Kwaivgi Kling V3.0 Pro First Last Frame (Channel Edition)

Kling 3.0 Pro - the current quality benchmark from Kuaishou's AI lab (the KwaiVGI people behind LivePortrait and the whole Kling line) - in first-last-frame mode, served through SiliconFlow's BizyAir channel. FLF2V means you hand the model two images: how the video starts and how it ends. The model invents everything in between. That's a step up in control from plain image-to-video, and it's the mode people actually use when they need a scene to land somewhere specific.

You reach for this when "animate this image" isn't enough and you need a destination. Character transformation shots, scene transitions, storyboard end-frames - FLF gives you a defined narrative arc instead of hoping the model wanders somewhere good. For the price of preparing two stills, you get a video whose ending you already approved.

How it works

BizyTRD cloud wrapper. images is an autogrowing input (drop in your first and last frames), and when you upload a first frame the system auto-adapts to the image's ratio - the tooltip says aspect_ratio is optional for that reason. duration is an integer 3–15 seconds (default 5). prompt is optional but you'll want it. seed defaults to 0 with -1 for auto, and there's a sound toggle (default on) for generating sound effects with the clip. api_config overrides endpoint/key per request; skip_error outputs a placeholder instead of aborting the workflow.

Inputs and outputs

• images (required, autogrowing) - first and last frames.
• duration (required, 3–15s, default 5).
• Optional: prompt, aspect_ratio (default 9:16), seed, sound, api_config, skip_error.
• Outputs: video (VIDEO), request_id, urls.

Installing BizyAirPlus

ComfyUI Manager: "BizyAirPlus", or:

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

Restart, account at bizyair.ai, API key, BizyAirPlus button ON. Dependencies: bizyair-cloudberry, bizytrd - no models to download.

Common issues

Two things trip people up. First, frame order: the autogrowing images input takes them in order, and swapping first and last turns your narrative into a reverse playthrough - check the wire order. Second, the sound toggle: it defaults on, which is delightful until you realize every clip is billed with audio generation and you didn't need it. Turn it off for silent b-roll. Then the pack standard - missing button (pip show bizyair-cloudberry), cloud errors in the console, metered pricing. Kling Pro is one of the pricier tiers in this pack, so it's worth pinning a good seed and reusing it rather than gambling per generation.