RunwayAleph2KeyframeNode - ComfyUI Built-in Node Documentation

This node anchors a guidance image to a specific moment of your input video, so the Aleph2 model steers the edit at that point in your footage. Connect this node to the “keyframes” input of the Runway Aleph2 Video to Video node, and chain several together (up to 5) via the optional “keyframes” input.

Inputs

Parameter	Description	Data Type	Required	Range
`image`	The guidance image to apply at the chosen moment of the input video.	IMAGE	Yes	-
`timing`	How to place this image on the input video’s timeline.	COMBO	Yes	”Absolute seconds" "Fraction of duration”
`keyframes`	Optional earlier keyframes to chain with this one.	KEYFRAME	No	-

Timing Parameter Details

The timing parameter has two modes:

“Absolute seconds”: When selected, a seconds sub-parameter appears. This specifies the time in seconds from the start of the input video where the image applies (default: 0.0, range: 0.0 to 30.0, step 0.1).
“Fraction of duration”: When selected, a fraction sub-parameter appears. This specifies where in the input video the image applies as a fraction of its duration, where 0.0 is the start and 1.0 is the end (default: 0.0, range: 0.0 to 1.0, step 0.01).

Outputs

Output Name	Description	Data Type
`keyframes`	A chain of keyframes including this one and any previously connected keyframes.	KEYFRAME

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​Inputs

​Timing Parameter Details

​Outputs

Inputs

Timing Parameter Details

Outputs