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Change Video Speed with an API

Speed video up or slow it down from 0.25x to 4x with pitch-corrected audio. Run the preset directly on this page or call the same agent-ready endpoint from your product.

Run this tool View API recipe

Prefer the shell? Speed up or slow down a video with FFmpeg, the verified FFmpeg command for this edit.

LIVE TOOL
Run change video speed
Drop a video, adjust the defaults if you need to, and download the result here.

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BEFORE / AFTER

See what the tool changes.

A real example: the after side is the unedited output of a KinoPipe job. Run the live form above to generate the same result from your own media.

BeforeOriginal pace
00:09 · 1×
AfterSped up
Ready
00:04.5 · 2×

Demo footage: public-domain timelapses (Bureau of Land Management, Oregon · NASA SVS). Processed by the same pipeline the API and MCP tools call.

Useful defaults, typed options.

The tool slug stays stable while your agent supplies named media inputs and a narrow set of documented options.

  • 0.25x to 4x range
  • Audio stays natural
  • One typed request
What this preset does
  1. 01Retime video frames
  2. 02Stretch audio with pitch correction
  3. 03Keep A/V in sync
  4. 04Encode a delivery-ready MP4
Stable endpointPOST /api/v1/tools/change-video-speed
Live API request
{
  "inputs": [{ "id": "main", "url": "https://example.com/video.mp4" }],
  "options": { "factor": 2 }
}
Successful output example
{
  "result": {
    "output": {
      "filename": "change-video-speed-output.mp4",
      "contentType": "video/mp4",
      "byteSize": 437021,
      "downloadUrl": "https://cdn.kinopipe.com/…"
    }
  }
}

Know the boundaries before you run.

Factor is bounded between 0.25 and 4

About change speed

No. The audio is stretched with pitch correction, so voices stay natural at any supported factor.

Yes. A factor below 1 slows the video; 0.5 doubles its duration.

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