lame
Install
$ brew install lame
Check the version:
$ lame --version
LAME 64bits version 3.100 (http://lame.sf.net)
Copyright (c) 1999-2011 by The LAME Project
Copyright (c) 1999,2000,2001 by Mark Taylor
Copyright (c) 1998 by Michael Cheng
Copyright (c) 1995,1996,1997 by Michael Hipp: mpglib
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this program. If not, see
<http://www.gnu.org/licenses/>.
Usage
Convert .wav to .mp3:
$ lame -b 320 "audio.wav" "audio.mp3"