---------+
            |    |mvhd|    |    |    |    |    |    | Movie Header Box             |
            +----+----+----+----+----+----+----+----+------------------------------+
            |    |trak|    |    |    |    |    |    | Track Box                    |
            +----+----+----+----+----+----+----+----+------------------------------+
            |    |    |tkhd|    |    |    |    |    | Track Header Box             |
            +----+----+----+----+----+----+----+----+-----------------------