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Frame Interpolate

Frame Interpolate · screenshot coming soon

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What this node does

Frame Interpolate uses ffmpeg’s motion-compensated interpolation to synthesize new frames. In retime_fps mode it raises the clip to a target frame rate for smoother playback; in slowmo mode it stretches time and slows the clip down (also time-stretching the audio to match). It processes on ▶ Run and writes a new video snapshot. A source clip on video is required. In and out are both COMFYTV_VIDEO. To interoperate with native ComfyUI nodes, insert a Bridge — see the bridge guide.

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When to use it

  • Make choppy 24/30 fps footage play smoother at 60 fps.
  • Turn normal-speed footage into clean slow motion without a high-fps camera.
  • Fill in missing frames so downstream motion looks fluid.

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Parameters

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mode

retime_fps (default) changes the output frame rate; slowmo slows the clip down and stretches audio to match.

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target_fps

Target frame rate for retime_fps, 24–120, default 60. Ignored in slowmo mode.

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slow_factor

How much to slow down in slowmo mode, 2.0–8.0 (step 0.5), default 2.0. 2.0 means half speed. Ignored in retime_fps mode. In slow-mo the interpolator generates source_fps × slow_factor intermediate frames.

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mi_mode

Interpolation method: mci (motion-compensated, smoothest, default), blend (crossfade between frames), dup (duplicate frames — no true interpolation). Use mci for the cleanest result; drop to blend/dup if mci produces artifacts.

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Outputs

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Tips

  • mci can smear on fast, chaotic motion or heavy occlusion; try blend there.
  • slowmo retimes audio too (via chained atempo), so speech and music stay in sync at the slower speed.
  • Denoise before interpolating — the motion estimator handles clean footage better.
  • Video Denoise — clean footage before interpolation for better motion estimates.
  • Deinterlace — for interlaced sources, deinterlace first (its field rate already doubles frames).