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SnapOtter/apps/docs/tools/video/replace-audio.md
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SnapOtterandGitHub 00b651c9f8 feat(i18n): 21-language pipeline, landing/docs/API wiring, landing+API translations
Shared Claude Code translation pipeline (scripts/i18n, no API key) plus Astro/VitePress/Scalar i18n wiring. Landing and API reference translated into all 20 languages; docs i18n wiring + English source anchors. The translated docs markdown (apps/docs/<locale>/**, 3,620 files) follows in a companion PR because it exceeds GitHub's per-PR CI file limit.
2026-07-11 13:01:55 +08:00

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---
description: Swap the audio track of a video with another file.
---
# Replace Audio {#replace-audio}
Swap the audio track of a video with an audio file. Upload both a video and an audio file.
## API Endpoint {#api-endpoint}
`POST /api/v1/tools/video/replace-audio`
Accepts multipart form data with exactly two files: a video file followed by an audio file.
## Parameters {#parameters}
This tool has no settings parameters. Upload a video file and an audio file as two `file` parts.
## Example Request {#example-request}
```bash
curl -X POST http://localhost:1349/api/v1/tools/video/replace-audio \
-H "Authorization: Bearer si_your-api-key" \
-F "file=@clip.mp4" \
-F "file=@voiceover.mp3"
```
## Example Response {#example-response}
```json
{
"jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
"downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/clip.mp4",
"originalSize": 12500000,
"processedSize": 13100000
}
```
## Notes {#notes}
- Exactly two files must be uploaded: the first must be a video, the second must be an audio file.
- If the audio file is longer than the video, it is trimmed to match the video duration. If shorter, the remaining video plays in silence.
- The video stream is copied without re-encoding, so there is no video quality loss.