Change Video Speed via API

Adjust video playback speed from slow-motion to time-lapse. Speed up tutorials, create slow-motion highlights, or generate time-lapse content with synchronized audio.

Try it in your browser

Loading FFmpeg engine... (~31 MB)

Use the API

curl -X POST https://renderio.dev/v1/commands \
  -H "X-API-KEY: ffsk_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
  "ffmpeg_command": "-i {in_video} -filter_complex \"[0:v]setpts=0.5*PTS[v];[0:a]atempo=2.0[a]\" -map \"[v]\" -map \"[a]\" {out_video}",
  "input_files": {
    "in_video": "https://example.com/input.mp4"
  },
  "output_files": {
    "out_video": "output.mp4"
  }
}'

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Common Variations

Slow motion (0.5x speed)

-i input.mp4 -filter_complex "[0:v]setpts=2.0*PTS[v];[0:a]atempo=0.5[a]" -map "[v]" -map "[a]" output.mp4

4x speed (time-lapse)

-i input.mp4 -filter_complex "[0:v]setpts=0.25*PTS[v];[0:a]atempo=2.0,atempo=2.0[a]" -map "[v]" -map "[a]" output.mp4

Speed up video only (drop audio)

-i input.mp4 -vf "setpts=0.5*PTS" -an output.mp4

Related Operations

Reverse Video via API | RenderIO Trim Video via API | RenderIO Loop Video via API | RenderIO Compress Video via API | RenderIO

Need to process at scale?

Automate this with the RenderIO FFmpeg API. Process thousands of files programmatically or through no-code video automation.

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