Linux Convert an MP3 File to WAV Format

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How do I convert an MP3 file to WAV format under Linux using a shell prompt?

There are plenty of tools that to convert an MP3 file into WAV format. I recommend mpg321 which is a free command-line mp3 player, which uses the mad audio decoding library.

Install mpg321 or mpg123

Type the following command under Debian / Ubuntu Linux, enter:

sudo apt-get install mpg321

OR

sudo apt-get install mpg123

I recommend using mpg123 as it is updated frequently.

Install mpg123 under CentOS / RHEL / Fedora Linux

Turn on rpmforge repo and type the following command:

yum install mpg123

Convert an MP3 to WAV

The -w option will convert an .mp3 file to .wav file. The syntax is:

mpg123 -w output.wav input.mp3

OR

mpg321 -w output.wav input.mp3

A Sample Shell Script Helper Function

Add the following to your ~/.bashrc startup file (tested with bash v3.x+):

mp3towav(){
	[[ $# -eq 0 ]] && { echo "mp3wav mp3file"; exit 1; }
	for i in "$@"
	do
		# create .wav file name
		local out="${i%/*}.wav"
		[[ -f "$i" ]] && { echo -n "Processing ${i}..."; mpg123 -w "${out}" "$i" &>/dev/null  && echo "done." || echo "failed."; }
	done	
}

Use it as follows:

mp3towav *.mp3
mp3towav "this is a test.mp3"
ls *.wav

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin and a trainer for the Linux operating system/Unix shell scripting. He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector. Follow him on Twitter, Facebook, Google+.

15 comment

    1. You didn’t look before hey? Copy/paste is good but one has to make sure to evaluate/understand before using! Enough said, happened to me too hahahahhaha. I solve the “potential issue” by replacing:

      echo “mp3wav mp3file”; exit 1;

      by

      echo “usage: mp3towav filenames”;

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