to hrdVI and the value of vui_mv_temporal_id[i] equal to hrdTId. For the specification in this annex, num_units_in_tick, time_scale, fixed_frame_rate_flag, al_hrd_parameters_present_ flag, vcl_hrd_parameters_present_flag,1 low_delay_hrd_flag, and pic_struct_present_flag are substituted with the values of fvui_mvc_num_units_in_tick[i], vui_mvc_time_scale[i vui_mvc_fixed_frame_rate_flag[ _hrd_parameters_present_flag vui_mve_vcl_hrd_parameters_present, ] , vui_mvc_low_delay_hrd_flag[i],and vui_mvc_pic_struct present i , respectively, with i being the value for which vui_mvc_view_id[i] is equal to hrdVId[j] for all j in the range of 0 to vui_mvc_num_traget_output_views_minus1[i],inclusive, and vui_mvc_temporal_id] i ] equal to hrdTId. The HRD is used to check conformance of bitstreams and decoders as specified in clauses C.3 and C.4, respectively. NOTE 7 - While conformance is guaranteed under the assumption that all frame-rates and clocks used to generate the bitstream match exactly the values signalled in the bitstream, in a real system each of these may vary from the signalled or specified value. All the arithmetic in this annex is done with real values, SO that no rounding errors can propagate. For example, the number of bits in a CPB just prior to or after removal of an access unit is not necessarily an integer. The variable to is derived as follows and is called a clock tick: tc = num_units_in_tick+ time_scale (C-1) The following is specified for expressing the constraints in this annex: Let access unit n be the n-th access unit in decoding order with the first access unit being access unit 0. Let picture n be the primary coded picture or the decoded primary picture of access unit n. Operation of coded picture buffer (CPB) The specifications in this clause apply independently to each set of CPB parameters that is present and to both the Type I and Type II conformance points shown in Figure C-1. C.1.1 Timing of bitstream arrival The HRD may be initialised at any one of the buffering period SEI messages. Prior to