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SnapOtter/apps/docs/tools/video/video-loudnorm.md
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SnapOtter 8532f3227b docs: audit all 157 tool pages against live schemas
Reconcile every tool page's parameters, defaults, and response shape against the tool's Zod settings schema and executionHint in code. Notable fixes: color-palette (add count + format params, hex output, median-cut algorithm), favicon (add 5 params, was documented as having none), qr-generate (add logoDataUri), convert (add ppm/eps/tga formats), video-loudnorm (-16 LUFS not -14), smart-crop (async 202 not sync 200), images-to-video (1080x1080 square), and several output-filename and behavior-note corrections.

Also normalize API endpoint paths to /api/v1/tools/<id> (no modality segment) and standardize curl examples on the Docker API port 1349. Verified with a clean docs build.
2026-06-18 14:12:28 +08:00

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---
description: Normalize video audio volume to broadcast standard.
---
# Normalize Audio
Normalize video audio volume to the EBU R128 broadcast loudness standard.
## API Endpoint
`POST /api/v1/tools/video-loudnorm`
Accepts multipart form data with a video file. This tool has no configurable settings.
## Parameters
This tool has no parameters. It applies EBU R128 loudness normalization to the audio track.
## Example Request
```bash
curl -X POST http://localhost:1349/api/v1/tools/video-loudnorm \
-H "Authorization: Bearer si_your-api-key" \
-F "file=@clip.mp4"
```
## Example Response
```json
{
"jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
"downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/clip.mp4",
"originalSize": 12500000,
"processedSize": 12500000
}
```
## Notes
- Uses FFmpeg's `loudnorm` filter targeting -16 LUFS integrated loudness with -1.5 dBTP true peak and 11 LU loudness range (EBU R128 broadcast standard).
- The source audio sample rate is preserved in the output.
- If the video has no audio track, the request returns a 400 error.