clean-audio: Research & Knowledge for AI Agents | OpenAgentSkill

Overview

Voice/audio cleanup step of the AI Video Editor pipeline — diagnose a video's background noise, pick the right denoise method, and produce a cleaned master (voice isolated, levels preserved, video stream copied). Use when the user wants to "clean the audio / voice", "remove background noise", "denoise", "isolate voice", fix outdoor/room/water/hum/hiss noise, run ElevenLabs Voice Isolator or local RNNoise, A/B denoise methods, or produce a cleaned master for a video-N in this repo. Covers diagnosing the noise (spectrogram + levels), choosing eleven vs rnnoise by noise type, the sample A/B, tools/clean_voice.py, preserving levels (RMS-match, not LUFS), and rewiring the pipeline to the clean master. Not the SFX/music mix (that is /suggest-sfx + the final-mix step) and not the cut (that is /clean-cut).

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clean-audio — voice cleanup

Take a locked master cut and remove its background noise, producing a cleaned master whose voice sounds natural and whose visuals are untouched. Runs early (once the cut is locked) so everything downstream — TSX bake, SFX mix, final assemble — sits on the clean voice. Work with the user; the final loudness/limiting is the final-mix step's job, this step is "denoise only, levels preserved."

The engine is tools/clean_voice.py; this skill is the judgment around it: diagnose → pick method → A/B → clean → rewire.

The two methods (pick by NOISE TYPE — this is the core decision)

Method	What it is	Use when	Cost
`--method eleven`	ElevenLabs Voice Isolator (cloud ML voice/noise separation)	Dynamic, broadband noise in the voice band — outdoor running water, wind, traffic, crowd, cafe. Local tools CANNOT remove these.	~~1000 credits/min (~~$1 for a 5.5-min video); needs `ELEVENLABS_API_KEY`
`--method rnnoise --model sh` (or `cb`)	Local RNNoise via ffmpeg `arnndn` (models in `tools/models/rnnoise/`)	Stationary / mild noise (steady hiss, fan, some room tone). Free/offline. Only PARTIALLY removes dynamic noise.	free

Proven on video-1 (shot outdoors with a stream): afftdn did ~nothing, RNNoise only partially darkened the water bed, ElevenLabs removed it near-completely (pauses to near-silence, voice + breaths intact). Rule of thumb: stationary noise → try local first; dynamic broadband (water/wind/traffic) → ElevenLabs.

Inputs (read/measure first, every time)

The master — videos/video-N/reference/<cut>.mp4 (or the locked cut). Original is NEVER modified; output is a new -clean / -clean-<model> file.
The composited preview (if it exists) — videos/video-N/output/video-N-preview.mp4, to make a clean in-context preview by swapping audio (its video is identical — no re-bake needed).
videos/video-N/work/timeline.json — its master field; you rewire this to the clean master on approval.

Workflow

Diagnose the noise BEFORE choosing a method. Measure and look:
- Levels: ffmpeg -i M -vn -af astats (RMS, peak, noise floor) + ebur128 (integrated LUFS, true peak).
- Find speech-free gaps (grep edited-transcript.json for the biggest inter-word gaps) and measure the pure-noise RMS there vs speech RMS → the real SNR.
- Spectrogram: ffmpeg -i M -vn -lavfi showspectrumpic=s=1500x600:legend=1:scale=log out.png and LOOK at it. Hum = steady horizontal lines (50/60Hz) → notch. Rumble = low band → high-pass. Broadband bed that fills the voice band and fluctuates = dynamic (water/wind) → ElevenLabs. HF hiss = bright top band.
- Note if the export is already produced (compressed/normalized/peak-maxed) — it limits what's recoverable.
Decide the method with the user from the diagnosis (table above). If unsure, A/B both.
A/B on a short sample FIRST (prove before spending / committing): cut a ~15s pause-rich sample, run each candidate method, level-match them to each other, and compare — by ear (the real test) AND by spectrogram (pauses going dark = noise removed) and residual level. Let the user pick.
Clean the full master: python tools/clean_voice.py videos/video-N/reference/<cut>.mp4 --method <chosen> [--model sh] → <cut>-clean.mp4 (or -clean-<model>.mp4). Video stream COPIED (fast, non-destructive, keeps 4K60).
Levels are preserved by RMS-match, not LUFS (the tool does this). Never match integrated LUFS — it is gated and inflated by the removed noise, and over-boosts the voice into clipping. The clean file will read a lower integrated LUFS than the noisy original; that is expected (the noise was padding the number), the voice RMS is unchanged. Final loudness to -14 LUFS is the final-mix step's job.
Give the user an in-context preview (optional but recommended): swap the clean audio onto the composited preview — ffmpeg -i preview.mp4 -i <cut>-clean.mp4 -map 0:v -map 1:a -c:v copy -c:a aac -shortest preview-clean.mp4 (video identical, no re-bake). For a full A/B, also export FULL_*.mp3 scrub files.
On approval, rewire the pipeline: point timeline.json "master" at the clean file so every future bake/mix uses the clean voice; re-bake the preview if needed.

Decisions to surface to the user

Method (from the diagnosis) — and A/B if unsure.
Dead-silent gaps vs a faint ambience bed. Voice isolation removes ALL background; on an outdoor shot the dead-silent gaps can feel vacuum-sealed. Offer to add back a low-level neutral ambience if wanted.
Cost for ElevenLabs (~1000 credits/min) — confirm before running on the full master.

Principles (the house style)

Least processing that works. The goal is to remove distraction, not to make the voice sound processed. Prefer the gentlest method that clears the noise; don't over-strip a clean track.
Diagnose, then choose. The right tool depends on the noise type — never crank a denoiser blind. Local spectral/RNNoise can't separate dynamic broadband noise; that's ElevenLabs' job.
A/B before you commit (and before you spend). Prove on a sample; the user's ears decide.
Preserve levels; loudness is the final-mix step's. RMS-match with a peak ceiling, no compression here.
Non-destructive. Original master untouched; video stream copied; output is a new file.

Tooling quick reference

Clean: python tools/clean_voice.py IN.mp4 [--method eleven|rnnoise] [--model sh|cb] [-o OUT.mp4] [--no-preserve-loudness] [--keep]
Diagnose: ffmpeg -i M -vn -af astats -f null - · ffmpeg -i M -vn -lavfi showspectrumpic=... out.png (then Read the png).
RNNoise models: tools/models/rnnoise/<model>.rnnn (sh, cb).
Scratch samples/spectrograms go in the scratchpad, not the project.

Done = the noise is diagnosed, the method is chosen (A/B'd if needed), the full master is cleaned with levels preserved, the user has approved by ear, and — on approval — timeline.json points at the clean master. Update memory if a noise-type → method lesson emerges.

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File metadata

name: clean-audio
description: Voice/audio cleanup step of the AI Video Editor pipeline — diagnose a video's background noise, pick the right denoise method, and produce a cleaned master (voice isolated, levels preserved, video stream copied). Use when the user wants to "clean the audio / voice", "remove background noise", "denoise", "isolate voice", fix outdoor/room/water/hum/hiss noise, run ElevenLabs Voice Isolator or local RNNoise, A/B denoise methods, or produce a cleaned master for a video-N in this repo. Covers diagnosing the noise (spectrogram + levels), choosing eleven vs rnnoise by noise type, the sample A/B, tools/clean_voice.py, preserving levels (RMS-match, not LUFS), and rewiring the pipeline to the clean master. Not the SFX/music mix (that is /suggest-sfx + the final-mix step) and not the cut (that is /clean-cut).

View original text

---
name: clean-audio
description: Voice/audio cleanup step of the AI Video Editor pipeline — diagnose a video's background noise, pick the right denoise method, and produce a cleaned master (voice isolated, levels preserved, video stream copied). Use when the user wants to "clean the audio / voice", "remove background noise", "denoise", "isolate voice", fix outdoor/room/water/hum/hiss noise, run ElevenLabs Voice Isolator or local RNNoise, A/B denoise methods, or produce a cleaned master for a video-N in this repo. Covers diagnosing the noise (spectrogram + levels), choosing eleven vs rnnoise by noise type, the sample A/B, tools/clean_voice.py, preserving levels (RMS-match, not LUFS), and rewiring the pipeline to the clean master. Not the SFX/music mix (that is /suggest-sfx + the final-mix step) and not the cut (that is /clean-cut).
---

# clean-audio — voice cleanup

Take a locked master cut and remove its background noise, producing a **cleaned master** whose voice
sounds natural and whose visuals are untouched. Runs early (once the cut is locked) so everything
downstream — TSX bake, SFX mix, final assemble — sits on the clean voice. Work with the user; the
final loudness/limiting is the final-mix step's job, this step is "denoise only, levels preserved."

The engine is **`tools/clean_voice.py`**; this skill is the judgment around it: diagnose → pick method
→ A/B → clean → rewire.

## The two methods (pick by NOISE TYPE — this is the core decision)

| Method | What it is | Use when | Cost |
|---|---|---|---|
| **`--method eleven`** | ElevenLabs Voice Isolator (cloud ML voice/noise separation) | **Dynamic, broadband noise in the voice band** — outdoor running water, wind, traffic, crowd, cafe. Local tools CANNOT remove these. | ~1000 credits/min (~$1 for a 5.5-min video); needs `ELEVENLABS_API_KEY` |
| **`--method rnnoise --model sh`** (or `cb`) | Local RNNoise via ffmpeg `arnndn` (models in `tools/models/rnnoise/`) | **Stationary / mild** noise (steady hiss, fan, some room tone). Free/offline. Only PARTIALLY removes dynamic noise. | free |

Proven on video-1 (shot outdoors with a stream): `afftdn` did ~nothing, RNNoise only partially darkened
the water bed, **ElevenLabs removed it near-completely** (pauses to near-silence, voice + breaths intact).
Rule of thumb: **stationary noise → try local first; dynamic broadband (water/wind/traffic) → ElevenLabs.**

## Inputs (read/measure first, every time)

- **The master** — `videos/video-N/reference/<cut>.mp4` (or the locked cut). Original is NEVER modified;
  output is a new `-clean` / `-clean-<model>` file.
- **The composited preview** (if it exists) — `videos/video-N/output/video-N-preview.mp4`, to make a clean
  in-context preview by swapping audio (its video is identical — no re-bake needed).
- **`videos/video-N/work/timeline.json`** — its `master` field; you rewire this to the clean master on approval.

## Workflow

1. **Diagnose the noise BEFORE choosing a method.** Measure and look:
   - Levels: `ffmpeg -i M -vn -af astats` (RMS, peak, noise floor) + `ebur128` (integrated LUFS, true peak).
   - Find speech-free gaps (grep `edited-transcript.json` for the biggest inter-word gaps) and measure
     the pure-noise RMS there vs speech RMS → the real SNR.
   - Spectrogram: `ffmpeg -i M -vn -lavfi showspectrumpic=s=1500x600:legend=1:scale=log out.png` and
     LOOK at it. Hum = steady horizontal lines (50/60Hz) → notch. Rumble = low band → high-pass. Broadband
     bed that fills the voice band and fluctuates = dynamic (water/wind) → ElevenLabs. HF hiss = bright top band.
   - Note if the export is already produced (compressed/normalized/peak-maxed) — it limits what's recoverable.
2. **Decide the method with the user** from the diagnosis (table above). If unsure, A/B both.
3. **A/B on a short sample FIRST** (prove before spending / committing): cut a ~15s pause-rich sample,
   run each candidate method, level-match them to each other, and compare — by ear (the real test) AND by
   spectrogram (pauses going dark = noise removed) and residual level. Let the user pick.
4. **Clean the full master:** `python tools/clean_voice.py videos/video-N/reference/<cut>.mp4 --method <chosen> [--model sh]`
   → `<cut>-clean.mp4` (or `-clean-<model>.mp4`). Video stream COPIED (fast, non-destructive, keeps 4K60).
5. **Levels are preserved by RMS-match, not LUFS** (the tool does this). Never match integrated LUFS —
   it is gated and inflated by the removed noise, and over-boosts the voice into clipping. The clean file
   will read a lower integrated LUFS than the noisy original; that is expected (the noise was padding the
   number), the voice RMS is unchanged. Final loudness to -14 LUFS is the final-mix step's job.
6. **Give the user an in-context preview** (optional but recommended): swap the clean audio onto the
   composited preview — `ffmpeg -i preview.mp4 -i <cut>-clean.mp4 -map 0:v -map 1:a -c:v copy -c:a aac -shortest preview-clean.mp4`
   (video identical, no re-bake). For a full A/B, also export `FULL_*.mp3` scrub files.
7. **On approval, rewire the pipeline:** point `timeline.json` `"master"` at the clean file so every future
   bake/mix uses the clean voice; re-bake the preview if needed.

## Decisions to surface to the user

- **Method** (from the diagnosis) — and A/B if unsure.
- **Dead-silent gaps vs a faint ambience bed.** Voice isolation removes ALL background; on an outdoor shot
  the dead-silent gaps can feel vacuum-sealed. Offer to add back a low-level neutral ambience if wanted.
- **Cost** for ElevenLabs (~1000 credits/min) — confirm before running on the full master.

## Principles (the house style)

- **Least processing that works.** The goal is to remove distraction, not to make the voice sound
  processed. Prefer the gentlest method that clears the noise; don't over-strip a clean track.
- **Diagnose, then choose.** The right tool depends on the noise type — never crank a denoiser blind.
  Local spectral/RNNoise can't separate dynamic broadband noise; that's ElevenLabs' job.
- **A/B before you commit** (and before you spend). Prove on a sample; the user's ears decide.
- **Preserve levels; loudness is the final-mix step's.** RMS-match with a peak ceiling, no compression here.
- **Non-destructive.** Original master untouched; video stream copied; output is a new file.

## Tooling quick reference

- Clean: `python tools/clean_voice.py IN.mp4 [--method eleven|rnnoise] [--model sh|cb] [-o OUT.mp4] [--no-preserve-loudness] [--keep]`
- Diagnose: `ffmpeg -i M -vn -af astats -f null -` · `ffmpeg -i M -vn -lavfi showspectrumpic=... out.png` (then Read the png).
- RNNoise models: `tools/models/rnnoise/<model>.rnnn` (`sh`, `cb`).
- Scratch samples/spectrograms go in the scratchpad, not the project.

Done = the noise is diagnosed, the method is chosen (A/B'd if needed), the full master is cleaned with
levels preserved, the user has approved by ear, and — on approval — `timeline.json` points at the clean
master. Update memory if a noise-type → method lesson emerges.

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License: MIT

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Source repository: hassancs91/claude-youtube-editor
License: MIT
Version: 1.0.0
Last GitHub push: Aug 18, 2026
Registry updated: Sep 3, 2026
Instruction path: .claude/skills/clean-audio/SKILL.md @ a6ac742b4452

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

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    "summary": "No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.",
    "metrics": {
      "totalOutcomes": 0,
      "successfulOutcomes": 0,
      "failedOutcomes": 0,
      "installAttempts": 0,
      "installSuccessRate": null,
      "successRate": null,
      "recentSuccessRate": null,
      "recentFailureRate": null,
      "riskBlocked": 0,
      "setupRequired": 0,
      "notRelevant": 0,
      "avgOutputQuality": null,
      "avgTimeToUsefulMs": null,
      "productionOutcomes": 0,
      "humanReviewRequired": 0,
      "uniqueAgents": 0,
      "lastOutcomeAt": null
    },
    "signals": [],
    "penalties": [
      "No real agent outcome evidence yet"
    ]
  },
  "audit": {
    "score": 80,
    "risk_level": "risky",
    "risk_label": "Risky",
    "warnings": [
      "Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required",
      "This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.",
      "Quality score needs review"
    ]
  },
  "safety_gate": {
    "tier": "blocked",
    "label": "Blocked for auto-install",
    "auto_install_policy": "block",
    "auto_install_allowed": false,
    "human_review_required": true,
    "blocked": true,
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
  },
  "quality": {
    "score": 68,
    "label": "Promising"
  },
  "supply": {
    "track": "Research and knowledge work",
    "scenario": "Research agents",
    "maintenance": "1mo since push",
    "risk": "Risky"
  },
  "alternative_skills": [
    {
      "slug": "yanliudesign-mono-color-skill",
      "name": "mono-color",
      "url": "https://www.openagentskill.com/skills/yanliudesign-mono-color-skill",
      "stars": 1919,
      "install_command": "npx skills add yanliudesign/mono-color-skill --skill mono-color",
      "trust_score": 85,
      "audit_score": 93
    }
  ],
  "do_not_use_when": [
    "teams that need a vendor-supported SLA",
    "high-compliance environments without internal security review",
    "No OpenAgentSkill engagement data yet",
    "Audit risk risky exceeds max_risk=medium",
    "Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required",
    "This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.",
    "Quality score needs review",
    "Production credentials, payments, or irreversible account changes without explicit human review"
  ],
  "agent_contract": {
    "task_input": "Use clean-audio in an agent workflow",
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
    "install_policy": "block",
    "minimum_review_before_use": [
      "Trust: 79/100 Strong shortlist",
      "Audit: 80/100 Risky",
      "Safety: 64/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "hassancs91-clean-audio (clean-audio)",
      "install_command": "npx skills add hassancs91/claude-youtube-editor --skill clean-audio",
      "risk_summary": "Risky; Blocked for auto-install; Review before production",
      "verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
    }
  },
  "outcome_feedback": {
    "endpoint": "https://www.openagentskill.com/api/agent/outcome",
    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "hassancs91-clean-audio",
      "task": "Use clean-audio in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/hassancs91-clean-audio",
    "api": "https://www.openagentskill.com/api/agent/skills/hassancs91-clean-audio",
    "audit": "https://www.openagentskill.com/skills/hassancs91-clean-audio/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=hassancs91-clean-audio&task=Use%20clean-audio%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20clean-audio%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20clean-audio%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/hassancs91-clean-audio/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/hassancs91-clean-audio"
  }
}

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Creator: hassancs91
Source: hassancs91/claude-youtube-editor
Indexed by: OpenAgentSkill community index

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