specified in Annex C of the Recommendation | International Standard. In the following, bTotal is the number of bits in all NAL units succeeding a sub-sequence layer characteristics SEI message (including the bits of the NAL units of the current access unit) and preceding the next access unit (in decoding order) including a sub-sequence layer characteristics SEI message (if present) or the end of the stream (otherwise). t1 is the removal time (in seconds) of the current access unit, and t2 is the removal time (in seconds) of the latest access unit (in decoding order) before the next sub-sequence layer characteristics SEI message (if present) or the end of the stream (otherwise). When accurate_statistics_flag is equal to 1, the following conditions shall be fulfilled as follows: If t1 is not equal to t2, the following condition shall be true: average_bit_rate = = ( * 1000) (D-6) Otherwise (t1 is equal to t2), the following condition shall be true: average_bit_rate = = 0 (D-7) average_frame_rate indicates the average frame rate in units of frames/(256 seconds). All NAL units in the range of sub-sequence layers specified above are taken into account in the calculation. In the following, fTotal is the number of frames, complementary field pairs and non-paired fields between the current picture (inclusive) and the next sub-sequence layer characteristics SEI message (if present) or the end of the stream (otherwise). t1 is the removal time (in seconds) of the current access unit, and t2 is the removal time (in seconds) of the latest access unit (in decoding order) before the next sub-sequence layer characteristics SEI message (if present) or the end of the stream (otherwise). Rec. ITU-T H.264 (01/2012) When accurate_statistics_flag is equal to 1, the following conditions shall be fulfilled as follows: If t1 is not equal to t2, the following condition shall be true: average_frame_rate == Round(fTotal*256(t2-t1)) (D-8) Otherwise (t1 is equal to t2), the following condition shall be true: average_frame_rate ==0 (D-9) D.2.13