loudgain is a loudness normalizer that scans music files and calculates loudness-normalized gain and loudness peak values according to the EBU R128 standard, and can optionally write ReplayGain-compatible metadata.

[EBU R128] EBU is a set of recommendations regarding loudness normalisation based on the algorithms to measure audio loudness and true-peak audio level defined in the [ITU BS.1770] ITU standard, and is used in the (currently under construction) ReplayGain 2.0 specification.

loudgain implements a subset of mp3gain's command-line options, which means that it can be used as a drop-in replacement in some situations.

loudgain is (mostly) compatible with mp3gain's command-line arguments (the -r option is always implied). Here are a few examples:

$ loudgain *.mp3            # scan some mp3 files without tagging
$ loudgain -s i *.mp3       # scan and tag some mp3 files with ID3v2 tags
$ loudgain -d 13 -k *.mp3   # add a pre-amp gain and prevent clipping
$ loudgain -s r *.mp3       # remove ReplayGain tags from the files

See the man page for more information.

• libavcodec
• libavformat
• libavutil
• libebur128
• libtag

loudgain is distributed as source code. Install with:

$ mkdir build && cd build
$ cmake ..
$ make
$ [sudo] make install

Copyright (C) 2014 Alessandro Ghedini alessandro@ghedini.me

See COPYING for the license.