JazzJackrabbit Community Forums - Compressing and Decompressing .J2V's?

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- - Compressing and Decompressing .J2V's? (http://www.jazz2online.com/jcf/showthread.php?t=18883)

Compressing and Decompressing .J2V's?

So, do any of you know how to do this? They're the movie files...

Are you sure you mean .j2m's? They're macro files, the movie files are .j2v's. Not that I'd be able to help you anyway, I know a nothing about dark paths of programming.

Whoops I mean the J2V's, my bad :P

Code:

struct j2v_header {

        char Magic[8]; //"CineFeed"

        long Filesize;

        long crc32; //Haven't actually tested this, but analogy with other files suggests a checksum.

        long Width; //640, or 320 for the low quality versions

        long Height; //480, or 200

}

After that I dunno. The next eight bytes are similar but not necessarily identical between high- and low-quality versions, so maybe it's length or something. Before each zlib block there's a long which is related to the block's length, but the blocks seem to have some extra non-zlib material after them that's also included in the value of the length longs. There's a lot of random other stuff floating around in there too, though. You could check against the JJ1 format for reference, but I doubt the two are actually too similar.

(-)(-)(-)(-) with these complicated file formats...

I wonder why he hasn't asked me yet. I'm his brother, anyway.
And no, I'm not saying I would suck at reverse-engineering file formats.

Guy asked everyone.

I meant something like asking me personally on MSN, but whatever.

or maybe go to your room?

they don't live in the same house :(