Recently at work we needed to extract audio from a Quicktime movie. In exploring different options, I came across the utility FFmpeg. This is a cross-platform utility that can decode, extract, mux, stream, filter, and convert pretty much any audio and video format to any other format. FFmpeg can be downloaded here: FFmpeg Download
FFmpeg contains over 100 codecs, so it is quite comprehensive in its ability to convert various multimedia files. FFmpeg is developed under GNU/Linux, but has also been compiled for Windows and Mac OS X
In my case, I was extracting the audio from a QuickTime video. So in Ubuntu, I just opened up the terminal program, and entered the following
$ ffmpeg -i infile.mov outfile.wav
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