 231 - 1, inclusive. When this syntax element is not present in the bitstream for the current slice, it shall be inferred to be equal to 0. redundant_pic_c shall be equal to 0 for slices and slice data partitions belonging to the primary coded picture. The value of redundant_pic_cnt shall be greater than 0 for coded slices or coded slice data partitions of a redundant coded picture. When redundant_pic_cnt is not present in the bitstream, its value shall be inferred to be equal to 0. The value of redundant_pic_cnt shall be in the range of 0 to 127, inclusive. NOTE 6 - Any area of the decoded primary picture and the corresponding area that would result from application of the decoding process specified in clause 8 for any redundant picture in the same access unit should be visually similar in appearance. The value of in a coded slice or coded slice data partition of a redundant coded picture shall be such that the value ofbottom_field_pic_order_in_frame_present_flagin the picture parameter set in use in a redundant coded picture is equal to the value ofbottom_field_pic_order_in_frame_present_flagin the picture parameter set in use in the corresponding primary coded picture. When present in the primary coded picture and any redundant coded picture, the following syntax elements shall have the same value: field_pic_flag, bottom_field_flag, and idr_pic_id. When the value of nal ref idc in one VCL NAL unit of an access unit is equal to 0, the value of ref idc in all other VCL NAL units of the same access unit shall be equal to 0. NOTE 7 - The above constraint also has the following implications. If the value of idc for the VCL NAL units of the primary coded picture is equal to 0, the value of nal ref idc for the VCL NAL units of any corresponding redundant coded picture are equal to 0; otherwise (the value of for the VCL NAL units of the primary coded picture is greater than 0), the value of nal for the VCL NAL units of any corresponding redundant coded picture are also greater than 0. The marking status of reference p