n decoding order and have temporal_ id equal to tId. NOTE 2 - The set of access units consisting of the current access unit and all access units with temporal_id less than or equal to tId that follow the current access unit in decoding order can be decoded when all of the following access units, which precede the current access unit in decoding order, have been decoded: all access units required for decoding the required access unit (i.e., all access units that are directly or indirectly referenced through inter prediction in the decoding process for the required access unit), the required access unit, and all access units with temporal_id less than tId that succeed the required access unit and precede the current access unit in decoding order. Video usability information The specifications in Annex E apply with substituting SVC sequence parameter set for sequence parameter set. The VUI parameters and the constraints specified in Annex E apply to coded video sequences for which the SVC sequence parameter set becomes the active SVC sequence parameter set. Additionally, the following applies. G.14.1 SVC VUI parameters extension syntax SVC_vui_parameters_extension() { Descriptor vui_ext_num_entries_minus ue(v) for(i=0;i<=vui_ext_num_entries_minus1;i++){ vui_ext_dependency_id[i] vui_ext_quality_id[i] vui_ext_temporal_id[i] vui_ext_timing_info_present_flag[i if( vui_ext_timing_info_present_flag[i]) vui_ext_num_units_in_tick[i) u(32) vui_ext_time_scale[i] u(32) ui_ext_fixed_frame_rate_flag[i vui_ext_nal_hrd_parameters_present_flag[i] if( vui_ext_nal_hrd_parameters_present_flag[i) hrd_parameters() vui_ext_vcl_hrd_parameters_present_flag[i if( vui_ext_vcl_hrd_parameters_present_flag[ hrd_parameters() vui_ext_nal_hrd_parameters_present_flag[i]ll vel hrd parameters_p flag[ i]) yui_ext_low_delay_hrd_flag[i] vui_ext_pic_struct_present_flag| G.14.2 SVC VUI parameters extension semantics The SVC VUI parameters extension specifies timing information, HRD parameter sets, and the presence of picture structure information for subs