KlingStartEndFrameNode - ComfyUI Built-in Node Documentation

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Kling Start-End Frame to Video node creates a video sequence that transitions between your provided start and end images. It generates all the frames in between to produce a smooth transformation from the first frame to the last frame. This node calls the image-to-video API but only supports the input options that work with the image_tail request field.

Inputs

Parameter	Data Type	Required	Range	Description
`start_frame`	IMAGE	Yes	-	Reference Image - URL or Base64 encoded string, cannot exceed 10MB, resolution not less than 300*300px, aspect ratio between 1:2.5 ~ 2.5:1. Base64 should not include data:image prefix.
`end_frame`	IMAGE	Yes	-	Reference Image - End frame control. URL or Base64 encoded string, cannot exceed 10MB, resolution not less than 300*300px. Base64 should not include data:image prefix.
`prompt`	STRING	Yes	-	Positive text prompt
`negative_prompt`	STRING	Yes	-	Negative text prompt
`cfg_scale`	FLOAT	No	0.0-1.0	Controls the strength of the prompt guidance (default: 0.5)
`aspect_ratio`	COMBO	No	”16:9" "9:16" "1:1" "21:9" "9:21" "3:4" "4:3”	The aspect ratio for the generated video (default: “16:9”)
`mode`	COMBO	No	Multiple options available	The configuration to use for the video generation following the format: mode / duration / model_name. (default: third option from available modes)

Image Constraints:

Both start_frame and end_frame must be provided and cannot exceed 10MB file size
Minimum resolution: 300×300 pixels for both images
start_frame aspect ratio must be between 1:2.5 and 2.5:1
Base64 encoded images should not include the “data:image” prefix

Outputs

Output Name	Data Type	Description
`output`	VIDEO	The generated video sequence
`video_id`	STRING	Unique identifier for the generated video
`duration`	STRING	Duration of the generated video

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Inputs

Outputs