I've been taking some MPEG movies with my new Sony digital camera. They play great in Quicktime but if I convert them to .mov, .dv, or MPEG-4 the audio gets lost. All the sound options are greyed out. I've tried demuxing the MPEG using bbDEMUX but I can't figure how to put them back together. I've tried importing the clips to iMovie but it won't accept the audio portion and I can't figure how to convert that into a format iMovie can use. Any ideas?