GrokVideoExtendNode - ComfyUI Built-in Node Documentation - ComfyUI

The Grok Video Extend node uses an AI model to create a seamless continuation of an existing video. You provide a short video and a text prompt describing what should happen next, and the node generates a new video clip that follows on from the original.

Inputs

Common Inputs

Parameter	Description	Data Type	Required	Range
`model`	The model to use for video extension.	DYNAMIC_COMBO	Yes	`"grok-imagine-video"`
`prompt`	Text description of what should happen next in the video.	STRING	Yes	N/A
`video`	Source video to extend. MP4 format, 2-15 seconds.	VIDEO	Yes	N/A
`seed`	Seed to determine if node should re-run; actual results are nondeterministic regardless of seed (default: 0).	INT	Yes	0 to 2147483647

grok-imagine-video Inputs

Parameter	Description	Data Type	Required	Range
`duration`	Length of the extension in seconds (default: 8).	INT	Yes	2 to 10

Parameter Constraints:

The video input must be an MP4 file between 2 and 15 seconds in length and cannot exceed 50MB in file size.
The prompt must contain at least one character after whitespace is trimmed.
The model parameter is a dynamic combo. Selecting the “grok-imagine-video” option reveals the nested duration parameter.

Outputs

Output Name	Description	Data Type
`output`	The newly generated video extension.	VIDEO

This documentation was AI-generated. If you find any errors or have suggestions for improvement, please feel free to contribute! Edit on GitHub

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