 in clause 8.2.1). The value of pic_order_cnt_type shall be in the range of 0 to 2, inclusive. pic_order_cnt_type shall not be equal to 2 in a coded video sequence that contains any of the following: an access unit containing a non-reference frame followed immediately by an access unit containing a non-reference picture, two access units each containing a field with the two fields together forming a complementary non-reference field pair followed immediately by an access unit containing a non-reference picture, an access unit containing a non-reference field followed immediately by an access unit containing another non- reference picture that does not form a complementary non-reference field pair with the first of the two access units. log2_max_pic_order_cnt_lsb_minus4 specifies the value of the variable MaxPicOrderCntLsb that is used in the decoding process for picture order count as specified in clause 8.2.1 as follows: MaxPicOrderCntLsb = 2(log2_max_pic_order_cnt_lsb_minus4+4 (7-10) The value of og2_max_pic_order_cnt_lsb_minus4shall be in the range of 0 to 12, inclusive. lelta_pic_order_always_zero_flag equal to 1 specifies that delta_pic_order_cnt[ 0] and delta_pic_order_cnt[ are not present in the slice headers of the sequence and shall be inferred to be equal to 0. delta_pic_order_always_zero_flag equal to 0 specifies that delta_pic_order_cnt[ 0] is present in the slice headers of the sequence and delta_pic_order_cnt[ may be present in the slice headers of the sequence. Rec. ITU-T H.264 (01/2012) offset_for_non_ref_pic is used to calculate the picture order count of a non-reference picture as specified clause 8.2.1. The value of offset_for_non_ref_pic shall be in the range of -231 + 1 to 231 - 1, inclusive. offset_for_top_to_bottom_field is used to calculate the picture order count of a bottom field as specified in clause 8.2.1. The value of offset_for_top_to_bottom_field shall be in the range of -231 + 1 to 231 - 1, inclusive. aum_ref_frames_in_pic_order_cnt_cycleis used in the decoding process for picture