To convert a directory of iTunes m4a format files to
mp3 we can use Debian's faad
and
lame
packages. Install them with:
$ wajig install faad lame
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You can then run the commands faad to convert to
wav format and then lame to convert to
mp3 format.
$ faad -o abc.wav abc.m4a
$ lame -h -b 192 abc.wav abc.mp3
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The -h option of lame requests the production
of higher quality output (taking more time to do so) and the
-b option results in a bitrate of 192kbps for the resulting
mp3.
A simple script can be created to transform a directory of
m4a files. You could put the following script into a
file (first line should be #!/bin/sh) and call the file
/usr/local/bin/m4a2mp3 with the appropriate permissions
(chmod a+rx /usr/local/bin/m4a2mp3). Or you can simply
select this code and paste it into a command line Terminal.
for i in *.m4a
do
faad -o - "$i" | lame -h -b 192 - "${i%m4a}mp3"
done
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The recipe iterates over all files in the current directory that match
the pattern *.m4a (i.e., all files with an extension of
m4a). The faad command is applied to each
m4a file in turn (the $i argument is quoted in
case the filenames contain spaces). The - argument to the
-o option of faad indicates that the output
should be to the standard output, which is then piped to the
lame command. The ${i%m4a}mp3 replaces the
m4a extension with the mp3 extension in
the filename.
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