 coded video sequence and fixed_frame_rate_flag is equal to 1 in the coded video sequence containing picture nn and the value of num_units_in_tick time_scale is the same for both coded video sequences. Table E-6 - Divisor for computation of pic_struct_present_flag field_pic_flag pic_struct DeltaTfiDivisor NOTE 7 - In order to produce a DeltaTfiDivisor other than 2 for a picture with field_pic_flag equal to 0, pic_struct_present_flag must be equal to 1. nal_hrd_parameters_present_flag equal to 1 specifies that NAL HRD parameters (pertaining to Type II bitstream conformance) are present. hal_hrd_parameters_present_flag equal to 0 specifies that NAL HRD parameters are not present. NOTE 8 - When nal_hrd_parameters_present_flag is equal to 0, the conformance of the bitstream cannot be verified without provision of the NAL HRD parameters and all buffering period and picture timing SEI messages, by some means not specified in this Recommendation | International Standard. When nal_hrd_parameters_present_flag is equal to 1, NAL HRD parameters (clauses E.1.2 and E.2.2) immediately follow the flag. The variable NalHrdBpPresentFlag is derived as follows: If any of the following is true, the value of NalHrdBpPresentFlag shall be set equal to 1: hal_hrd_parameters_present_flagis present in the bitstream and is equal to 1, the need for presence of buffering periods for NAL HRD operation to be present in the bitstream in buffering period SEI messages is determined by the application, by some means not specified in this Recommendation International Standard. Otherwise, the value of NalHrdBpPresentFlag shall be set equal to 0. cl_hrd_parameters_present_flag equal to 1 specifies that VCL HRD parameters (pertaining to all bitstream conformance) are present. vcl_hrd_parameters_present_flag equal to 0 specifies that VCL HRD parameters are not present. NOTE 9 - When cl_hrd_parameters_present_flag is equal to 0, the conformance of the bitstream cannot be verified without provision of the VCL HRD parameters and all buffering period and p