MPlayer's Dump Stream Formats
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Designed by Alex & Arpi

The file starts with a variable size header:
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32-bit  Stream format fourcc (MPVS or MPAS)
       MPVS = MPlayer Video Stream
       MPAS = MPlayer Audio Stream
8-bit   Demuxer type (AVI,MOV,ASF,REAL,...)
8-bit   Flags (marks  dumped headers)
       Values: 0x1:  WAVEFORMATEX
               0x2:  Audio extra codec data
               0x4:  BITMAPINFOHEADER
               0x8:  QT's ImageDesc
               0x16: indicates 32-bit chunk size before every data chunk
16-bit  Length of headers

There's strict rule in the follow-up of the codec-headers.
Depending on flags,

Data chunks:
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32-bit  Optional 32-bit chunk size
..     Data