Re: Using sox as an alternative to mp3wrap to losslessly concat a dir full of mp3s?

[fmiser <fmiser@gmail.com>]

> Jonathan wrote:

> I wanted to combine all mp3 files into one in each directory
> using Ubuntu command line.
> 
> I started using a thing called MP3Wrap
> (https://sourceforge.net/projects/mp3wrap/)

> except it turns out to horribly break id3 tags, doesn't
> recognise vbr properly etc.
> 
> Is there are way of losslessly concatenating mp3 files with sox,
> or is it a job for another tool?

SoX decodes as the first step - so it will not losslessly
concatenate MP3 files.

ffmeg can do it, though.  Something like:
ffmpeg -i "concat:file1.mp3|file2.mp3" -c copy output.mp3

or create a text file with one source file per line like this:
file '/path/to/file1'
file '/path/to/file2'
file '/path/to/file3'

 and this command:
ffmpeg -i list-of-files.text -c copy output.mp3

> (The ability to unwrap the combined mp3 into individual files
> isn't a requirement, but it would be a nice thing if possible!)

If you document the timing (length) of the source files, mp3split
should be able to be used to separate them again.  But it is not a
built-in feature like it is with mp3wrap.

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