Moitah has done an absolutely brilliant job with mpeg4modifier and has knowledge/skills >>> than I. I'm betting it'll never be able to reach motiah's heights.
I am currently looking at vb6 commandline version 0.1a which only does a form of pack/unpack on well-formed mpeg4-asp+mp3 AVIs. If I had C skills and a C compiler it might be easier... but I don't. The raw non-microsoft-api avi (riff file) parsing/demuxing seems to be working in debug mode for <1Gb files so far, I must take a look at mpeg4modifier to see how motiah did it. So far I have zero google hits for VB mpeg4-asp parsing code to help me on my way
