From ISO/IEC 13818-1:2000/Amd.3:2004 (E) (Amendment 3: Transport of AVC video data over ITU-T Rec. H.222.0 | ISO/IEC 13818-1streams) paragraph 2.14.1:
Quote:
Each AVC access unit shall contain an access unit delimiter NAL Unit;
NOTE 2 – ITU-T Rec. H.264 | ISO/IEC 14496-10 requires that an access unit delimiter NAL Unit, if present, is the
first NAL Unit within an AVC access unit. Access unit delimiter NAL Units simplify the ability to detect the
boundary between pictures; they avoid the need to process the content of slice headers, and they are particularly useful for the Baseline and Extended profiles where slice order can be arbitrary.
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