[LAU] Tool to extract audio from avi file

[sed at free.fr]

ffmpeg does the trick very well.
See
http://www.catonmat.net/blog/how-to-extract-audio-tracks-from-youtube-videos/
for example (or search for 'ffmpeg audio extract' on your favorite
search engine).
To extract the audio track as it is encoded (no transform,
just pure copy extract) you do:
ffmpeg -i your_video.avi -acodec copy audio.something
Maybe the .something is relevant (ie. if you say .mp3
and data is not mp3 ffmpeg would complain). I don't know.
Maybe yuu also need to set video codec to null or something
like that. Just experiment.
The advantage as compared to mplayer is that you don't decode
the audio to uncompressed pcm data, it's a raw extract.

Take care,
Cédric.