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I have multiple Audio CDs that I want to merge into one final flac or mp3 file. For example I have 10 audio cds. I can encode each CD into its single wave/flac file, or even mp3, but then I need to join them. I cannot create one single wav file because of its limitation to 4GB. How can I create only one master big audio file ?

I must be able to do the job with a command line tool (or multiple). I tried shntool, but it doesn't work. Maybe I could do this with ffmpeg but I didn't find yet the correct command line (OSX or linux).

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  • try R64 a BWF format [or even W64 but I've never used that myself]. idk what tools you'd need to do that outside a pro DAW, but that's what to search for.
    – Tetsujin
    Jan 15, 2015 at 9:48
  • Looks like Audacity can do it, using the optional libsndfile library
    – Tetsujin
    Jan 15, 2015 at 9:53

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I found the solution for anyone who will need the solution. I use "SoX" program (http://sox.sourceforge.net/). It join/merge/append multiple audio file super easily, without transcoding them in WAV as other programs do (which put a limitation on the file size).

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  • Thanks so much - this utility is brilliant! This syntax worked for me: sox *.flac output.flac. All the files were combined into output.flac.
    – jonathanconway
    Apr 9, 2023 at 6:26

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