Do you want a real DVD with Menus and so on that plays on a regular DVD player [go there]? Or simply a data DVD with the mp4 file on it [download this]?
Thats a folder, you have to create an iso with everything from that folder. I have a program called AnyBurn that can create an iso from a folder, just select the folder and it should work.
Tutorial: http://www.anyburn.com/tutorials/create-image-from-file.htm