You can import the m4v files from iTunes or iPhoto, or anywhere else I guess, then drag them into your current project and stitch them into one movie
After that, it would pay you to have a look at the export or sharing options to ensure that you can get the right output.
I've done it in the past and exported to iDVD, using iMovie v.4 and v.7. with some success.
That was some time ago, and I learned how to do it on the fly, so it can't be that difficult
I think that whatever you use is going to take hours, especially if QuickTime is involved
Edited by deleted (Wed 04-Mar-09 11:48:24)