The ReplaceVideoLatentFrames node inserts frames from a source latent video into a destination latent video, starting at a specified frame index. If the source latent is not provided, the destination latent is returned unchanged. The node handles negative indexing and will issue a warning if 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:**

* The `index` must be within the bounds of the destination latent's frame count. If it is not, a warning is logged and the destination is returned unchanged.
* The source latent frames must fit within the destination latent frames starting from the specified `index`. If they do not, a warning is logged and the destination is returned unchanged.

## Outputs

| Output Name | Description | Data Type |
| --- | --- | --- |
| `output` | The resulting latent video after the frame replacement operation. | 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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