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loudness-fix

BY @BAT — 11 DOWNLOADS — AUDIO

One-shot audio mastering to streaming loudness targets (Spotify -14 LUFS, Apple Music -16, YouTube -14, broadcast -23). Two-pass ffmpeg loudnorm with true-peak limiting, preserves original quality. Works on audio files OR the audio track of a video. Use when the user asks to "master this", "fix the loudness", "make it Spotify-ready", "normalize for streaming", says a track is too quiet/loud, or needs LUFS-compliant audio for upload.

\u2606 0 DOWNLOAD ALL (.ZIP) SKILL.MD TAR.GZ V0.1.0

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curl -sS https://dem0n.vip/s/bat/loudness-fix/SKILL.md -o ~/.claude/skills/loudness-fix/SKILL.md --create-dirs

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loudness-fix

Two-pass ffmpeg loudnorm mastering. Targets the standard for whichever platform you name. True-peak limited so it won't clip on lossy codecs.

Master to a platform preset

python3 ~/.claude/skills/loudness-fix/scripts/fix.py --input track.wav --target spotify
# → track_mastered.wav at -14 LUFS, true peak -1 dBTP

Presets:

  • spotify → -14 LUFS, TP -1 (default)
  • apple → -16 LUFS, TP -1
  • youtube → -14 LUFS, TP -1
  • tidal → -14 LUFS, TP -1
  • broadcast → -23 LUFS, TP -2 (EBU R128)
  • club → -9 LUFS, TP -1 (loud, modern hip-hop / EDM)

Custom target

python3 ~/.claude/skills/loudness-fix/scripts/fix.py --input track.wav --lufs -12 --tp -1

Video files (re-mux audio at new loudness)

python3 ~/.claude/skills/loudness-fix/scripts/fix.py --input music_video.mp4 --target spotify
# → music_video_mastered.mp4 (video copy, audio loudness-fixed)

Flags

  • --input — audio or video file
  • --target — preset name (default spotify)
  • --lufs — override integrated loudness target
  • --tp — override true-peak ceiling (dBTP)
  • --lra — override loudness range (LU)
  • --output — output file (default <name>_mastered.<ext>)
  • --codec — output audio codec (default: wav for audio inputs, aac@320k for video)

How it works

  1. Pass 1: ffmpeg analyzes the file with loudnorm=print_format=json → measured LUFS/TP/LRA
  2. Pass 2: ffmpeg applies the loudnorm filter using the measured values for accurate linear normalization (better than single-pass dynamic mode)
  3. For video, the video stream is -c:v copy'd (no re-encode) and only the audio is touched

Pairs well with

  • stems — master each stem before recombining
  • cover-art + loudness-fix → release-ready single

BADGE

downloads ![downloads](https://dem0n.vip/s/bat/loudness-fix/badge.svg)

VERSIONS

  • 0.1.0 — 2.9 KB — 3bc3559b3b60

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