> ## 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.

# Vidu Q1 Start-End Frames

Vidu Q1 Start-End Frames generates dynamic videos from a start frame and an end frame, incorporating creative storytelling and animation effects.

<Tip>
  This is an **async** API that only returns the task\_id of the async task. You should 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="images" type="string[]" required={true}>
  Two images: the first is the start frame, the second is the end frame.

  Notes:

  1. Supports public URLs or Base64 format
  2. Aspect ratios must be similar: the ratio of the start frame to the end frame must be between 0.8 and 1.25
  3. Supported formats: png, jpeg, jpg, webp
  4. Maximum size: 50MB
  5. Base64 decoded length must be less than 10MB and must include the appropriate content type string. Example:

  ```
  data:image/png;base64,{base64_encode}
  ```
</ParamField>

<ParamField body="prompt" type="string" required={false}>
  Prompt description, maximum 1500 characters.
</ParamField>

<ParamField body="duration" type="integer" required={false}>
  Video duration in seconds. Default: 5 seconds, currently only the `5` second option is supported.
</ParamField>

<ParamField body="seed" type="integer" required={false}>
  Random seed for video generation.

  * Default: random seed value
  * Manually set values will override the default random seed
</ParamField>

<ParamField body="resolution" type="string" required={false}>
  Output video resolution. Default: 1080p, currently only the `1080p` option is supported.
</ParamField>

<ParamField body="movement_amplitude" type="string" required={false}>
  Movement amplitude of objects in the frame. Default: `auto`<br />
  Possible values: `auto`, `small`, `medium`, `large`
</ParamField>

<ParamField body="bgm" type="boolean" required={false}>
  Whether to add background music to the generated video. Default: `false`<br />
  Possible values: `true`, `false`

  When set to true, the system will automatically add suitable BGM. BGM has no duration limit; the system will automatically adapt to the video length.
</ParamField>

## Response

<ResponseField name="task_id" type="string" required={true}>
  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.
</ResponseField>