> ## 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.

# HappyHorseImageToVideoApi - ComfyUI Built-in Node Documentation

> This node generates a short video from a single starting image using the HappyHorse model.

This node generates a short video from a single starting image using the HappyHorse model. You provide a first frame image and a text prompt describing the desired motion and scene, and the node creates a video that continues from that image.

## Inputs

### Common Inputs

| Parameter | Description | Data Type | Required | Range |
| - | - | - | - | - |
| `model` | The HappyHorse model to use for video generation. | DYNAMIC\_COMBO | Yes | `"happyhorse-1.1-i2v"`<br />`"happyhorse-1.0-i2v"` |
| `first_frame` | First frame image. The output aspect ratio is derived from this image. | IMAGE | Yes | 300×300 px min; 1:2.5 to 2.5:1 |
| `seed` | Seed to use for generation. (default: 0) | INT | Yes | 0 to 2147483647 |
| `watermark` | Whether to add an AI-generated watermark to the result. (advanced option; default: False) | BOOLEAN | Yes | True / False |

### happyhorse-1.1-i2v and happyhorse-1.0-i2v Inputs

Both model versions share the same set of parameters.

| Parameter | Description | Data Type | Required | Range |
| - | - | - | - | - |
| `prompt` | Prompt describing the elements and visual features. Supports English and Chinese. (default: "") | STRING | No | N/A |
| `resolution` | The output video resolution. (default: `"720P"`) | COMBO | Yes | `"720P"`<br />`"1080P"` |
| `duration` | The duration of the generated video in seconds. (default: 5) | INT | Yes | 3 to 15 |

Note: The `first_frame` image must be at least 300x300 pixels, and its aspect ratio must be between 1:2.5 and 2.5:1.

## Outputs

| Output Name | Description | Data Type |
| - | - | - |
| `video` | The generated video file. | 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/HappyHorseImageToVideoApi/en.md)

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