So I'm trying to make a video compilation of my favorite (non copyright-protected) horror movie scenes to play during a party. I've been going to Zamzar.com and converting youtube URL's into MPG format. They play automatically in Quicktime as soon as I download the converted file so my MacBook definitely recognizes them as video files. But both Imovie and IDVD refuse to let me drag in the files. So what I'm looking at are a whole bunch of MPG movie files I need to just string together and burn onto a DVD. Any ideas? This really shouldn't be this tough!