[FFmpeg-user] reduce file size: extract audio from mp4 (video)

[Carl Eugen Hoyos]

Beeblebrox <zaphod <at> berentweb.com> writes:

> Output #0, mp3, to 'audio.mp3':

> Stream #0:0(und): Audio: aac 

As explained, you cannot mux aac into a mp3 
container.

If you cannot use mplayer -dumpaudio, use 
$ ffmpeg -i input -acodec copy out.aac

For future questions:
Please always provide the command line you 
tried together with the complete, uncut 
console output, do not post an excerpt of 
the console output.

Carl Eugen