> ## Documentation Index
> Fetch the complete documentation index at: https://docs.myrouter.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Kling-o1 Image to Video

Kling Omni Video O1 image-to-video leverages MVL (Multimodal Vision Language) technology to transform static images into cinematic videos. It maintains subject consistency while adding natural motion, physics simulation, and smooth scene dynamics.

<Tip>
  This is an **async** API that only returns the task\_id of the async task. Use the task\_id to call the [Get Async Task Result API](/docs/models/reference-get-async-task-result) to retrieve the generated result.
</Tip>

## Request Headers

<ParamField header="Content-Type" type="string" required={true}>
  Enum: `application/json`
</ParamField>

<ParamField header="Authorization" type="string" required={true}>
  Bearer authentication format: Bearer \{\{API Key}}.
</ParamField>

## Request Body

<ParamField body="image" type="string" required={true}>
  First frame reference image. Supports Base64-encoded image or image URL. Supported formats: jpg/jpeg/png. File size must not exceed 10MB. Width and height must be at least 300px. Aspect ratio must be between 1:2.5 and 2.5:1.
</ParamField>

<ParamField body="prompt" type="string" required={true}>
  Positive prompt for video generation. Maximum 2500 characters.

  Length limit: 0 - 2500
</ParamField>

<ParamField body="duration" type="integer" default={5}>
  Duration of the generated video in seconds. Supports 5 and 10 seconds.

  Possible values: `5`, `10`
</ParamField>

<ParamField body="last_image" type="string">
  Last frame reference image. Supports Base64-encoded image or image URL. When setting the last frame, the first frame (image) must also be set. Supported formats: jpg/jpeg/png. File size must not exceed 10MB. Width and height must be at least 300px. Aspect ratio must be between 1:2.5 and 2.5:1.
</ParamField>

<ParamField body="aspect_ratio" type="string" default="16:9">
  Aspect ratio of the generated video. Required when no first frame reference image is used.

  Possible values: `16:9`, `9:16`, `1:1`
</ParamField>

## Response

<ResponseField name="task_id" type="string" required={true}>
  Use the task\_id to call the [Get Async Task Result API](/docs/models/reference-get-async-task-result) to retrieve the generated output.
</ResponseField>