Using VLC I managed to get the audio and the video out into a single .mpeg file but the audio was too slow, so it lasted about 30 minutes but the video lasted 22 minutes...
this is a multistep process, but it gives me great results with OGM files encoded with Xvid video + ogg audio.
-I use ogmtools to demux.(this gives me an avi and an ogg file)
-itunes to convert the ogg files to comparable mp3 files.(I have the Xiph quicktime codec installed)
-ffmpegX to mux the mp3 and the avi(from the demux)
this gives me an avi file which plays great in quicktime.
to burn to DVD, i use VisualHub.