Pretty much what I'm after is a way to have bullet patterns from bosses, rendered/animated in a movie file, without TH's HUD, on-screen character, enemies, etc. I haven't the slighest idea how to go about doing that though, but maybe someone here does?
Specifically, I would want to use something like this for a Windows Dreamscene (Dreamscene is an animated background for your Desktop, provided from movie files, for those who didn't know).