How do I convert a wav file to mp3 format using sox?

Question

When I run sox directly from the command line as ;

sox -r 8000 -c 1 <wavfilename> <mp3filename>

I get the following error message:

sox: Unknown output file format for '747a.mp3': File type 'mp3' is not known

My machine is running the CentOS operating system.

Answer 1

You'll need to install an appropriate MP3 encoder, e.g. LAME, or recompile Sox with liblame support.

This is independent of your Perl programming :)

Answer 2

For CentOS you will need to recompile SOX (the base repo has the sox srpm) with the libmad and lame-devel libraries installed (rpmforge has those.) Once that is done, sox -h will list supported formats. When mp3 libraries are installed,

sox -t wav -r 8000 -c 1 -t mp3

Answer 3

More info here -

http://techblog.netwater.com/?p=4