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loudness-scanner is a tool that scans your music files according to the EBU R128 standard for loudness normalisation. It optionally adds ReplayGain compatible tags to the files.

All source code is licensed under the MIT license. See LICENSE file for details.


  • Supports all libebur128 features:
    • Portable ANSI C code
    • Implements M, S and I modes
    • Implements loudness range measurement (EBU - TECH 3342)
    • True peak scanning
    • Supports all samplerates by recalculation of the filter coefficients
  • ReplayGain compatible tagging support for MP3, OGG, Musepack, FLAC and more


  • Glib
  • taglib

input plugins (all optional):

  • gstreamer
  • libsndfile
  • libmpg123
  • ffmpeg
  • libmpcdec

optional GUI frontends:

  • GTK2 or
  • Qt


In the root folder, type:

mkdir build
cd build
cmake ..

If you want the git version, run:

git clone git://
cd loudness-scanner
git submodule init
git submodule update


Run "loudness scan" with the files you want to scan as arguments. The scanner will automatically choose the best input plugin for each file. You can force an input plugin with the command line option "--force-plugin=PLUGIN", where PLUGIN is one of gstreamer, sndfile, mpg123, musepack or ffmpeg.

The scanner also support ReplayGain tagging. Run it like this:

loudness tag <files>     # scan files as album


loudness tag -t <files>  # scan files as single tracks

Use the option "-r" to search recursively for music files and tag them as one album per subfolder.

The reference volume is -18 LUFS (5 dB louder than the EBU R 128 reference level of -23 LUFS).

Use the option "-p" to print information about peak values. Use "-p sample" for sample peaks, "-p true" for true peaks, "-p dbtp" for true peaks in dBTP and "-p all" to print all values.

The scanner supports loudness range measurement with the command line option "-l".

In "dump" mode, use the options "-s", "-m" or "-i" to print short-term (last 3s), momentary (last 0.4s) or integrated loudness information to stdout. For example:

loudness dump -m 0.1 foo.wav

to print the momentary loudness of foo.wav to stdout every 0.1s.


A tool that scans your music files and tags them with loudness information.




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