ReplaceVideoLatentFrames - ComfyUI Built-in Node Documentation

Complete documentation for the ReplaceVideoLatentFrames node in ComfyUI. Learn its inputs, outputs, parameters and usage.

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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	Data Type	Required	Range	Description
destination	LATENT	Yes	-	The destination latent where frames will be replaced.
source	LATENT	No	-	The source latent providing frames to insert into the destination latent. If not provided, the destination latent is returned unchanged.
index	INT	No	-MAX_RESOLUTION to MAX_RESOLUTION	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).

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	Data Type	Description
output	LATENT	The resulting latent video after the frame replacement operation.