I have too much time on my hands, but I figured out how to make the: banner+icon, movie, and everything else the official Video Channel Creator makes... but I did it on a low-ram arm device so that's cool I guess. I got software from all over and had to compile a lot of things, but it works.
List of software used:
Audacity - DSPADPCM version
makerom
jpgvthon
some banner maker that runs on python that I can't find the original copy of
probably something else

So inquire if your main desktop happens to be a Raspberry Pi I guess.