workflow-templates-broken-zap-2026-06-08/site/knowledge/nodes/api/RunwayFirstLastFrameNode.md

RunwayFirstLastFrameNode

Category: api node/video/Runway

Display Name: Runway First-Last-Frame to Video

Description

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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

Source: comfy_api_nodes/nodes_runway.py

Used in 1 template(s)