The vanilla version of
sox on CentOS doesn't support the
mp3 codec. Here's a list of what it does support.
AUDIO FILE FORMATS: 8svx aif aifc aiff aiffc al amb au avr caf cdda cdr cvs cvsd
cvu dat dvms f32 f4 f64 f8 fap flac fssd gsm gsrt hcom htk ima ircam la lpc
lpc10 lu mat mat4 mat5 maud nist ogg paf prc pvf raw s1 s16 s2 s24 s3 s32 s4 s8
sb sd2 sds sf sl smp snd sndfile sndr sndt sou sox sph sw txw u1 u16 u2 u24 u3
u32 u4 u8 ub ul uw vms voc vorbis vox w64 wav wavpcm wv wve xa xi
PLAYLIST FORMATS: m3u pls
AUDIO DEVICE DRIVERS: alsa ao oss ossdsp pulseaudio
You can download the source RPM of
sox and recompile with
lame-devel libraries installed to add support for this feature.
This tutorial should help, titled: INSTALLING SOX W/ MP3 SUPPORT ON CENTOS 5.X, though it's for CentOS 5.x it should still apply. There are also steps in the comments of that post for compiling
mp3 support on CentOS 6.x.
From the comments.
The one-stop solution for CentOS 6.4 without mad or libid3tag (YMMV):
### as root
$ yum install -y sox lame
$ mkdir /usr/local/src/SoX
$ cd /usr/local/src/SoX
$ wget http://downloads.sourceforge.net/project/sox/sox/14.4.1/sox-14.4.1.tar.gz?r=http%3A%2F%2Fsourceforge.net%2Fprojects%2Fsox%2Ffiles%2Fsox%2F14.4.1%2F&ts=1366019279&use_mirror=freefr
$ tar -xvzf sox-14.4.1.tar.gz
$ cd sox-14.4.1/
$ make -s
$ make install
$ echo “include /usr/local/lib” >> /etc/ld.so.conf
Repo #1 - RPM Fusion
To be able to install
lame you'll need to add an additional YUM Repo to your mix. The repo that contains
lame is called RPM Fusion. At the time that I'm writing this the latest version of the RPM that will install the RPM Fusion repo is at: rpmfusion-nonfree-release-6-1.noarch. To install it:
$ sudo rpm -ivh http://download1.rpmfusion.org/nonfree/el/updates/6/x86_64/rpmfusion-nonfree-release-6-1.noarch.rpm
NOTE: You may need an RPM signing keys, specifically this one for EL6.
Repo #2 - EPEL
Installing the RPM Fusion repo requires another YUM repo called EPEL - Extra Packages for Enterprise Linux. You'll need to install this RPM as well, priror to installing RPM Fusion's RPM.
$ sudo rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
NOTE: The version number on this repo changes from time to time so it's best to check what the lastest one is. Currently at the time of this post the latest version was 6.8. You can see these numbers in the package name above, "epel-release-6-8.noarch.rpm".