MP3 Normalizer based on ReplayGain

About application

The idea was to create a console app that will normalize track or album of tracks. Written in Rust programming language, our application uses multithreaded support, to give users fast normalization.
Project was based on replay gain, modifying peak and gain difference tags in MP3 file.

• Gain difference was calculated by measuring effective power of the waveform (RMS) substracted by some loudness constant (our default is 89.0 dB)
• Peak was calculated by measuring the amplitude of the track/album, divided by the maximum aplitude possible a track can have

Run

Download the latest mp3_normalizer.zip from releases, and put mp3_normalizer file into /usr/local/bin.

Usage examples:

mp3_normalizer -i <INPUT_TRACKS_OR_FOLDER_PATHS>

mp3_normalizer -i <INPUT_TRACKS_OR_FOLDER_PATHS> -o <OUTPUT_FOLDER_PATH> -nt 4 -a

mp3_normalizer -i music_folder1 music_folder2 input.mp3 -o music_output_folder -nt 4 -a

Features

• Normalize on preffered loudness
• Based on ReplayGain standard for normalization
• Multithreaded support for increased speed
• Additional command line argument support to further help user specify their use case

Command line featuers

• -i Specify input folder
• -o Specify output folder
• -nt Number of threads
• -l Set loudness
• -st Set track replay gain
• -sa Set album replay gain
• -r Remove tags
• -a Album replay gain
• -ad Directory replay gain
• -show Open output directory
• -sd Shut down PC after finishing
• -hi Hibernate
• -sl Sleep after finishing

Used Techonologies

Whole application is written and developed in Rust

Rust dependencies and their versions

• walkdir = "2"
• system_shutdown = "4.0.1"
• id3 = "1.7.0"
• minimp3 = "0.5.1"
• rayon = "1.7.0"