roblock address for the first macroblock of each coded slice NAL unit of the same slice group. NAL units having nal unit type equal to 12 may be present in the access unit but shall not precede the first VCL NAL unit of the primary coded picture within the access unit. NAL units having nal_unit_type equal to 0 or in the range of 24 to 31, inclusive, which are unspecified, may be present in the access unit but shall not precede the first VCL NAL unit of the primary coded picture within the access unit. NAL units having nal_unit_type in the range of 21 to 23, inclusive, which are reserved, shall not precede the first VCL NAL unit of the primary coded picture within the access unit (when specified in the future by ITU-T ISO/IEC). H.7.4.2 Raw byte sequence payloads and RBSP trailing bits semantics H.7.4.2.1 Sequence parameter set RBSP semantics The semantics specified in clause 7.4.2.1 apply. H.7.4.2.1.1 Sequence parameter set data semantics For all syntax elements other than max_num_ref_frames, the semantics specified in clause 7.4.2.1.1 apply with the substitution of MVC sequence parameter set for sequence parameter set. All constraints specified in clause 7.4.2.1.1 apply only to the view components for which the MVC sequence parameter set is the active MVC sequence parameter set or the active view MVC sequence parameter set as specified in clause H.7.4.1.2.1. For each coded video sequence, the active MVC sequence parameter set and all active view MVC sequence parameter sets (if any) shall have the same values of pic_width_in_mbs_minus1, pic_height_in_map_units_minus1, and frame_mbs_only_flag When the seq_parameter_set_data() syntax structure is present in a subset sequence parameter set RBSP and vui_parameters_present_flag is equal to 1, timing_info_present_flag shall be equal to nal_hrd_parameters_present_flag shall be equal to 0, vcl_hrd_parameters_present_flag shall be equal to 0, and bic_struct_present_flag shall be equal to 0. The value of 1 for timing_info_present_flag, nal_hrd_parameters_present_flag, vcl_h