RunwayFirstLastFrameNode - ComfyUI Built-in Node Documentation

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

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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	"5" "10"	Video duration in seconds (default: “5”)
ratio	COMBO	Yes	"768:1280" "1280:768"	Aspect ratio for the generated video (default: “768:1280”)
seed	INT	No	0 to 4294967295	Random seed for generation. Set to 0 for random seed (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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