AACGain is a modification to Glen Sawyer's excellent mp3gain program. It supports AAC (mp4/m4a/QuickTime) audio files in addtion to mp3 files. If you are not familiar with mp3gain, stop reading this, and go to http://mp3gain.sourceforge.net.
AACGain normalizes the volume of digital music files using the Replay Gain algorithm. It works by modifying the global_gain fields in the mp4 samples. Free-form metadata tags are added to the file to save undo information, making the normalization process reversable.
AACGain uses the same command-line user interface as mp3gain, and is compatible with the mp3gain Visual Basic GUI.
Built with mpeg4ip/mp4v2 version 1.6.1. Aacgain 1.7.1 was built with
version 1.5.20. Mp4v2 version 1.6.1 corrects problems that corrupted
video files containing Quicktime chapter markers.
Built with latest mp3gain version 1.4.7 sources checked into CVS.
The mp3gain changes made since 1.7.1 support sample rates up to 96000.
Previous versions had a maxmimum sample rate of 48000.
Ignores faad2 "scalefactor out of range" errors. These errors resulted
in "invalid file format" errors on apparently good files.
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