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My question is about converting multiple audio files from one format to another especially from .m4a to mp3. Is there any software that can do it? Also I'm interested in converting it using only Windows software.

If not multiple, single conversion solutions would also be appreciated. All I want is little or no decrease in quality of sound.

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FFMGPEG is available for Windows, is able to support variable bit rate and works really well for audio as well as video.

On a single file:

ffmpeg -i yourfilename.m4a -codec:v copy -codec:a libmp3lame -q:a 2 yourfilename.mp3

For batch conversion, with windows command line extensions:

SETLOCAL ENABLEEXTENSIONS
FOR I IN (*.m4a) DO ffmpeg -i %I -codec:v copy -codec:a libmp3lame -q:a 2 %~dpnI.mp3

If you wish to specify an output directory rather than putting files where the originals were you can replace %~dpn.mp3 with \path\to\ouput\dir\%~n.mp3 where \path\to\ouput\dir\ must be an existing directory.

Of course you can do a lot more with FFMPEG such as converting video formats, cutting and splicing video, extracting or adding soundtracks.

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I use xrecode for those kind of conversion.

The demo version work fine too.

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