Dump audio from video without re-encoding.

ffmpeg -i file.ext -acodec copy -vn out.ext
This removes the video and subsequent file size and directly copies the audio.
Sample Output
~$ time ffmpeg -i file.ogv -acodec copy -vn out.ogv

size=   14356kB time=00:28:57.99 bitrate=  67.7kbits/s    
video:0kB audio:14207kB subtitle:0kB other streams:0kB global headers:4kB muxing overhead: 1.047248%


~$ time ffmpeg -i file.ogv -acodec libvorbis -vn out.ogg

size=   14186kB time=00:28:58.00 bitrate=  66.9kbits/s    
video:0kB audio:14036kB subtitle:0kB other streams:0kB global headers:4kB muxing overhead: 1.066920%

real	0m47.875s

2014-04-25 14:24:57

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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