I've got a 1h+ AC3 5.1 audio recording that I'd like to listen to on my Home Cinema setup. Problem, my DVD player or AppleTV won't play raw, audio-only AC3 files. I figured I could to mux the audio with a blank video and produce a valid mp4 file in Subler. Problem is, how to produce a 1h+ long blank video? I tried using Final Cut Express and iMovie, but when I import a black image and try editing its length, I cannot make it longer than 10" or so. Anything else I can try besides importing several images each 10" long up to the desired duration?