mp3rgain is a modern Rust reimplementation of the classic mp3gain tool. It adjusts MP3 volume losslessly by rewriting the per-frame global_gain field according to ReplayGain analysis, without re-encoding audio data. It also supports lossless AAC/M4A global_gain rewriting, making it a safe replacement for the unmaintained aacgain port.

WWW: https://github.com/M-Igashi/mp3rgain
