This forum is for discussion pertaining to homebrew and indie software for the Dreamcast, such as homebrew games, emulators/interpreters, and other homebrew software/applications. Porting requests and developmental ideas are not to be made here; you can make those here. If you need any help burning discs for homebrew software, this is the place to ask as well.
Nope, dcdivx only goes up to 480x480. You will most like need 8bit audio, and you should probably use the latest divx codec. Use zacmc's tutorial for next time you encode..it will help you a lot: http://www.consolevision.com/dreamcast/dcdivx/