Yes, it is possible. After a long period of searching, I managed to find a program which dumped the audio and video quickly and easily. Unfortunately, I have forgotton the name of that program.
But here is what i know:
- you can dump audio to a wave file with "mplayer -ao pcm -vc dummy -vo null <filename>"
- the program for separating audio/video streams was part of a larger package. It might have been transcode. Or maybe mjpegtools or vcdimager. It could even have been part of ffmpeg, but I don't think so.
I realise this probably isn't very helpful, but its the best i can do