> ## 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.

# LTX Video AlphaGen - ComfyUI Built-in Node Documentation

> Extracts a grayscale alpha matte, white for foreground, that matches the input video frame for frame.

Extracts a grayscale alpha matte, white for foreground, that matches the input video frame for frame. Feed the matte to Get Video Components and Image To Mask to turn it into a mask. Audio is not kept.

## Inputs

| Parameter | Description | Data Type | Required | Range |
| - | - | - | - | - |
| `video` | Video to matte, up to 10 seconds and 3840x2160 in either orientation. | VIDEO | Yes | - |
| `seed` | Controls whether the node re-runs; results are non-deterministic regardless of the seed. Default: 42. | INT | No | 0 to 4294967295 |

## Outputs

| Output Name | Description | Data Type |
| - | - | - |
| `matte` | The alpha matte as a video, one frame per input frame and without 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/LtxApiVideoAlphaGen/en.md)

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