i know that people has been trying to convert the XMEN movie without success.
Well, i made it. but the burning process had several freezes and stuff like that. so i finally get what happened, cause now i have a flawless svcd in 2 disc of the XMEN movie.

in my case my room is next to the kitchen, so the ******* microwave oven generates interference so heavy that my screen jumps a little when the oven is working, i haven't noticed that till yesterday, when i was burning the movie the oven was doing my food, so i noticed the jumps, then i unplugged all electrical things but my mac, then i burned and voila everything went fine. Becareful about that, and also this damn celular phones especially nokia phones are as much killers as microwave oven, i don't know about others stuff.
all i can say is that my bedroom have a lot of electronic things conected, so maybe you must unplug everything before the burning process, at least that worked for me.