I want to extract stream.dat file and the repack it, I'm working on this file about two weeks but
I couldn't found something useful, Is there anything else for that?
I don't have GT2 right now to check it out but if it's similar file to STREAM.DAT in first GT then it should contain all the videos from the game, and the only thing I can think right now is to use some video ripper like PsxMC just to rip those videos. By the what you trying to do with STREAM.DAT put custom videos?
I wonder if car and track formats from first and second GT are matching.
Most likely they're using different structure, at least I'm sure about the car's cause I looked at decompressed GT2 car and couldn't see anything similar to GT car's. Don't know about the tracks haven't check that out yet. Making similar tools for GT2 as I did for GT wont be more difficult than it was with GT tools cause I have some experience from the first game.