RunwayFirstLastFrameNode - ComfyUI Built-in Node Documentation

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The Runway First-Last-Frame to Video node generates videos by uploading first and last keyframes along with a text prompt. It creates smooth transitions between the provided start and end frames using Runway’s Gen-3 model. This is particularly useful for complex transitions where the end frame differs significantly from the start frame.

Inputs

Parameter	Data Type	Required	Range	Description
`prompt`	STRING	Yes	N/A	Text prompt for the generation (default: empty string)
`start_frame`	IMAGE	Yes	N/A	Start frame to be used for the video
`end_frame`	IMAGE	Yes	N/A	End frame to be used for the video. Supported for gen3a_turbo only.
`duration`	COMBO	Yes	Multiple options available	Video duration selection from available Duration options
`ratio`	COMBO	Yes	Multiple options available	Aspect ratio selection from available RunwayGen3aAspectRatio options
`seed`	INT	No	0-4294967295	Random seed for generation (default: 0)

Parameter Constraints:

The prompt must contain at least 1 character
Both start_frame and end_frame must have maximum dimensions of 7999x7999 pixels
Both start_frame and end_frame must have aspect ratios between 0.5 and 2.0
The end_frame parameter is only supported when using the gen3a_turbo model

Outputs

Output Name	Data Type	Description
`output`	VIDEO	The generated video transitioning between the start and end frames

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Inputs

Outputs