I have a movie that spans two DVDs. I've already ripped them and converted them to mp4s with the MactheRipper-HandBrake combo. But I now have two mp4 files for one movie. I'd like to stitch them together to make one mp4 file. I am aware that iMovie can do this, but I don't think iMovie keeps the aspect ratio? I heard QuickTime Pro can do this as well (and keep the aspect ratio), but I don't want to pony up for it.