slycer

Command-line tool to download YouTube audio and split it into chapter tracks.

Features

• Chapter-aware splitting
• Batch mode: read a file with URLs
• Cross-platform (macOS, Linux, Windows)

Requirements

• yt-dlp
• ffmpeg

If missing, slycer can install them for you (--yes).

Install

cargo install --path .
# or build locally
cargo build --release

Usage

slycer <INPUT> [flags]

Where <INPUT> is either a single YouTube URL or a path to a text file with one URL per line.

Flags

• -o, --output <FILE>: temporary combined audio file name (default: out.mp3)
• -f, --audio-format <FMT>: audio format for final tracks (default: mp3)
• -d, --dest <DIR>: destination directory for split tracks (created if missing)
• -k, --keep: keep the combined audio file after splitting
• -y, --yes: auto-install missing dependencies
• --prefix <STR>: add custom prefix to each output filename
• --prefix-name: add video title-derived prefix (first segment before -, ( or [, lowercased, sanitized, max 40 chars)
• --numbers: add zero-padded track numbers (width based on chapter count)

Examples

# Single URL
yt_url="https://www.youtube.com/watch?v=..."
slycer "$yt_url" --dest tracks --numbers --prefix=wow --audio-format m4a --yes

# Batch file
echo "https://www.youtube.com/watch?v=..." > urls.txt
echo "not-a-link" >> urls.txt
slycer urls.txt --dest out --numbers --prefix-name --yes

License

MIT — see LICENSE.