> ## Documentation Index
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# ReplaceVideoLatentFrames - ComfyUI Built-in Node Documentation

> ReplaceVideoLatentFrames replaces a range of frames in a destination latent video with frames from a source latent video, starting at a specified frame index.

ReplaceVideoLatentFrames replaces a range of frames in a destination latent video with frames from a source latent video, starting at a specified frame index. If no source latent is provided, the destination latent is returned unchanged. The node supports negative indexes and logs a warning when the source frames do not fit within the destination.

## Inputs

| Parameter     | Description                                                                                                                                               | Data Type | Required | Range                               |
| ------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------- | --------- | -------- | ----------------------------------- |
| `destination` | The destination latent where frames will be replaced.                                                                                                     | LATENT    | Yes      | -                                   |
| `source`      | The source latent providing frames to insert into the destination latent. If not provided, the destination latent is returned unchanged.                  | LATENT    | No       | -                                   |
| `index`       | The starting latent frame index in the destination latent where the source latent frames will be placed. Negative values count from the end (default: 0). | INT       | Yes      | -MAX\_RESOLUTION to MAX\_RESOLUTION |

**Constraints:**

* A negative `index` is adjusted by adding it to the destination frame count, so it counts backward from the end of the destination latent.
* If `index` points beyond the destination frame count, or if the source frames do not fit within the destination starting at `index`, a warning is logged and the destination latent is returned unchanged.

## Outputs

| Output Name | Description                                                                                                                                             | Data Type |
| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------- | --------- |
| `output`    | The resulting latent video after the frame replacement operation. If the replacement cannot be performed, the destination latent is returned unchanged. | LATENT    |

> 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/ReplaceVideoLatentFrames/en.md)

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