KlingStartEndFrameNode - ComfyUI Built-in Node Documentation

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	Description	Data Type	Required	Range
`start_frame`	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.	IMAGE	Yes	-
`end_frame`	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.	IMAGE	Yes	-
`prompt`	Positive text prompt	STRING	Yes	-
`negative_prompt`	Negative text prompt	STRING	Yes	-
`cfg_scale`	Controls the strength of the prompt guidance (default: 0.5)	FLOAT	No	0.0-1.0
`aspect_ratio`	The aspect ratio for the generated video (default: “16:9”)	COMBO	No	”16:9" "9:16" "1:1”
`mode`	The configuration to use for the video generation following the format: mode / duration / model_name. (default: “pro mode / 5s duration / kling-v2-5-turbo”)	COMBO	No	”pro mode / 5s duration / kling-v1-5" "pro mode / 10s duration / kling-v1-5" "pro mode / 5s duration / kling-v1-6" "pro mode / 10s duration / kling-v1-6" "pro mode / 5s duration / kling-v2-1" "pro mode / 10s duration / kling-v2-1" "pro mode / 5s duration / kling-v2-5-turbo" "pro mode / 10s duration / kling-v2-5-turbo”

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

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Inputs

Outputs