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Old 08-03-2014, 03:22 AM   #1
Registered: Jun 2012
Distribution: Linux Mint - Debian Edition
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M4B to MP3 Convertion

Hi there,

I've got some M4b files I would like to convert to Mp3. I've searched and found this little piece of code
faad --stdio DTF.m4b | lame --preset standard - DTF.mp3
But it only returns this:
Unable to find correct AAC sound track in the MP4 file.
Warning: unsupported audio format
Can anyone offer any help or advice?

Old 08-03-2014, 12:29 PM   #2
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You can give VLC a try. It looks like there is no need to convert the file, VLC can play .M4A and .M4B formats. See this link.

Old 08-03-2014, 03:39 PM   #3
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@ NotAComputerGuy

ffmpeg can decode m4a files quite easily. But, I'm sure about m4b. It depends on the version of ffmpeg and what decoders/encoders was compiled into the binary.

You can check the decoders/encoders used by ffmpeg by typing this at the terminal

ffmpeg -formats | egrep -i 'm4a|m4b'
To convert m4a files, type this

ffmpeg -i input_file.m4a -acodec libmp3lame output_file.mp3
Ffmpeg will use the audio values of the input file for the mp3 file, If you want to change the audio quality of the mp3 file, you can use these switches

-ab = audio bitrate # example -ab 192k
-ar = audio frequency # example -ar 48000
-ac = audio channels # example -ac 2

Note: On some distros, ffmpeg is depreciated and avconv is the replacement for it. However, avconv is compatible with ffmpeg switches as well.

Last edited by David.V; 08-03-2014 at 03:46 PM.
Old 08-11-2014, 11:54 AM   #4
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I found the problem to this. Stupidly I bought them from a legitimate source: iTunes. This means I'm not allowed to use them with any other device. It's the DRM that means I cannot change the format.
Old 08-11-2014, 12:59 PM   #5
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Also note that iTunes watermarks files e.g. you should be able to hear a faint hissing noise in the background, this would be your identifying info embedded into the audio.
1 members found this post helpful.
Old 08-11-2014, 01:01 PM   #6
Registered: Jun 2012
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Wonderful to know! I'm sure that illegitimate sources of media wouldn't have this.


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