> ## Documentation Index
> Fetch the complete documentation index at: https://docs.knouds.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Video Generator node: AI video generation

> Generate videos with AI models like Kling V3 and Seedance 2.0. Configure duration, aspect ratio, and audio. Some models require a Business tier.

The Video Generator node runs an AI video model and produces a video as output. You can drive it with a text prompt, an image-to-video workflow where a reference image is animated, or a full pipeline where upstream nodes produce both the prompt and the starting frame automatically.

## Available models

The model picker lists every enabled video model in your workspace. Seven models are available by default, organized into two model families:

**Seedance 2.0** family — high-quality text-to-video and image-to-video, multi-mode (UGC, lipsync, first-last-frame, etc.)

* **Seedance 2.0 Full Access** — the full-featured variant with every mode unlocked
* **Seedance 2 Fast** — optimized for speed
* **Seedance 2.0** — the base variant

**Kling V3 / V2.5** family — image-to-video and motion control:

* **Kling V3 Pro I2V** — image-to-video (supports an advanced 4K mode via API parameter; see callout below)
* **Kling Video v2.5 Turbo Pro** — fast turbo variant
* **Kling V3 Motion** — motion control
* **Kling O3 Pro Ref2V** — reference-to-video with style + character refs

<Note>
  Seedance 2.0 variants require a **Business tier** subscription. Workflows that include any Seedance 2.0 node show a lock badge on the template card if your account is on a lower tier. Kling models are available on Pro+.
</Note>

<Warning>
  **Kling V3 Pro 4K mode — API-only.** Kling V3 Pro accepts an optional `4k` boolean parameter that requests a 4K rendering pass instead of the default 1080p. 4K is **API/MCP/CLI-only** — it is intentionally not exposed on the canvas because 4K renders typically take **15–25 minutes** per 5-second clip, which is not a workable canvas UX. Output file sizes roughly double vs 1080p, and cost scales accordingly.

  To use 4K, call the model via the slim API with `4k: true` in the input:

  ```json theme={null}
  POST /api/models/kling-video-v3-pro-image-to-video/run
  {
    "input": {
      "start_image_url": "https://...",
      "prompt": "your prompt",
      "duration": "5",
      "4k": true
    },
    "async": true
  }
  ```

  Without the `4k` parameter (or with `4k: false`), the request renders at the standard 1080p resolution. `async: true` is strongly recommended for 4K so your client does not hold an HTTP connection open for the full render window — Knouds returns an execution id immediately and you poll via `GET /api/executions/:id`.
</Warning>

Your workspace administrator can add more video models through the Node Builder.

## Input sockets

The sockets available depend on the selected model. Common inputs include:

| Socket         | Type          | Description                                 |
| -------------- | ------------- | ------------------------------------------- |
| `prompt-in`    | Text (orange) | The generation prompt                       |
| `image-in`     | Image (pink)  | Starting reference image for image-to-video |
| `end-image-in` | Image (pink)  | Ending frame for morphing workflows         |
| `audio-in`     | Audio (cyan)  | Audio track to incorporate into the video   |
| `params-in`    | Any (purple)  | Parameter bundle from a Request Input node  |

Switching models updates the socket set. The node attempts to reconnect existing wires to compatible handles automatically.

## Output sockets

The `video-out` socket on the right side emits the generated video. Connect it to a Response Output to return it to an API caller, or to a Frame Extractor node to continue processing frames.

## Controls on the node

**First row**

* **Model picker** — select the active model.
* **Aspect ratio** dropdown — available options depend on the model (for example, 16:9, 9:16, 1:1).

**Second row**

* **Duration** dropdown — available durations depend on the model (for example, 3 s, 5 s, 10 s). Kling V3 supports up to 15 s.
* **Resolution** dropdown — appears on models that expose resolution presets.
* **Sound effects** toggle — appears on models that support AI-generated audio (for example, Kling V3). When enabled, the model generates ambient sound to match the video.
* **Settings** icon — opens the side panel for advanced configuration.
* **Run** button — run the node.

## Credit cost

The node header shows the estimated credit cost for the current settings (for example, `~56 cr`). For per-second-priced models like Kling V3, the displayed cost reflects the selected duration (for example, 5 s × rate).

## Side panel inspector

Click the **Settings** icon to open the side panel. From there you can:

* Upload start and end reference images with large tile pickers
* Edit the prompt in a full-width text area
* Adjust advanced parameters exposed by the model
* Choose output format settings

## Generation history

Past results are stored on the node. Use the arrow controls below the preview to navigate between generations, or click **All** for the full-screen gallery.

<Tip>
  Chain an Image Generator into a Video Generator to animate a freshly generated image. Connect the `image-out` socket of the Image Generator to the `image-in` socket of the Video Generator.
</Tip>