pe or display rate is used by the decoder, then pic_struct does not indicate the display method, but may aid in processing the decoded video for the alternative display. When it is desired for pic_struct to have an effective value in the range of 5 to 8, inclusive, pic_struct_present_flag should be equal to 1, as the above inference rule will not produce these values. Rec. ITU-T H.264 (01/2012) Table D-1 - Interpretation of pic_struct Value Indicated display of picture Restrictions NumClockTS (progressive) frame field_pic_flag shall be 0, TopFieldOrderCnt shall be equal to BottomFieldOrderCnt top field field_pic_flag shall be 1, bottom field flag shall be 0 bottom field field_pic_flag shall be 1, bottom field flag shall be top field, bottom field, in that order field pic flag shall be 0, TopFieldOrderCnt shall be less than or equal to BottomFieldOrderCnt bottom field, top field, in that order field_pic_flag shall be 0, BottomFieldOrderCnt shall be less than or equal to TopFieldOrderCnt top field, bottom field, top field repeated, field_pic_flag shall be 0, in that order TopFieldOrderCnt shall be less than or equal to BottomFieldOrderCnt bottom field, top field, bottom field field_pic_flag shall be 0, repeated, in that order BottomFieldOrderCnt shall be less than or equal to TopFieldOrderCnt frame doubling ield_pic_flag shall 0, fixed_frame_rate_flag shall be 1, TopFieldOrderCnt shall be equal to BottomFieldOrderCnt frame tripling field_pic_flag shall be 0, fixed_frame_rate_flag shall be 1, TopFieldOrderCnt shall be equal to BottomFieldOrderCnt 9..15 reserved When fixed_frame_rate_flag is equal to 1, it is a requirement of bitstream conformance that the constraints specified as follows shall be obeyed throughout the operation of the following process, which is operated in output order. 1. Prior to output of the first picture of the bitstream (in output order) and prior to the output of the first picture (in output order) of each subsequent coded video sequence for which the content of the active sequence parameter