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I'm looking for a volume normalizer, which can be fed with a directory and then:

  • analyse all .mp3 files in that directory,
  • calculate normalized volume value, equal for all files,
  • batch-rewrite all files, setting volue to that calculated medium value.

This looked as a good idea for the first moment, but it is for Android and not available in my country.

Do I have any other alternatives?

  • 1
    Take a look at Audacity. I believe you can set up a batch process or chain to normalize and rewrite all files in a directory. – Mr Public Feb 1 '17 at 17:41
  • Sounds like a good idea. I'm using Audacity, but had no idea that it is able to do batch-processing job. Why comment, instead of an answer? – trejder Feb 2 '17 at 19:20
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since you only need normalizing for mp3-files, you can take a look at wxMP3gain:

  • uses replay-gain (therefor no generation-loss)
  • add a file or folder for processing
  • if you want, you can just analyze the files
  • displays and avoids (if configured to do so) clipping
  • is capable of doing all in one when configured to do so

wxMP3gain: main window


or maybe you want to try the original (but old) MP3Gain:

  • it is petty old, but should work anyway (and the mp3-format is even older! --> use opus instead!)
  • it is very similar to wxMP3gain but seems to be not developed for quite a while now (can be considered as predecessor of wxMP3gain)
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Audacity has what you are looking for. You can chain/batch process a directory of files and use the Normalize function on all of them to normalize audio equally against all tracks that you want. Since it appears that you are running on Windows, you might need to get Lame for Audacity to work with and export .mp3 files.

Audacity batch processes uses chains, which can be found through File -> Edit Chains. Then, apply the chain (File -> Apply Chain) to the audio files you want batch processed and normalized.

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