MP3Gain

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MP3Gain
Developed by	Glen Sawyer
Initial release	?
Stable release	1.2.5  (January 8, 2005) [+/−]
Preview release	1.3.4  (January 8, 2005) [+/−]
Written in	C
OS	Cross-platform
Available in	English, Bulgarian, Catalan, Czech, Chinese (Simplified), Chinese (Traditional), Croatian, Dutch, Finnish, French, German, Greek, Hebrew, Hungarian, Italian, Japanese, Korean, Polish, Portuguese, Romanian, Russian, Serbian, Slovak, Spanish, Turkish, Uzbek[1]
Genre	Similar to an audio normalizer
License	GPL
Website	mp3gain.sourceforge.net

MP3Gain is open source cross-platform software to analyze MP3 files so that they have the same perceived volume. The net effect is similar to an audio normalizer, but unlike typical normalization MP3Gain does not modify the music data, but instead calculates a volume adjustment. The changes MP3Gain makes are lossless, as the program adjusts the mp3 file directly, without decoding and re-encoding.

MP3Gain does not simply look at the peak volume and adjust the file accordingly, but does statistical analysis to determine how loud the file actually sounds to the human ear. It changes the volume of the MP3 by raising or lowering the scale factor for each MP3 frame. Recent versions of MP3Gain can also use metadata to store information on perceived volume or volume adjustments (i.e. the results of track or album analysis). This data is stored in the APEv2 format and can be read by other applications that have implemented the ReplayGain algorithm e.g. foobar2000. Note that MP3Gain only understands APEv2 which means that other programs that store the ReplayGain data directly in the MP3 have to explicitly save it in the APEv2 tag. Example: foobar2000 users would have to activate "APE" as the preferred tag writing scheme.

[edit] See also

• Replay Gain
• SourceForge
• Audio normalization

[edit] Notes

1. ^ MP3Gain Translations. Retrieved on 2008-03-30.

[edit] External links

• Official Website
• The Mac version's webpage