ReplaceVideoLatentFrames - ComfyUI Built-in Node Documentation - ComfyUI

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

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