I've got a bunch of AVI video files. I'd like to demux the audio files.
I can do this one-by-one manually in Vdub or Avimux but I'm looking for a way to do them all at once. Is there an Avisynth script command to demux?

-- I know Besweet can extract and convert audio from an AVI, but that transcodes as well; I want the original audio streams.