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I’ve got many, many mp3 files that I would like to merge into a single file. I’ve used the command line method
copy /b 1.mp3+2.mp3 3.mp3 but it’s a pain when there’s a lot of them and their namings are inconsistent. The time never seems to come out right either.
As Thomas Owens pointed out, simply concatenating the files will leave multiple ID3 headers scattered throughout the resulting concatenated file – so the time/bitrate info will be wildly wrong.
You’re going to need to use a tool which can combine the audio data for you.
mp3wrap would be ideal for this – it’s designed to join together MP3 files, without needing to decode + re-encode the data (which would result in a loss of audio quality) and will also deal with the ID3 tags intelligently.
The resulting file can also be split back into its component parts using the mp3splt tool – mp3wrap adds information to the IDv3 comment to allow this.