RunwayFirstLastFrameNode - ComfyUI Built-in Node Documentation - ComfyUI

The Runway First-Last-Frame to Video node generates a video using a start frame, an end frame, and a text prompt. It creates a smooth transition between the two provided keyframes using Runway’s gen3a_turbo model. It is especially useful for complex transitions where the end frame is completely different 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`	Duration of the generated video in seconds. The longer 10s duration gives the generation more time to smoothly transition between the start and end frames (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 a 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

Notes:

The generation cost is based on the selected duration: USD 0.0715 per second (USD 0.3575 for 5 seconds, USD 0.715 for 10 seconds)
This node is marked as deprecated

Outputs

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

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