🎵 Song Equalizer

Song Equalizer is a Rust-based command-line tool that uses FFmpeg to normalize the volume of all audio files in a selected directory. Perfect for fixing songs that are too loud or too quiet by bringing them all to a consistent, standard loudness.

Compatible with Windows and Linux.

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✨ Features

• 📂 Automatically scans a directory for audio files
• 📊 Normalizes volume to a target loudness level
• 🎧 Uses loudness analysis via FFmpeg (EBU R128)
• ⚙️ Supports custom equalization settings:
  • Integrated loudness target (I) – Sets desired average volume (LUFS)
  • True peak limit (TP) – Sets max allowed peak (dBTP)
  • Loudness range (LRA) – Controls the dynamic range
  • Audio quality (q:a) – Sets the output audio quality

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🛠️ Build Requirements

• Rust (latest stable version recommended)
• FFmpeg installed and available in your system's PATH (ffmpeg and ffprobe)

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📦 Building

git clone https://github.com/LeandroTheDev/song_equalizer
cd song-equalizer
cargo build --release

🚀 Usage

• Download the windows binary or linux binary
• If you are using windows you will also need to install microsoft vcredist
• Run song_equalizer
• Copy the directory that you want to equalize the songs
• Proceed to the next steps
• Result output will be stored in the same directory folder named result