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

# RunwayImageToVideoNodeGen3a - ComfyUI Built-in Node Documentation

> Runway Image to Video (Gen3a Turbo) node generates a video from a single starting frame using Runway's Gen3a Turbo model.

Runway Image to Video (Gen3a Turbo) node generates a video from a single starting frame using Runway's Gen3a Turbo model. It takes a text prompt and an initial image frame, then creates a video sequence based on the specified duration and aspect ratio. The generation is processed remotely through Runway's API. This node is marked as deprecated.

## Inputs

| Parameter | Description | Data Type | Required | Range |
| - | - | - | - | - |
| `prompt` | Text prompt for the generation (default: "") | STRING | Yes | N/A |
| `start_frame` | Start frame to be used for the video | IMAGE | Yes | N/A |
| `duration` | Duration of the generated video, in seconds (default: "5") | COMBO | Yes | `"5"`<br />`"10"` |
| `ratio` | Aspect ratio of the generated video (default: "768:1280") | COMBO | Yes | `"768:1280"`<br />`"1280:768"` |
| `seed` | Random seed for generation (default: 0) | INT | Yes | 0 to 4294967295 |

**Parameter Constraints:**

* The `prompt` must contain at least one character (it cannot be empty).
* The `start_frame` accepts a single image (maximum of 1).
* The `start_frame` must not exceed 7999 x 7999 pixels in dimensions.
* The `start_frame` must have an aspect ratio between 1:2 and 2:1 (0.5 to 2.0).

## Outputs

| Output Name | Description | Data Type |
| - | - | - |
| `output` | The generated video sequence | VIDEO |

> This documentation was AI-generated. If you find any errors or have suggestions for improvement, please feel free to contribute! [Edit on GitHub](https://github.com/Comfy-Org/embedded-docs/blob/main/comfyui_embedded_docs/docs/RunwayImageToVideoNodeGen3a/en.md)

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