e picture lists to the reference picture lists to be used for decoding the slice. ref_pic_list_modification_flag_10equal to 1 specifies that the syntax element modification_of_pic_nums_idc is present for specifying reference picture list 0. ref_pic_list_modification_flag_10equal to 0 specifies that this syntax element is not present. When ref_pic_list_modification_flag_I0 is equal to 1, the number of times that modification_of_pic_nums_ido is not equal to 3following ref_pic_list_modification_flag_10 shall not exceed num_ref_idx_10_active_minus1+1 When RefPicList0[num_ref_idx_10_active_minus1 in the initial reference picture list produced as specified in clause 8.2.4.2 is equal to "no reference picture", ef_pic_list_modification_flag_10shall be equal to 1 and modification_of_pic_nums_idc shall not be equal to 3 until IRefPicList0[num_ref_idx_10_active_minusl] in the modified list produced as specified in clause 8.2.4.3 is not equal to "no reference picture". Rec. ITU-T H.264 (01/2012) ref_pic_list_modification_flag equal to 1 specifies that the syntax element modification_of_pic_nums_ide is present for specifying reference picture list 1. ref_pic_list_modification_flag_11 equal to 0 specifies that this syntax element is not present. When ref_pic_list_modification_flag_I1 is equal to 1, the number of times that tmodification_of_pic_nums_ide is not equal to 3 following ref_pic_list_modification_flag_l] shall not exceed dnum_ref_idx_l1_active_minus1+1 When decoding a slice with slice type equal to 1 or 6 and RefPicList1[num_ref_idx_l1_active_minus1 in the initial reference picture list produced as specified in clause 8.2.4.2 is equal to "no reference picture", ref pic_list_modification_flag_ll shall be equal to 1 and modification of shall not be equal to 3 until RefPicList1[num_ref_idx_l1_active_minus1 in the modified list produced as specified in clause 8.2.4.3 is not equal to "no reference picture". modification_of_pic_nums_idct together with abs_diff_pic_num_minus1 or long_term_pic_num specifies which of the refer