> ## 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.

# LtxApi25AudioToVideo - ComfyUI Built-in Node Documentation

> This node generates a video that follows an audio track using the LTX 2.5 model.

This node generates a video that follows an audio track using the LTX 2.5 model. The audio determines the video duration (between 2 and 20 seconds), and you can optionally provide an image to use as the first frame. The video is generated through the LTX 2.5 API service.

## Inputs

| Parameter | Description                                                                                                                                              | Data Type | Required | Range                                 |
| --------- | -------------------------------------------------------------------------------------------------------------------------------------------------------- | --------- | -------- | ------------------------------------- |
| `audio`   | Audio track driving the video. Its length (2-20 seconds) sets the video duration.                                                                        | AUDIO     | Yes      | 2-20 seconds                          |
| `model`   | The LTX 2.5 model version to use. The resolution is chosen along with the model; both models offer the same resolution options (1920x1080 or 1080x1920). | COMBO     | Yes      | "LTX-2.5 (Fast)"<br />"LTX-2.5 (Pro)" |
| `prompt`  | A text description that guides the content of the generated video (default: ""). Must contain at least 1 character and at most 10000 characters.         | STRING    | Yes      | 1-10000 characters                    |
| `seed`    | A number that controls the randomness of the generation. The same seed produces the same result (default: 42).                                           | INT       | Yes      | Any integer                           |
| `image`   | Optional first frame to be used for the video. Only one image is supported.                                                                              | IMAGE     | No       | Single image                          |

Notes on constraints:

* The audio duration must be between 2 and 20 seconds; the node raises an error if it is outside this range.
* The prompt is required and cannot be empty.
* Only a single input image is accepted when `image` is provided.

## Outputs

| Output Name | Description                                             | Data Type |
| ----------- | ------------------------------------------------------- | --------- |
| `video`     | The generated video driven by the provided audio track. | 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/LtxApi25AudioToVideo/en.md)

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