Kling 2.1 Image to Video

curl --request POST \
  --url https://api.vidgo.ai/api/generate/submit \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "kwaivgi/kling-video/v2.1/standard/image-to-video",
  "input": {
    "prompt": "A quiet forest under soft morning light, with natural detail.",
    "start_image_url": "https://example.com/image.png",
    "duration": 5
  }
}
'

{
  "code": 200,
  "data": {
    "task_id": "task-unified-example",
    "status": "running",
    "created_time": "2026-09-10T08:00:00"
  }
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

Request timeout

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

Kling 2.1 Standard image-to-video with a required start frame.

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Models

• kwaivgi/kling-video/v2.1/standard/image-to-video - Generate video from image input.

​

Features

• Generate video from image input.
• Use start_image_url to supply the starting frame.
• For an optional ending frame, use the Pro endpoint.

​

Duration Options

• 5, 10 seconds - Set duration as an integer. Optional. Default: 5 seconds when omitted. Strings, booleans, null and fractional values are rejected.

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Advanced Parameters

Set model and optional callback_url at the request root. Place all workflow parameters, including output options, inside input. Send only the input fields supported by this workflow. Unsupported input fields are rejected before credits are deducted. Input URLs must use HTTP(S), include a hostname, and contain no embedded credentials.

​

Prompt

• prompt: Required. Describe the scene and desired motion. Length: 1-5,000 characters.
• The value must be a string and must not be blank after trimming. Non-string values are rejected.

​

Start Image URL

• start_image_url: Required. Provide the starting frame URL. Use a publicly accessible HTTP(S) URL without credentials or whitespace. Empty URLs and null are rejected.

​

Negative Prompt

• negative_prompt: Optional. Describe content to avoid.

​

Billing Factors

Billed per video according to the selected model tier (Standard or Pro) and video duration (duration). Credits are deducted on submission and refunded if the task fails.