y the values of the syntax elements top left[ and bottom_right[i] top_left[ i ] shall be less than or equal to bottom_right[i] and bottom_right[i] shall be less than PicSizeInMapUnits. (top_left[i]% PicWidthInMbs ) shall be less than or equal to the value of bottom_right[i]%! "icWidthInMbs ). slice_group_change_direction_flag is used with slice_group_map_type to specify the refined map type when ce_group_map_type is 3, 4, or 5. slice_group_change_rate_minus1 is used to specify the variable SliceGroupChangeRate SliceGroupChangeRate specifies the multiple in number of slice group map units by which the size of a slice group can change from one picture to the next. The value of slice_group_change_rate_minus1 shall be in the range of 0 to PicSizeInMapUnits - 1, inclusive. The SliceGroupChangeRate variable is specified as follows: SliceGroupChangeRate= slice_group_change_rate_minus1 = + 1 (7-22) pic_size_in_map_units_minus1 is used to specify the number of slice group map units in the picture. pic_size_in_map_units_minus1 shall be equal to PicSizeInMapUnits - 1. Rec. ITU-T H.264 (01/2012) slice_group_id[i identifies a slice group of the i-th slice group map unit in raster scan order. The length of the slice group id| syntax element is Ceil( Log2( + 1)) bits. The value of slice_group_id[i] shall be in the range of 0 to num_slice_groups_minus1, inclusive. num_ref_idx_10_default_active_minusls specifies how num ref idx 10active minusli is inferred for P, SP, and B slices with num_ref_idx_active_override_flag equal to 0. The value ofnum_ref_idx_10_default_active_minus1 shall be in the range of 0 to 31, inclusive. sum_ref_idx_l1_default_active_minus1 specifies how aum_ref_idx_l1_active_minus1 is inferred for B slices with num_ref_idx_active_override_flagequal to 0. The value of be in the range of 31, inclusive. weighted_pre equal to 0 specifies that the default weighted prediction shall be applied to P and SP slices. weighted_pred_flag equal to 1 specifies that explicit weighted prediction shall be applied to P and SP slic