RunwayImageToVideoNodeGen3a - ComfyUI Built-in Node Documentation

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

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	Description	Data Type
`output`	The generated video sequence	VIDEO

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​Inputs

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Inputs

Outputs