Well it turns off I'm terrible at putting things off. Here is a (not permanent) link to the portion of the Project Threepio files that are applicable here:
http://rapidshare.com/files/3283096184/DVD-resources.rar
The instructions are in the _README.html, in the section about converting to other formats. Hope this helps. I probably will not be able to assist in writing any more code, but I could answer questions if that helps someone else get some use out of this.