I know what you need. You need a dvd (presumably .iso) to .avi converter.
Here is the solution that is quick, easy and works great.
http://fairusewizard.com/lang_en/
You can use that program to turn a DVD into a single .avi
I've used it personally and it works. Hope this helps!
Note: Once it is an avi you can use almost any video converter to turn it to another format.
