ByteDance Seedance 2.0 First Last Frame (Official Edition)

First-last-frame generation at full Seedance 2.0 quality, run in the cloud through BizyAirPlus's Official Edition route. You supply a first image and an optional last image; ByteDance's Seedance 2.0 animates the space between them and returns a video. No local model, no GPU.

This is the combination that makes the technique actually useful: FLF gives you control over the composition, and full Seedance 2.0 gives you the coherence and 1080p output that the Mini tier skips. If you've already got an image you love and want it in motion, this node is the cleanest path in ComfyUI. It's the node you reach for at the end of a project, when the shots matter - not the one for the cheap draft iterations.

How it works

An output node in BizyAirPlus's cloud layer: with BizyAirPlus ON in the action bar, it uploads your first frame (and optional last frame) plus prompt and settings to Seedance's service, and the finished clip returns to your workflow. Official Edition means the vendor's direct API route rather than BizyAir's channel - the model is identical, and which route you want comes down to your account's billing and availability.

The inputs that matter

• first_frame_url - required, typed IMAGE. The shot you're animating from.
• last_frame_url - optional, up to one image (about 30 MB). Provide it to end the video on a specific frame.
• prompt - the motion and action between the frames.
• resolution - 1080p default; the full model earns it.
• duration - COMBO, default 10 seconds.
• aspect_ratio - 16:9 default.
• seed - 0 to 2147483647 for reproducibility.
• generate_audio - on by default.

Note this node's frame inputs are single images, not lists - one first frame, one optional last frame. That's a deliberate difference from the reference-to-video node, which accepts whole batches.

The outputs

video for preview/saving, urls for the direct link, request_id for support traceability - the standard BizyTRD trio.

Installing it

In BizyAirPlus. ComfyUI Manager → "BizyAirPlus", or:

cd ComfyUI/custom_nodes
git clone https://github.com/siliconflow/BizyAirPlus.git
cd BizyAirPlus
python -m pip install -r requirements.txt

Restart, toggle ON, enter the key from bizyair.ai. It lives at ~/.BizyAirPlus/apikey.ini, or set BIZYAIR_API_KEY. Actual dependencies are the bizyair-cloudberry and bizytrd pip packages; no model downloads, no VRAM pressure - your machine is just a remote control.

Gotchas

First-run errors are the button or the key, and the ComfyUI console shows the real detail - check it before re-queueing. On the reputation front: if you've seen "is BizyAir malware?" threads, that was an old Manager auto-install mixup, fixed; SiliconFlow is a legit vendor. For the node itself, the frame-selection rule matters more than any setting: your two bookend images should match in subject, framing and lighting, or the model spends its quality budget reconciling them instead of making the motion good.