I love watching the British show Top Gear but they rip their torrents with either Angelic or RiVER neither of which seem to work well on the Mac. I cannot hear any audio when playing the file in QuickTime. I can hear the audio if I use VLC, but the problem then arises again when I try to burn the video files to a DVD with iDVD. Can anyone offer any advice to fix this?

Also, these are video files put out by the show, they are not pirated.