I got the mpeg2 component and thought it would allow me to export an mpeg WITH audio and it still doesn't seem to be working? The mpeg itself plays fine in QT...I've tried eporting to DV, AVI etc.
Can't you export the audio in QT seperately? I have never worked with iDVD (as I do not have an internal superdrive), but in DVD Studio Pro you import the video and audio files seperately and they are "put together" in the authoring process.