[Icecast] extracting audio data

[Geoff Shang]

On Tue, 4 Feb 2014, Guido Budack wrote:

> does anybody know if there is a (fast shell-) program that extracts audio out of a video file?
> Lets say a MPEG4-Format...

I use avconv from libav (http://libav.org), a fork of ffmpeg.

avconv -i <infile>  -vn -acodec copy <outfile>

You can run 'avconv -i <infile>' to get codec info, so you know what 
filename to use for the output filename.

Simply replace avconv with ffmpeg if you're using ffmpeg.

HTH,
Geoff.