> ## 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

> Complete documentation for the HappyHorseImageToVideoApi node in ComfyUI. Learn its inputs, outputs, parameters and usage.

> 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)

## Overview

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

| Parameter          | Data Type | Required | Range                   | Description                                                                                     |
| ------------------ | --------- | -------- | ----------------------- | ----------------------------------------------------------------------------------------------- |
| `model`            | COMBO     | Yes      | `"happyhorse-1.0-i2v"`  | The HappyHorse model to use for video generation.                                               |
| `model.prompt`     | STRING    | No       | N/A                     | Prompt describing the elements and visual features. Supports English and Chinese. (default: "") |
| `model.resolution` | COMBO     | Yes      | `"720P"`<br />`"1080P"` | The output video resolution. (default: "720P")                                                  |
| `model.duration`   | INT       | Yes      | 3 to 15                 | The duration of the generated video in seconds. (default: 5)                                    |
| `first_frame`      | IMAGE     | Yes      | N/A                     | First frame image. The output aspect ratio is derived from this image.                          |
| `seed`             | INT       | No       | 0 to 2147483647         | Seed to use for generation. (default: 0)                                                        |
| `watermark`        | BOOLEAN   | No       | True / False            | Whether to add an AI-generated watermark to the result. (default: False)                        |

## Outputs

| Output Name | Data Type | Description               |
| ----------- | --------- | ------------------------- |
| `video`     | VIDEO     | The generated video file. |

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**Source fingerprint (SHA-256):** `b8764d68024b7d2a526b6cc3e1e56c3240b1aa55f31a07263e7014d4f6c67509`