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A video node shows only the handles its selected model can use, so the ports change when you switch models or variants. Which handle you wire to decides how the upstream asset is used.

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Duration

Set Duration in the node toolbar or the right-hand Generation settings panel. Both controls show the duration used for generation. When you have not selected a duration, the model’s configured default applies; otherwise it starts at the shortest supported duration. Seedance 2.5 starts at 4 seconds. Choosing a longer duration in either control updates the next generation. Models driven by an input clip or audio track use that input’s duration instead. For Seedance 2.5 with exactly one video input and no image or audio references, Duration shows Auto and cannot be edited. The model chooses the output length. The credit quote and upfront charge use the source clip’s duration, rounded up to whole seconds, plus the input-video charge. If the source duration is unavailable, the quote uses the model’s default duration. Adding another reference restores the manual duration control.

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Input video limits

Duration controls the generated output. Input videos have separate limits that depend on the selected model and mode. For example, Wan 3.0 can generate up to 30 seconds, but accepts at most 15 seconds of reference video in total. If an input clip is too long or too short, the error names the model, its input-duration limit, and your clip’s length. Trim the connected input video or use a longer clip as directed; changing the output Duration does not change the input limit. Video-count errors also tell you how many clips the model accepts.

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Input handles

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Pairing rules

  • A last frame only works alongside a starting frame. A last-frame-only run is rejected with “Starting frame and last frame must be used together.”
  • Frames and reference images are mutually exclusive unless the model accepts both — for example Kling 3.0 Omni’s reference-to-video variant.
  • Each model caps how many image and reference-image inputs it accepts. Wiring more than the cap is rejected.

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Output handles

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Shot chaining

To produce a multi-shot sequence:
  1. Create your first video node and run it.
  2. Add a second video node downstream.
  3. Drag from the first node’s Last frame output to the second node’s Starting frame input.
  4. Prompt the second node with how the action should continue.
Each shot picks up exactly from the previous shot’s last frame, so motion and composition stay consistent. To carry a character or style across shots instead of an exact frame, wire the same image into every node’s Reference image handle.
Last modified on September 10, 2026