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Frame Blend

Frame Blend · screenshot coming soon

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What this node does

Frame Blend combines each output frame with its temporal neighbors. It has two modes:
  • window — averages (or min/max/sum/product) a window of frames around the current one, optionally with a decay weighting. Good for motion trails, ghosting, and long-exposure looks.
  • shutter — simulates a virtual shutter by sampling and averaging within a time window, producing smooth synthetic motion blur.
This is a rendered stage — it needs a ▶ Run (torch/GPU backend) and requires a connected video. In goes COMFYTV_VIDEO, out comes COMFYTV_VIDEO. To hand the result to a native ComfyUI node, insert a Bridge. See bridges.md.

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When to use it

  • Add motion trails or echo to moving subjects.
  • Fake a long-exposure / light-trail look.
  • Add smooth motion blur to a clip that was rendered without it.

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Parameters

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mode

window or shutter, default window. Selects which set of controls below is used. The window/shutter mode ignores the other mode’s parameters.

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Window-mode parameters

Used when mode is window.
  • frame_min -60–0, default -5 — first frame of the blend window, relative to the current frame (negative = earlier frames).
  • frame_max 0–60, default 0 — last frame of the window, relative to the current frame (positive = later frames).
  • interval 1–10, default 1 — step between sampled frames in the window; 2 uses every other frame, etc.
  • operation one of average, min, max, sum, product, default average — how the sampled frames are combined.
  • decay 0.0–1.0, default 0.0 — weighting falloff so more distant frames contribute less (0.0 = equal weight, i.e. no decay).

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Shutter-mode parameters

Used when mode is shutter.
  • shutter 0.0–8.0 (step 0.05), default 0.5 — shutter angle / open time; larger = more motion blur.
  • shutter_type one of centered, start, end, custom, default centered — where the shutter window sits relative to the frame.
  • shutter_offset -8.0–8.0 (step 0.05), default 0.0 — shifts the shutter window in time (used with custom).
  • divisions 1–64, default 10 — number of sub-samples taken across the shutter window; more = smoother blur, slower render.

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Outputs

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Tips

  • For classic motion trails, use window with frame_min negative and frame_max 0 so it looks back in time only.
  • For smooth motion blur, use shutter and raise divisions if you see stepping in the blur.
  • interval above 1 skips frames — handy for a stroboscopic trail.
  • Glow — for a bloom, not a temporal trail.
  • Old Film — for temporal flicker rather than motion blending.