cture) of the access unit would be decoded. There is no required decoding process for a coded slice or coded slice data partition of a redundant coded picture. When the redundant in the slice header of a coded slice is greater than 0, the decoder may discard the coded slice. However, a coded slice or coded slice data partition of any redundant coded picture shall obey the same constraints as a coded slice or coded slice data partition of a primary picture. NOTE 9 - When some of the samples in the decoded primary picture cannot be correctly decoded due to errors or losses in transmission of the sequence and one or more coded slices of a redundant coded picture can be correctly decoded, the decoder should replace the samples of the decoded primary picture with the corresponding samples of the decoded slice or decoded slices Rec. ITU-T H.264 (01/2012) of the redundant coded picture. When slices of more than one redundant coded picture cover the relevant region of the primary coded picture, the slice or slices of the redundant coded picture having the lowest value of Tredundant_pic_cnt should be used. Slices and slice data partitions having the same value of redundant_pic_cnt belong to the same coded picture. If the value of redundant is equal to 0, they belong to the primary coded picture; otherwise (the value of redundant pi is greater than 0), they belong to the same redundant coded picture. Decoded slices within the same redundant coded picture need not cover the entire picture area and shall not overlap. direct_spatial_mv_pred_flag specifies the method used in the decoding process to derive motion vectors and reference indices for inter prediction as follows: If direct_spatial_mv_pred_flag is equal to 1, the derivation process for luma motion vectors for B_Skip, Direct_16x16, and B_Direct_8x8 in clause 8.4.1.2 shall use spatial direct mode prediction as specified clause 8.4.1.2.2. Otherwise (direct_spatial_mv_pred_flag is equal to 0), the derivation process for luma motion vectors for B Skip, B_Direct_16x16, and