RunwayImageToVideoNodeGen3a - ComfyUI Built-in Node Documentation

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The Runway Image to Video (Gen3a Turbo) node generates a video from a single starting frame using Runway’s Gen3a Turbo model. It takes a text prompt and an initial image frame, then creates a video sequence based on the specified duration and aspect ratio. This node connects to Runway’s API to process the generation remotely.

Inputs

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

Parameter Constraints:

The start_frame must have dimensions not exceeding 7999x7999 pixels
The start_frame must have an aspect ratio between 0.5 and 2.0
The prompt must contain at least one character (cannot be empty)

Outputs

Output Name	Data Type	Description
`output`	VIDEO	The generated video sequence

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Inputs

Outputs