KIE Seedance 1.5 Pro (I2V/T2V)

If the KIE pack's video nodes were a menu, this is the one that does a bit of everything without being the fussy experimental special. KIE Seedance 1.5 Pro (I2V/T2V) will generate from a prompt alone, from a first frame, or from a text-to-video starting point - it's the previous Seedance generation, and in the pack's own words it's the higher-quality I2V/T2V workhorse (the fast V1 node is the quick-iteration option; the 2.0 node is the experimental one). For a first video pipeline on Kie.ai, this is a sensible default.

The "I2V/T2V" in the name is literal: the images input is optional. Connect it and you get image-to-video; leave it unplugged and it's pure text-to-video. One node, two jobs.

How it works

The standard KIE job lifecycle with the video timeout (2000 seconds - Seedance runs are slow, and the node polls every 10 seconds). If you connect an image it gets uploaded and used as the source; the prompt and settings go into the createTask payload; and the finished clip comes back as a ComfyUI VIDEO.

The inputs that matter

• prompt - required. This is your motion and scene description; text-to-video mode lives and dies by it.
• images - optional. Connect for I2V (first image in the batch is the source), leave empty for T2V. This one input chooses the mode, which is the neatest thing about the node.
• aspect_ratio - 1:1 default; options 1:1, 21:9, 4:3, 3:4, 16:9, 9:16.
• resolution - 480p or 720p (default 720p). Draft at 480p, finish at 720p - the credit difference is real.
• duration - 4, 8, or 12 seconds, default 8.
• generate_audio - boolean, default off. Flip it on to get sound in the clip (costs more).
• fixed_lens - boolean, default off. This is the "don't let the camera drift" control; turn it on when you want a locked shot.

Output: video, ready for preview or a saver.

Installing

Part of ComfyUI-Kie-API, installed once. ComfyUI Manager: search "ComfyUI Kie API". Or:

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

No models to download. API key at config/kie_key.txt in the pack folder (copy from kie_key.example.txt).

Where people get burned

Patience is the theme. Seedance 1.5 Pro at 720p/12s is a multi-minute job; the 2000-second timeout is not a bug, and killing the run early wastes credits you've already spent. The mode trap is subtler: if you leave images connected with an unintended frame in the batch, you've silently switched from T2V to I2V - build that input deliberately. And fixed_lens sounds like a free win but isn't always - some shots genuinely want camera movement, so treat it as a per-shot choice, not a permanent setting. Failures show up state-by-state in the console and in full at kie.ai/logs.