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6d 64 68 64 --box type mdhd
00 --version
00 00 00 --flags 
00 00 00 00 --creation_time
00 00 00 00 --modification_time
00 00 bb 80 --timescale
00 00 00 00 --duration
55 c4
00 00


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00 00 00 35 --box size
68 64 6c 72 --box type hdlr
00 --version
00 00 00 --flags 
00 00 00 00 --pre_defined
73 6f 75 6e --handler_type
00 00 00 00 --reserved3-1 
00 00 00 00 --reserved3-2
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42 65 6e 74 6f 34 20 53 6f 75 6e 64 20 48 61 6e 64 6c 65 72 00 --Name

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00 00 00 5b --box size
73 74 73 64 --box type stsd
00 --version
00 00 00 --flags
00 00 00 01 --entry_count
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6d 70 34 61 ---box type mp4a
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