# Seedance 1.5 Pro API

Complete API reference for Seedance 1.5 Pro video generation models.

## Model Variants

This API supports two model variants:

| Model | ID | Description |
|-------|-----|-------------|
| **Seedance 1.5 Pro Text to Video** | `seedance-v1.5-pro-text-to-video` | High-quality text-to-video generation |
| **Seedance 1.5 Pro Image to Video** | `seedance-v1.5-pro-image-to-video` | Image animation with motion control |

## Quick Comparison

| Feature | Text to Video | Image to Video |
|---------|---------------|----------------|
| Input | Text prompt | Image + Text prompt |
| Duration Range | 4-12 seconds | 4-12 seconds |
| Resolution Options | 480p, 720p, 1080p | 480p, 720p, 1080p |
| Start Frame | Not supported | Required |
| End Frame | Not supported | Not supported |
| Audio Support | Optional | Optional |
| Audio URL | Not supported | Not supported |

### Supported Aspect Ratios

`21:9`, `16:9`, `9:16`, `1:1`, `4:3`, `3:4`

### Resolution Options

| Resolution | Description |
|------------|-------------|
| `480p` | Standard definition, faster processing |
| `720p` | High definition, balanced quality and speed |
| `1080p` | Full HD, highest quality output |

## Seedance 1.5 Pro Text to Video

### Endpoint

```
POST /api/v1/video/task
```

### Request Parameters

#### Required

| Parameter | Type | Description |
|-----------|------|-------------|
| `model_name` | string | Must be `"seedance-v1.5-pro-text-to-video"` |
| `prompt` | string | Video generation prompt |
| `duration` | number | Video duration in seconds (4-12) |
| `resolution` | string | Output resolution: `"480p"`, `"720p"`, or `"1080p"` |
| `aspect_ratio` | string | Video aspect ratio: `"21:9"`, `"16:9"`, `"9:16"`, `"1:1"`, `"4:3"`, or `"3:4"` |

#### Optional

| Parameter | Type | Description |
|-----------|------|-------------|
| `sound` | boolean | Generate ambient sound for the video |
| `camera_fixed` | boolean | Lock camera position, disabling camera movement |
| `seed` | number | Random seed for reproducible generation |

### Example Request

```javascript
const response = await fetch('https://api.flaq.ai/api/v1/video/task', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    model_name: 'seedance-v1.5-pro-text-to-video',
    prompt: 'A golden retriever running through a sunlit meadow',
    duration: 6,
    resolution: '1080p',
    aspect_ratio: '16:9'
  })
});

const { data } = await response.json();
const taskId = data.task_id;
```

**Body-only example with optional parameters:**

```javascript
{
  model_name: 'seedance-v1.5-pro-text-to-video',
  prompt: 'A golden retriever running through a sunlit meadow',
  duration: 6,
  resolution: '1080p',
  aspect_ratio: '16:9',
  sound: true,
  camera_fixed: false,
  seed: 42
}
```

## Seedance 1.5 Pro Image to Video

### Request Parameters

#### Required

| Parameter | Type | Description |
|-----------|------|-------------|
| `model_name` | string | Must be `"seedance-v1.5-pro-image-to-video"` |
| `prompt` | string | Video generation prompt |
| `duration` | number | Video duration in seconds (4-12) |
| `resolution` | string | Output resolution: `"480p"`, `"720p"`, or `"1080p"` |
| `aspect_ratio` | string | Video aspect ratio: `"21:9"`, `"16:9"`, `"9:16"`, `"1:1"`, `"4:3"`, or `"3:4"` |
| `image_url` | string | The first frame of the video |

#### Optional

| Parameter | Type | Description |
|-----------|------|-------------|
| `sound` | boolean | Generate ambient sound for the video |
| `camera_fixed` | boolean | Lock camera position, disabling camera movement |
| `seed` | number | Random seed for reproducible generation |

### Example Request

```javascript
const response = await fetch('https://api.flaq.ai/api/v1/video/task', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    model_name: 'seedance-v1.5-pro-image-to-video',
    image_url: 'https://example.com/image.jpg',
    prompt: 'Camera slowly pulls back to reveal the full landscape',
    duration: 6,
    resolution: '1080p',
    aspect_ratio: '16:9'
  })
});

const { data } = await response.json();
const taskId = data.task_id;
```

**Body-only example:**

```javascript
{
  model_name: 'seedance-v1.5-pro-image-to-video',
  image_url: 'https://example.com/image.jpg',
  prompt: 'Camera slowly pulls back to reveal the full landscape',
  duration: 6,
  resolution: '1080p',
  aspect_ratio: '16:9',
  sound: true
}
```

## Response Format

### Initial Response

Both models return a `task_id` for polling:

```json
{
  "code": 0,
  "message": "success",
  "data": {
    "task_id": "{task_id}",
    "response_url": "https://api.flaq.ai/api/v1/video/{task_id}",
    "task_status": "submitted"
  }
}
```

### Polling Response

Poll `GET /api/v1/video/{taskId}` to check status:

```json
{
  "code": 0,
  "message": "success",
  "data": {
    "task_id": "{task_id}",
    "response_url": "https://api.flaq.ai/api/v1/video/{task_id}",
    "task_status": "succeed",
    "task_status_msg": null,
    "task_result": {
      "credit": 0.2,
      "videos": [
        {
          "url": "https://example.com/generated-video.mp4"
        }
      ]
    }
  }
}
```

### Status Values

- `submitted`: Task accepted and waiting to be processed
- `processing`: Video generation in progress
- `succeed`: Video generation completed
- `failed`: Video generation failed

## Processing Time

Typical processing time: 2-5 minutes depending on duration and resolution.

Longer videos at 1080p may take up to 8 minutes. Poll every 5-10 seconds to check status.

## Best Practices

1. **Describe Motion Clearly**: Include specific movement descriptions in prompts for more predictable results
2. **Resolution Selection**: Use `480p` or `720p` for faster iteration, `1080p` for final output
3. **Camera Control**: Set `camera_fixed: true` when you want the subject to be the focus without camera drift
4. **Aspect Ratio**: Match the aspect ratio to your target platform (e.g., `9:16` for mobile, `16:9` for desktop)
5. **Reproducibility**: Use the `seed` parameter to reproduce or iterate on a specific generation
6. **Image Quality**: For image-to-video, use high-resolution, well-lit input images for best results