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How do you join multiple MP3 files into one? "cat" and "mp3wrap" are no good as they produce non standard MP3 files. I know I can use audacity, but when you have 1000's of MP3 files to join into one, it takes too long.

Any suggestions?

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2 Answers

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Use ffmpeg or a similar tool to convert all of your MP3s into a consistent format, e.g.

ffmpeg -i originalA.mp3 -f mp3 -ab 128kb -ar 44100 -ac 2 intermediateA.mp3 ffmpeg -i originalB.mp3 -f mp3 -ab 128kb -ar 44100 -ac 2 intermediateB.mp3

Then, at runtime, concat your files together:

cat intermediateA.mp3 intermediateB.mp3 > output.mp3

Finally, run them through the tool MP3Val to fix any stream errors without forcing a full re-encode:

mp3val output.mp3 -f -nb
(source)

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So it's not possible to do this lossless? – oshirowanen Oct 24 '10 at 20:05
@oshirowanen maybe using VBR it's possible, did you try that? – Tobias Kienzler Aug 24 '11 at 12:56
interesting, simple catting 2 mp3 files (extracted 2CD movie audio track) automagically works, mplayer shows correct total duration – mykhal Oct 23 '11 at 21:10
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Goldwave has some batch processing capabilities, though it's shareware, not freeware.

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