ts the parts of the corresponding primary coded pictures that correspond to the NAL units having the same colour_plane_id. This SEI message indicates that, for each picture in the target picture set, the inter prediction process is constrained as follows: No sample value outside the slice group set, and no sample value at a fractional sample position that is derived using one or more sample values outside the slice group set is used for inter prediction of any sample within the slice group set. num_slice_groups_in_set_minus1 + 1 specifies the number of slice groups in the slice group set. The allowed range of num_slice_groups_in_set_minus1 is 0 to num_slice_groups_minus1, inclusive. The allowed range of num_slice_groups_minus1 is specified in Annex A and clauses G.10 and H.10. slice_group_id[ with i=0.. num_slice_groups_in_set_minus1 identifies the slice group(s) contained within the slice group set. The allowed range for slice_group_id[ is from 0 to num_slice_groups_minus1, inclusive. The length of the slice_group_id[ syntax element isCeil(Log2(num_slice_groups_minus1+1))bits. When num_slice_groups_minusl is equal to 0 (i.e., num_slice_groups_in_set_minus1 is equal to 0 and slice_group_id[ 0 is not present), the value of slice_group_id[0 shall be inferred to be equal to exact_sample_value_match_flag equal to 0 indicates that, within the target picture set, when the macroblocks that do not belong to the slice group set are not decoded, the value of each sample in the slice group set need not be exactly the same as the value of the same sample when all the macroblocks are decoded. exact_sample_value_match_flag equal to 1 indicates that, within the target picture set, when the macroblocks that do not belong to the slice group set are not decoded, the value of each sample in the slice group set shall be exactly the same as the value of the same sample when all the macroblocks in the target picture set are decoded. NOTE 2 - When disable_deblocking_filt is equal to 1 or 2 in all slices in the target picture set, exact