MP4 files are container formats that can hold a mix of multimedia objects (audio, video, images, animations, menus, etc.
There is a lot of free available software that can convert avi to mp4 over the net.
Even a mistake may turn out to be the one thing necessary to a worthwhile achievement Henry Ford
If I have ever made any valuable discoveries it has been owing more to patient attention than to any other talent Isaac Newton
I have not failed Ive just found 10,000 ways that won't work Thomas Edison