ension. ui_ext_timing_info_present_flag[ equal to 0 specifies that vui_ext_num_units_in_tick[i] vui_ext_time_scale[i], and vui_ext_fixed_frame_rate_flag[ for the i-th subset of coded video sequences are not present in the SVC VUI parameters extension. The following syntax elements for the i-th subset of coded video sequences are specified using references to Annex E. For these syntax elements the same semantics and constraints as the ones specified in Annex E apply, as if these syntax elements vui_ext_num_units_in_tick[i], vui_ext_time_scale[i], vui_ext_fixed_frame_rate_flag[i] ui_ext_nal_hrd_parameters_present_flag[i] vui_ext_vcl_hrd_parameters_present_flag[i], vui_ext_low_delay_hrd_flag[i], and vui_ext_pic_struct_present_flag[i] were present as the syntax elements um_units_in_tick, time_scale, fixed_frame_rate_flag, nal_hrd_parameters_present_flag, cl_hrd_parameters_present_flag,low_delay_hrd_flag, and pic_struct_present_flag, respectively, in the VUI parameters of the active SVC sequence parameter sets for the i-th subset of coded video sequences. vui_ext_num_units_in_tick[i]specifies the value of num_units_in_tick, as specified in clause E.2.1, for the i-th subset of coded video sequences. vui_ext_time_scale[ specifies the value of time_scale, as specified in clause E.2.1, for the i-th subset of coded video sequences. vui_ext_fixed_frame_rate_flag[i]s specifies the value of fixed_frame_rate_flag, as specified in clause E.2.1, for the i-th subset of coded video sequences. vui_ext_nal_hrd_parameters_present_flag[i]s specifies the value of nal_hrd_parameters_present_flag,as specified in clause E.2.1, for of coded video sequences. When vui_ext_nal_hrd_parameters_present_flag[ is equal to 1, NAL HRD parameters (clauses E.1.2 and E.2.2) for the i-th subset of coded video sequences immediately follow the flag. The variable VuiExtNalHrdBpPresentFlag[ i ] is derived as follows: If any of the following is true, the value of VuiExtNalHrdBpPresentFlag[ shall be set equal to 1: vui_ext_nal_hrd_parameters_present_flag[ is 