I downloaded a movie file off the internet. The movie was in Avi format. I want to burn this movie to a DVD-R that will play in my xbox 360 and my DVD player. The only program I have so far is iDVD. Which by my understanding is used to author the movie. So do I need a program to convert avi to another format? and If so what format? and are there any programs that will do this for free?