H.7.4.1.1 NAL unit header MVC extension semantics The syntax elements non_idr_flag, priority_id, view_id, temporal_id, anchor_pic_flag, and inter_view_flag, when present in a prefix NAL unit, are considered to apply to the associated NAL unit. non_idr_flag equal to 0 specifies that the current access unit is an IDR access unit. The value of non_idr_flag shall be the same for all VCL NAL units of an access unit. When non_idr_flag is equal to 0 for a prefix NAL unit, the associated NAL unit shall have nal_unit_type equal to 5. When non_idr_flag is equal to 1 for a prefix NAL unit, the associated NAL unit shall have nal_unit_type equal to 1. When nal_unit_type is equal to 1 and the NAL unit is not immediately preceded by a NAL unit with nal_unit_type equal to 14, non_idr_flag shall be inferred to be equal to 1. When nal unit type is equal to 5 and the NAL unit is not immediately preceded by a NAL unit with nal_unit_type equal to 14, non_idr_flag shall be inferred to be equal to 0. When nal_ref idc is equal to 0, the value of non_idr_flag shall be equal to 1. For NAL units in which non_idr_flag is present, the variable IdrPicFlag derived in clause 7.4.1 is modified by setting it equal to 1 when non_idr_flag is equal to 0, and setting it equal to 0 when non_idr_flag is equal to 1. priority_id specifies a priority identifier for the NAL unit. A lower value of priority_id specifies a higher priority. The assignment of values to priority_id is constrained by the sub-bitstream extraction process as specified in clause H.8.5.3. When unit type is equal to 1 or 5 and the NAL unit is not immediately preceded by a NAL unit with nal_unit_type equal to 14, priority_id shall be inferred to be equal to 0. NOTE 1 - The syntax element priority id is not used by the decoding process specified in this Recommendation | International Standard. The syntax element priority_ id may be used as determined by the application within the specified constraints. view id specifies a view identifier for the NAL unit. NAL units with the same value o