SnapOtter/apps/docs/tools/audio/audio-speed.md

description

description
Speed up or slow down audio playback with a multiplier.

Audio Speed

Speed up or slow down audio playback by applying a speed multiplier.

API Endpoint

POST /api/v1/tools/audio/audio-speed

Accepts multipart form data with an audio file and a JSON settings field.

Parameters

Parameter	Type	Required	Default	Description
factor	number	No	1.5	Speed multiplier (0.25 to 4). Values below 1 slow down; above 1 speed up.

Example Request

curl -X POST http://localhost:1349/api/v1/tools/audio/audio-speed \
  -H "Authorization: Bearer si_your-api-key" \
  -F "file=@audio.mp3" \
  -F 'settings={"factor": 2}'

Example Response

{
  "jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/audio.mp3",
  "originalSize": 4500000,
  "processedSize": 2250000
}

Notes

• A factor of 0.25 plays at quarter speed (4x longer). A factor of 4 plays at quadruple speed (4x shorter).
• Pitch is preserved while speed changes (time-stretch). Use pitch-shift to adjust pitch independently.
• Output usually keeps the input container. AAC input is written as M4A, and unsupported decode-only inputs fall back to MP3.