RunwayFirstLastFrameNode - ComfyUI Built-in Node Documentation

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	Description	Data Type	Required	Range
`prompt`	Text prompt for the generation (default: empty string)	STRING	Yes	N/A
`start_frame`	Start frame to be used for the video	IMAGE	Yes	N/A
`end_frame`	End frame to be used for the video. Supported for gen3a_turbo only.	IMAGE	Yes	N/A
`duration`	Video duration in seconds (default: “5”)	COMBO	Yes	`"5"` `"10"`
`ratio`	Aspect ratio for the generated video (default: “768:1280”)	COMBO	Yes	`"768:1280"` `"1280:768"`
`seed`	Random seed for generation. Set to 0 for random seed (default: 0).	INT	No	0 to 4294967295

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

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​Inputs

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Inputs

Outputs