audio-loudness-normalization: Design & UI for AI Agents | OpenAgentSkill

Overview

Normalizes a single audio file to consistent LUFS loudness with true-peak limiting using FFmpeg. Use when the user wants loudness normalization, volume matching, unified audio levels, SFX/UI/BGM leveling, or mentions LUFS, true peak, loudnorm, or inconsistent game audio.

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Audio Loudness Normalization

Loudness-normalize one audio file to a target LUFS with true-peak limiting. Preserves input format — same extension and sample rate as the source. Directories are not supported; run once per file to process a folder.

Rules

When this skill applies, read and follow skill-dependency-manager — run scripts as documented, install missing tools into .dependency/.

Quick Start

Default: -14 LUFS, -1.5 dBTP, output to <audio-dir>/audio-loudness-normalization/<audio-name>:

.dependency/python/python .ai/audio-loudness-normalization/normalize.py --audio path/to/audio.wav

Example: audio/sfx/tank/tank_move.wav → audio/sfx/tank/audio-loudness-normalization/tank_move.wav

LUFS Targets

Category	LUFS
UI / clicks	-18 to -14
Gameplay SFX	-16 to -12
Explosions	-12 to -8
Ambience	-22 to -18
BGM / voice	-16 to -14

One category per folder. Mixed folders: split first, then normalize each file with matching -t.

Common Flags

--audio · -t / --target-lufs · -output

.dependency/python/python .ai/audio-loudness-normalization/normalize.py --audio Audio/SFX/click.wav -t -14

Never overwrite source files. The script writes only to audio-loudness-normalization/ (or -output). Supported inputs: .wav, .mp3, .ogg, .flac, .aac, .m4a, .wma.

Agent Notes

Use the bundled script (two-pass loudnorm), not hand-written FFmpeg.
Preserves input format — same extension and sample rate (-ar forced to source); does not resample.
Missing Python/FFmpeg → populate .dependency/ per skill-dependency-manager, retry same command.
Do not copy, move, or replace the source with the normalized output — tell the user where audio-loudness-normalization/ files are; they swap assets manually when ready.
Do not use -output pointing at the source file; the script refuses paths that would overwrite the input.
Do not fix uneven levels with per-asset volume in game code — re-normalize sources.
Engine bus defaults and rationale: reference.md

Tests

From repo root:

.dependency/python/python .ai/audio-loudness-normalization/test_normalize.py

Manual CLI examples: cli/audio-loudness-normalization.md

View source ↗

File metadata

name: audio-loudness-normalization
description: Normalizes a single audio file to consistent LUFS loudness with true-peak limiting using FFmpeg. Use when the user wants loudness normalization, volume matching, unified audio levels, SFX/UI/BGM leveling, or mentions LUFS, true peak, loudnorm, or inconsistent game audio.

View original text

---
name: audio-loudness-normalization
description: Normalizes a single audio file to consistent LUFS loudness with true-peak limiting using FFmpeg. Use when the user wants loudness normalization, volume matching, unified audio levels, SFX/UI/BGM leveling, or mentions LUFS, true peak, loudnorm, or inconsistent game audio.
---

# Audio Loudness Normalization

Loudness-normalize one audio file to a target LUFS with true-peak limiting. **Preserves input format** — same extension and sample rate as the source. Directories are not supported; run once per file to process a folder.

## Rules

When this skill applies, read and follow [skill-dependency-manager](../skill-dependency-manager.md) — run scripts as documented, install missing tools into `.dependency/`.

## Quick Start

Default: **-14 LUFS**, **-1.5 dBTP**, output to `<audio-dir>/audio-loudness-normalization/<audio-name>`:

```bash
.dependency/python/python .ai/audio-loudness-normalization/normalize.py --audio path/to/audio.wav
```

Example: `audio/sfx/tank/tank_move.wav` → `audio/sfx/tank/audio-loudness-normalization/tank_move.wav`

## LUFS Targets

| Category | LUFS |
|----------|------|
| UI / clicks | -18 to -14 |
| Gameplay SFX | -16 to -12 |
| Explosions | -12 to -8 |
| Ambience | -22 to -18 |
| BGM / voice | -16 to -14 |

One category per folder. Mixed folders: split first, then normalize each file with matching `-t`.

## Common Flags

`--audio` · `-t` / `--target-lufs` · `-output`

```bash
.dependency/python/python .ai/audio-loudness-normalization/normalize.py --audio Audio/SFX/click.wav -t -14
```

**Never overwrite source files.** The script writes only to `audio-loudness-normalization/` (or `-output`). Supported inputs: `.wav`, `.mp3`, `.ogg`, `.flac`, `.aac`, `.m4a`, `.wma`.

## Agent Notes

1. Use the bundled script (two-pass `loudnorm`), not hand-written FFmpeg.
2. **Preserves input format** — same extension and sample rate (`-ar` forced to source); does not resample.
3. Missing Python/FFmpeg → populate `.dependency/` per skill-dependency-manager, retry same command.
4. **Do not copy, move, or replace the source with the normalized output** — tell the user where `audio-loudness-normalization/` files are; they swap assets manually when ready.
5. Do not use `-output` pointing at the source file; the script refuses paths that would overwrite the input.
6. Do not fix uneven levels with per-asset volume in game code — re-normalize sources.
7. Engine bus defaults and rationale: [reference.md](reference.md)

## Tests

From repo root:

```bash
.dependency/python/python .ai/audio-loudness-normalization/test_normalize.py
```

Manual CLI examples: [cli/audio-loudness-normalization.md](../../../cli/audio-loudness-normalization.md)

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Review before install: Avoid automatic install

License: MIT

Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required
AI review approval is missing
This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.
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Stars/forks activity: 152 stars, 14 forks; issue activity unavailable in current metadata
Review status: AI review approval is missing

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Source & usage notes

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Source repository: godot-fun/godot-agent
License: MIT
Version: Unknown
Last GitHub push: Sep 12, 2026
Registry updated: Sep 12, 2026
Instruction path: .cursor/skills/audio-loudness-normalization/SKILL.md @ 29d64ba1ebad

Version reported in registry metadata; check source releases before relying on it.

Quality

63/100

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