BookMux

A CLI tool for merging audio tracks into M4B audiobooks.

Features

• Completely free and open source.
• Merges multiple audio files into a single .m4b.
• Support for chapters from source files.
• Loudness normalization.
• Mono/Bitrate control.

Installation

macOS & Linux

curl -sSfL https://raw.githubusercontent.com/MrZoidberg/bookmux/main/install.sh | sh

Works across bash, zsh, and fish.

Homebrew (macOS)

brew install --cask mrzoidberg/apps/bookmux

Windows (PowerShell)

irm https://raw.githubusercontent.com/MrZoidberg/bookmux/main/install.ps1 | iex

Windows (Winget)

winget install MrZoidberg.bookmux

Shell Completions

BookMux can generate shell completions for bash, zsh, and fish.

To install completions for your current shell, run:

bookmux --completion <bash|zsh|fish> --install

After installation, restart your shell or source your configuration file.

Usage

Merge a directory of audio files into an M4B audiobook:

bookmux --input ./my-book --output my-book.m4b --title "The Title" --author "The Author"

Options

• --input: Directoy or comma-separated list of files.
• --output: Resulting M4B file path.
• --normalize: Apply loudness normalization to all tracks.
• --mono: Convert output to mono (saves space).
• --bitrate: Override AAC bitrate (e.g., 64k, 96k).
• --chapters: from-files (default) or none.

Run bookmux --help for the full list of options.

License

MIT