> ## 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.

# PikaSoundtrackNode - ComfyUI Built-in Node Documentation

> This node generates a synchronized soundtrack for a video with Pika.

This node generates a synchronized soundtrack for a video with Pika. The picture and the length are kept; only the audio is replaced. Describe the sound you want, or leave the instruction empty to derive it from the picture.

## Inputs

| Parameter | Description | Data Type | Required | Range |
| - | - | - | - | - |
| `video` | The clip to write a soundtrack for. Up to 10 minutes. | VIDEO | Yes | - |
| `instruction` | What the audio should be: sound effects, ambience, music or style. Leave empty to derive it from the picture. Default: "" (empty string). | STRING | Yes | 0 to 10000 characters |
| `seed` | Seed for sampling. Default: 42. | INT | Yes | 0 to 2147483647 |

**Constraints:**

* The input video must be 10 minutes or shorter.

## Outputs

| Output Name | Description | Data Type |
| - | - | - |
| `VIDEO` | The input clip with the generated soundtrack in place of the original audio. | 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/PikaSoundtrackNode/en.md)

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