KIE Seedance V1 Pro Fast (I2V)

If the pack's Kling nodes are the quality play and Seedance 2.0 is the complicated flagship, this node is the throwaway-workhorse lane: Seedance V1 Pro Fast, ByteDance's deliberately quick image-to-video model. One image, one prompt, a 5 or 10-second clip, done. It's optimized for fast iteration - the kind of node you reach for when you're testing five camera moves and only one of them needs to be good.

That's the honest use case, and it's a good one. "Fast" in the name isn't marketing; it's the model's whole positioning inside the Seedance line, which otherwise trends toward slower, higher-fidelity, more expensive runs. When you're exploring a motion idea, spending the premium on a 15-second reference-heavy masterpiece every time is how you empty a credit balance on tests. This node exists so you don't.

How it works

The simplest node in the Seedance family. Your prompt and image batch go up to the Kie.ai API - only the first image in the batch is uploaded, so if you feed it multiple frames, the first one wins - the job is submitted, and the node polls until the mp4 is ready and returns it as a ComfyUI VIDEO. Like everything else in this pack, it's a thin async client: no local model, no GPU, just credits.

Inputs

• prompt (required) - how you want the source image to animate.
• images (required) - the source; only the first frame is used.
• resolution - 720p (default, faster) or 1080p (better, slower).
• duration - 5s or 10s.
• log - console logging, on by default.

Output: a single video (VIDEO) that goes straight into SaveVideo.

Install and key setup

Standard pack install - ComfyUI Manager (search "ComfyUI-Kie-API") or:

cd ComfyUI/custom_nodes
git clone https://github.com/gateway/ComfyUI-Kie-API

Restart, then create config/kie_key.txt from config/kie_key.example.txt with your Kie.ai key. No model downloads; confirm the key with the pack's "Get Remaining Credits" node.

What to expect

• It's fast, not instant. The docs say rendering can take a minute or more depending on resolution and duration. That's still quicker than the big video models, but it's not a local-gen snap.
• First frame only. If you're used to Kling's first/last-frame control, this node doesn't have it. It's a single-anchor I2V - pick your image accordingly.
• Credit per request. Every run costs credits; there's no free preview. For "does this motion idea work" testing, prefer 720p + 5s.
• Long-run paranoia isn't warranted. The internal polling/retry defaults aren't exposed in the UI, and the 2000s timeout is generous. If a job lingers, check https://kie.ai/logs before assuming failure.

For the common workflow of "take a still from a Nano Banana grid and see if it moves," this is the cheapest door in the pack. You're paying for speed and simplicity, and that's exactly what you get.