Seedance图生视频

Seedance is ByteDance's video model - semantic understanding, obedient camera moves, and it can take an existing image and animate it without fighting the style of your first frame. It's also closed and API-only, which is where this node comes in: it wraps the Seedance image-to-video endpoint so your ComfyUI graph can turn a still into a 10-second moving shot. For product people this is the "make the hero image a video" button, and it slots into a ComfyUI workflow instead of a separate web tool.

How it works

You feed a first_image; the node base64-encodes it, bundles your prompt, resolution, aspect ratio, duration and seed, and POSTs to the pack's gateway under the model id DreaminaI2VNode. The video is rendered server-side and returned as a VIDEO tensor you can save or preview. Two behaviors from the README are worth internalizing before you queue:

• camerafixed - when on, the model ignores camera-movement words in your prompt and holds a fixed shot. Turn this on when you want the subject to move and the camera to stay put, off when you're writing dolly/push-in/pan directions.
• last_image (optional) - wire one in and you get first-frame → last-frame animation (the model interpolates between the two). Leave it empty and you get a plain image-to-video, with the model deciding where it ends.

The inputs that matter

• first_image (IMAGE) - required. This is your seed still; its style carries into the motion.
• prompt (STRING) - motion instructions. Seedance follows natural language well, including Chinese.
• resolution (480P / 720P / 1080p) and Size (1:1, 3:4, 4:3, 9:16, 16:9, 21:9) - output framing.
• duration (INT, 3–12, default 10) - seconds. Note the README markets 3–10s at 24fps, but the node lets you go to 12.
• camerafixed (BOOLEAN) and seed (INT) - as above.

One output: video (VIDEO).

Installing it

Part of comfyui-MJAPI-party. ComfyUI Manager → "mojieapi_party" → Install → restart, or:

cd ComfyUI/custom_nodes
git clone https://github.com/MoJIeAIGC/comfyui-MJAPI-party.git

Register at mojieaigc.com and put your key in config.ini (keep the BASE_URL line as shipped):

[API]
KEY = your_api_key
BASE_URL = https://www.mojieaigc.com/v1/completions

Restart. No model downloads, no video-CUDA deps - the output VIDEO type is handled by ComfyUI itself.

Common issues

• Video calls are the expensive ones. This is where the "metered API" reality bites hardest - a 10-second 1080p clip costs a real slice of your balance, and the community's complaint about API-video pricing generally ("and it's extremely expensive") applies to Seedance specifically. Preview at 480P until you like the take, then pay for 1080p.
• The camera moves on you. If you asked for a fixed shot and got motion anyway, you left camerafixed off and Seedance read your prompt's implicit movement. Flip it on.
• Last-frame looks unrelated to the first. First/last-frame interpolation works best when the two images share composition. If they're wildly different scenes, expect an awkward in-between.
• Error image with text - the pack's standard failure display; usually key, balance, or a timeout on a long render.