Beautify Audio

One-file CLI to make tracks library-ready: convert to 320 kbps MP3, wipe old tags, retag via OneTagger Auto Tag, and rename to Artist - Title.mp3 with collision safety.

What it does:

Converts any ffmpeg-readable source to 44.1 kHz stereo 320 kbps CBR MP3 (optional loudness normalization, default -11.5 LUFS).
Strips existing metadata before retagging.
Runs OneTagger Auto Tag with onetagger-autotagger.json (Discogs/Spotify creds can be injected).
Renames the result using tagged artist/title; appends -1, -2, etc. to avoid overwrites.

Quick start

Install Python deps: pip install -r requirements.txt
Install ffmpeg and ensure it is on PATH.
Install OneTagger CLI (≥1.7). On macOS, build from source and place the resulting onetagger-cli on PATH or next to this script. https://github.com/OneTagger/OneTagger
Run: python beautify-audio.py /path/to/track.wav

Requirements

Python 3.9+.
ffmpeg on PATH.
Python deps from requirements.txt (currently mutagen).
OneTagger CLI on PATH or placed next to the script as onetagger-cli (not bundled here because it is GPL-licensed). The Auto Tag profile is provided as onetagger-autotagger.json.
The helper module onetagger_integration.py must remain in the repo root (the script prepends the parent dir to PYTHONPATH).

Usage

python beautify-audio.py /path/to/track.wav

Useful flags:

--output-dir DIR – where to place the processed MP3 (default: source folder).
--lufs -9.5 – change loudness target; use --no-loudness to disable normalization.
--artist/--title/--album – seed metadata hints for tagging/renaming.
--onetagger-cli /path/to/onetagger-cli – override CLI path (otherwise tries script folder or PATH).
--skip-onetagger – only convert/strip/rename, skip tagging.
Auth: --discogs-token, --spotify-id, --spotify-secret, or --auth-file auth.json.

Authentication resolution

Order of precedence:

CLI flags
--auth-file JSON with discogs_token, spotify_id, spotify_secret
Environment variables DISCOGS_TOKEN, SPOTIFY_CLIENT_ID, SPOTIFY_CLIENT_SECRET
auth.json next to the script (if present)

Missing Spotify/Discogs creds cause those platforms to be dropped from the config copy for that run.

Workflow

Pick output path with collision-safe suffixing.
Convert source to MP3 (optional loudness normalization).
Strip all metadata (skipped if mutagen is missing).
Optionally rename for better OneTagger filename hints.
Run OneTagger Auto Tag.
Rename final file to a sanitized Artist - Title.mp3.

Example (with credentials file)

python beautify-audio.py ~/Downloads/Track.wav \
  --output-dir ~/Music/Prep \
  --lufs -12 \
  --auth-file ~/secrets/onetagger-auth.json

Example for Automator Script (Quick Action)

set -euo pipefail

# Where the repo lives
SCRIPT_ROOT="/path/to/beautify-audio"
PY_SCRIPT="$SCRIPT_ROOT/beautify-audio.py"

# Make sure Homebrew binaries are visible (ffmpeg, etc.)
export PATH="/opt/homebrew/bin:/usr/local/bin:$PATH"

LOG_DIR="$HOME/Library/Logs"
LOG_FILE="$LOG_DIR/beautify-audio-$(date +%Y%m%d-%H%M%S).log"
mkdir -p "$LOG_DIR"

# Make sure a virtual environment with the requirements installed is available
source "$SCRIPT_ROOT/.venv/bin/activate"

{
  echo "==== $(date) ===="
  for src in "$@"; do
    echo "Processing: $src"
    /usr/bin/env python3 "$PY_SCRIPT" "$src"
  done
} >>"$LOG_FILE" 2>&1

osascript -e "display notification \"Beautify Audio finished for $# file(s).\" with title \"Beautify Audio\""

Notes

Automator-friendly: one input file in, one clean MP3 out.
If OneTagger is missing or fails, conversion and cleanup still run; renaming uses best-effort metadata.

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