I'm sure someone will be up on this sort of stuff ...
I recently edited a video that I'd taken on my old Canon compact, put a new soundtrack on it, exported it as an .avi file, burnt it to a DVD and sent to a mate ... He can't view it; he can only hear the soundtrack
Aren't all these formats cross platform compatible? I've also got some .mov's that someone has sent me that I have to convert to .avi's before I can see them in full
It's turning out to be a bit of a 'mare