The File Chunk represents the entire SMAF file. Within the chunk sequence a two-byte cyclic redundancy check (CRC) is appended to the body of the File Chunk.
The chunk sequence invariably starts with the Contents Info Chunk, which is followed by one or more Track Chunks. The chunk sequence cannot include two chunks with the same ChunkID. The appended CRC is used for checking whether the File Chunk is damaged.

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Outline of SMAF Specification