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

# Seedance 1.0 Pro Fast

> Seedance 1.0 Pro Fast: text and image-to-video model. Request examples and parameters for MixRoute.

Seedance 1.0 Pro Fast is a text and image-to-video model from ByteDance.

Call `seedance-1-0-pro-fast-251015` through MixRoute using the endpoint shown below.

## Key capabilities

* Text-to-video - Generate a video from a text prompt
* Image-to-video - Use an image as a first frame or reference
* Asynchronous workflow - Submit a task, then poll for the result

## Output specifications

| Property           | Value                                     |
| ------------------ | ----------------------------------------- |
| Resolution         | 480p, 720p, 1080p                         |
| Aspect ratio       | 21:9, 16:9, 4:3, 1:1, 3:4, 9:16, adaptive |
| Duration           | 2-12 s                                    |
| Synchronized audio | Not generated                             |
| Format             | mp4                                       |
| Frame rate         | 24 fps                                    |

## Workflow

```text theme={null}
1. POST /v1/video/generations -> task_id
2. GET /v1/video/generations/{task_id} -> status
3. When the task succeeds -> read the video URL
```

## Examples

### Text-to-video

<Tabs>
  <Tab title="cURL">
    ```bash theme={null}
    curl "https://api.mixroute.ai/v1/video/generations" \
      -H "Authorization: Bearer YOUR_API_KEY" \
      -H "Content-Type: application/json" \
      -d '{
      "model": "seedance-1-0-pro-fast-251015",
      "prompt": "A red square gently pulses on a clean white background",
      "asset": false,
      "metadata": {
        "duration": 4,
        "resolution": "480p",
        "ratio": "1:1",
        "watermark": false,
        "generate_audio": false
      }
    }'
    ```
  </Tab>

  <Tab title="Python">
    ```python theme={null}
    import requests

    response = requests.post(
        "https://api.mixroute.ai/v1/video/generations",
        headers={"Authorization": "Bearer YOUR_API_KEY"},
        json={'model': 'seedance-1-0-pro-fast-251015',
              'prompt': 'A red square gently pulses on a clean white background',
              'asset': False,
              'metadata': {'duration': 4,
                           'resolution': '480p',
                           'ratio': '1:1',
                           'watermark': False,
                           'generate_audio': False}},
    )

    print(response.json())
    ```
  </Tab>
</Tabs>

### Image-to-video

```bash theme={null}
curl "https://api.mixroute.ai/v1/video/generations" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "seedance-1-0-pro-fast-251015",
  "prompt": "The subject turns toward the camera with a gentle motion",
  "asset": true,
  "metadata": {
    "duration": 4,
    "resolution": "480p",
    "ratio": "1:1",
    "watermark": false,
    "generate_audio": false,
    "content": [
      {
        "type": "text",
        "text": "The subject turns toward the camera with a gentle motion"
      },
      {
        "type": "image_url",
        "image_url": {
          "url": "https://example.com/first-frame.png"
        },
        "role": "first_frame"
      }
    ]
  }
}'
```

## Parameters

| Parameter                 | Type    | Required | Description                                                                                           |
| ------------------------- | ------- | -------- | ----------------------------------------------------------------------------------------------------- |
| `model`                   | string  | Yes      | Must be `seedance-1-0-pro-fast-251015`.                                                               |
| `prompt`                  | string  | Yes      | Video generation instruction.                                                                         |
| `asset`                   | boolean | Yes      | Set true when metadata.content includes image, video, or audio references; false for text-only input. |
| `metadata`                | object  | Yes      | Contains all Seedance generation controls and reference content.                                      |
| `metadata.content`        | array   | No       | Text, image\_url, video\_url, and audio\_url content items.                                           |
| `metadata.duration`       | integer | No       | Video duration in seconds.                                                                            |
| `metadata.resolution`     | string  | No       | Output resolution.                                                                                    |
| `metadata.ratio`          | string  | No       | Output aspect ratio.                                                                                  |
| `metadata.generate_audio` | boolean | No       | Generate synchronized audio when the model supports it.                                               |
| `metadata.watermark`      | boolean | No       | Add an AI-generated watermark.                                                                        |
| `metadata.content[].role` | string  | No       | first\_frame, last\_frame, reference\_image, reference\_video, or reference\_audio.                   |

### Input modes

| Mode           | Inputs            |
| -------------- | ----------------- |
| Text-to-video  | text              |
| Image-to-video | text + image\_url |