iTunes U: How can I extract audio from video lectures?

Question

I download lots of lectures from iTunes U. The problem is, they usually come with video and there is no audio-only version for many.

How can I, using any software available for Snow Leopard, free or paid, extract the audio from a series of video files and end up with a series of audio files?

Any ideas?

Answer 1

I suggest using Max or ffmpegx, which is a GUI for ffmpeg.

You can also automate this procedure (i.e. extracting audio from all files in a directory) by installing ffmpeg command-line tool, as shown here: http://forums.macrumors.com/showpost.php?p=12350473&postcount=42

Answer 2

Please try it with VLC, see Extract Audio in the Videolan wiki.