DivX puzzler

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turner3d

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11. April 2006 @ 09:25

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I have been trying to figure out how to downsample the video files in the Xbox version of "The Guy Game". These files have a .top extension, but all I've been able to find out about them is that they are supposedly DivX.

Not only will they not play in any player when renamed to .avi, no program I've tried on it (Gspot, aFree, AVIToolbox, abcAVI Tag Editor, AVIcodec) has been able to extract a single piece of any kind of info other than file size.

Here's what I found by studying the .TOP vid files in a hex editor:

first 4 bytes: TOPH
first 4320 (10DFh) bytes of all the vids are identical except for:
4 bytes @ 0020h
2 bytes @ 003Ch
4 bytes @ 0040h
3 bytes @ 0078h

structure from 10E0h on:
? MARF - 4 char literal marking start of data chunk
? 2 bytes defining distance til next MARF
? 26 bytes of 0s
? DDIV (always 32 bytes after MARF) - 4 char literal marking start of video subchunk
? 2 bytes defining distance til next DDUA
? vid data
? DDUA - 4 char literal marking start of audio subchunk
? 2 bytes defining distance til next MARF
? audio data

rinse, lather, repeat

Notes:
? 2-byte distances are always LSB, MSB format
? "vorbis" appears twice in the first 165 bytes suggesting ,so it's probably safe to say that's how the audio is compressed
? there is a definite header for each vid, but it has no similarities to the standard RIFF header of DivX encoded AVIs.

Does any of this sound familiar to anybody?

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