         |    |    |    |    |    |stz2|    |    | Compact Sample Size Box      |
            +----+----+----+----+----+----+----+----+------------------------------+
            |    |    |    |    |    |stco|    |    | Chunk Offset Box             |
            +----+----+----+----+----+ or +----+----+------------------------------+
            |    |    |    |    |    |co64|    |    | Chunk Large Offset Box       |
            +----+----+----+----+----+----+----+----+------------------------------+
     