mp3gain

Install command: 
brew install mp3gain

Lossless mp3 normalizer with statistical analysis

https://mp3gain.sourceforge.net/

License: LGPL-2.1-or-later

Formula JSON API: /api/formula/mp3gain.json

Formula code: mp3gain.rb on GitHub

Bottle (binary package) installation support provided for:

macOS on
Apple Silicon		 tahoe ✅
sequoia ✅
sonoma ✅
ventura ✅
monterey ✅
big sur ✅
macOS on
Intel		 sonoma ✅
ventura ✅
monterey ✅
big sur ✅
catalina ✅
Linux ARM64 ✅
x86_64 ✅

Current versions:

stable ✅ 1.6.2

Depends on:

mpg123 1.33.3 MP3 player for Linux and UNIX

Analytics:

Installs (30 days)
mp3gain 27
Installs on Request (30 days)
mp3gain 27
Build Errors (30 days)
mp3gain 0
Installs (90 days)
mp3gain 85
Installs on Request (90 days)
mp3gain 85
Installs (365 days)
mp3gain 298
Installs on Request (365 days)
mp3gain 298