Here is a list of small video / audio editing tricks under linux.
To extract the audio from an .avi video file, use the command:
mplayer video.avi -vc dummy -vo null -af resample=44100 -ao pcm:file=ripped-audio.wavMake sure that the program oggenc is installed (in the kubuntu package vorbis-tools.
Then you can compress the .wav file with the following command:
oggenc -q4 ripped-audio.wav -o ripped-audio.oggThat's it!
Alternatively, you can try:
ffmpeg -i chapter1.avi chapter1.mp3
// Or:
ffmpeg -i chapter1.avi chapter1.wav
lame chapter1.wav chapter1.mp3