bit rate (CBR) mode. When the cbr_flag[ SchedSelIdx ] syntax element is not present, the value of cbr_flag shall be inferred to be equal to 0. hitial_cpb_removal_delay_length_minus1 specifies the length in bits of the initial_cpb_removal_delay[ SchedSelIdx ] and initial_cpb_removal_delay_offset[SchedSelIdx ] syntax elements of the buffering period SEI message. The length of nitial_cpb_removal_delay[SchedSelldx and of initial_cpb_removal_delay_offset[S SchedSelIdx ] initial_cpb_removal_delay_length_minus1+ When the nitial_cpb_removal_delay_length_minus] syntax element is present in more than one hrd parameters() syntax structure within the VUI parameters syntax structure, the value of the initial_cpb_removal_delay_length_minus] parameters shall be equal in both hrd parameters() syntax structures. When the initial_cpb_removal_delay_length_minus1 syntax element is not present, it shall be inferred to be equal to 23. cpb_removal_delay_length_minus1 specifies the length in bits of the cpb_removal_delay syntax element. The length of cpb_removal_delay syntax element of the picture timing SEI message is pb_removal_delay_length_minus + 1. When the cpb_removal_delay_length_minus1 syntax element is present in more than one hrd parameters() syntax structure within the VUI parameters syntax structure, the value of the cpb_removal_delay_length_minus1 parameters Rec. ITU-T H.264 (01/2012) shall be equal in both hrd __parameters() syntax structures. When the cpb_removal_delay_length_minus1 syntax element is not present, it shall be inferred to be equal 