# Bytedance

> Image to Video endpoint for Seedance 1.0 Pro Fast, a next-generation video model designed to deliver maximum performance at minimal cost


## Overview

- **Endpoint**: `https://fal.run/fal-ai/bytedance/seedance/v1/pro/fast/image-to-video`
- **Model ID**: `fal-ai/bytedance/seedance/v1/pro/fast/image-to-video`
- **Category**: image-to-video
- **Kind**: inference
**Tags**: bytedance, seedance, pro, fast



## Pricing

Each 1080p 5 second video costs roughly **$0.243**. For other resolutions, 1 million video tokens costs **$1.0**. tokens(video)  = (height x width x FPS x duration) / 1024. 

For more details, see [fal.ai pricing](https://fal.ai/pricing).

## API Information

This model can be used via our HTTP API or more conveniently via our client libraries.
See the input and output schema below, as well as the usage examples.


### Input Schema

The API accepts the following input parameters:


- **`prompt`** (`string`, _required_):
  The text prompt used to generate the video
  - Examples: "Bathed in a stark spotlight, a lone ballet dancer takes center stage. Her movements, precise and graceful, tell a story of passion and dedication against the velvet darkness. The scene evokes a sense of intimacy, highlighting the raw emotion and artistry of her performance."

- **`aspect_ratio`** (`AspectRatioEnum`, _optional_):
  The aspect ratio of the generated video Default value: `"auto"`
  - Default: `"auto"`
  - Options: `"21:9"`, `"16:9"`, `"4:3"`, `"1:1"`, `"3:4"`, `"9:16"`, `"auto"`

- **`resolution`** (`ResolutionEnum`, _optional_):
  Video resolution - 480p for faster generation, 720p for balance, 1080p for higher quality Default value: `"1080p"`
  - Default: `"1080p"`
  - Options: `"480p"`, `"720p"`, `"1080p"`

- **`duration`** (`DurationEnum`, _optional_):
  Duration of the video in seconds Default value: `"5"`
  - Default: `"5"`
  - Options: `"2"`, `"3"`, `"4"`, `"5"`, `"6"`, `"7"`, `"8"`, `"9"`, `"10"`, `"11"`, `"12"`

- **`camera_fixed`** (`boolean`, _optional_):
  Whether to fix the camera position
  - Default: `false`

- **`seed`** (`integer`, _optional_):
  Random seed to control video generation. Use -1 for random.

- **`enable_safety_checker`** (`boolean`, _optional_):
  If set to true, the safety checker will be enabled. Default value: `true`
  - Default: `true`
  - Examples: true

- **`num_frames`** (`integer`, _optional_):
  The number of frames to generate. If provided, will override duration.
  - Range: `29` to `289`

- **`image_url`** (`string`, _required_):
  The URL of the image used to generate video
  - Examples: "https://storage.googleapis.com/falserverless/example_inputs/seedance_fast_i2v_input.png"



**Required Parameters Example**:

```json
{
  "prompt": "Bathed in a stark spotlight, a lone ballet dancer takes center stage. Her movements, precise and graceful, tell a story of passion and dedication against the velvet darkness. The scene evokes a sense of intimacy, highlighting the raw emotion and artistry of her performance.",
  "image_url": "https://storage.googleapis.com/falserverless/example_inputs/seedance_fast_i2v_input.png"
}
```

**Full Example**:

```json
{
  "prompt": "Bathed in a stark spotlight, a lone ballet dancer takes center stage. Her movements, precise and graceful, tell a story of passion and dedication against the velvet darkness. The scene evokes a sense of intimacy, highlighting the raw emotion and artistry of her performance.",
  "aspect_ratio": "auto",
  "resolution": "1080p",
  "duration": "5",
  "enable_safety_checker": true,
  "image_url": "https://storage.googleapis.com/falserverless/example_inputs/seedance_fast_i2v_input.png"
}
```


### Output Schema

The API returns the following output format:

- **`video`** (`File`, _required_):
  Generated video file
  - Examples: {"url":"https://storage.googleapis.com/falserverless/example_inputs/seedance_fast_i2v_output.mp4"}

- **`seed`** (`integer`, _required_):
  Seed used for generation
  - Examples: 42



**Example Response**:

```json
{
  "video": {
    "url": "https://storage.googleapis.com/falserverless/example_inputs/seedance_fast_i2v_output.mp4"
  },
  "seed": 42
}
```


## Usage Examples

### cURL

```bash
curl --request POST \
  --url https://fal.run/fal-ai/bytedance/seedance/v1/pro/fast/image-to-video \
  --header "Authorization: Key $FAL_KEY" \
  --header "Content-Type: application/json" \
  --data '{
     "prompt": "Bathed in a stark spotlight, a lone ballet dancer takes center stage. Her movements, precise and graceful, tell a story of passion and dedication against the velvet darkness. The scene evokes a sense of intimacy, highlighting the raw emotion and artistry of her performance.",
     "image_url": "https://storage.googleapis.com/falserverless/example_inputs/seedance_fast_i2v_input.png"
   }'
```

### Python

Ensure you have the Python client installed:

```bash
pip install fal-client
```

Then use the API client to make requests:

```python
import fal_client

def on_queue_update(update):
    if isinstance(update, fal_client.InProgress):
        for log in update.logs:
           print(log["message"])

result = fal_client.subscribe(
    "fal-ai/bytedance/seedance/v1/pro/fast/image-to-video",
    arguments={
        "prompt": "Bathed in a stark spotlight, a lone ballet dancer takes center stage. Her movements, precise and graceful, tell a story of passion and dedication against the velvet darkness. The scene evokes a sense of intimacy, highlighting the raw emotion and artistry of her performance.",
        "image_url": "https://storage.googleapis.com/falserverless/example_inputs/seedance_fast_i2v_input.png"
    },
    with_logs=True,
    on_queue_update=on_queue_update,
)
print(result)
```

### JavaScript

Ensure you have the JavaScript client installed:

```bash
npm install --save @fal-ai/client
```

Then use the API client to make requests:

```javascript
import { fal } from "@fal-ai/client";

const result = await fal.subscribe("fal-ai/bytedance/seedance/v1/pro/fast/image-to-video", {
  input: {
    prompt: "Bathed in a stark spotlight, a lone ballet dancer takes center stage. Her movements, precise and graceful, tell a story of passion and dedication against the velvet darkness. The scene evokes a sense of intimacy, highlighting the raw emotion and artistry of her performance.",
    image_url: "https://storage.googleapis.com/falserverless/example_inputs/seedance_fast_i2v_input.png"
  },
  logs: true,
  onQueueUpdate: (update) => {
    if (update.status === "IN_PROGRESS") {
      update.logs.map((log) => log.message).forEach(console.log);
    }
  },
});
console.log(result.data);
console.log(result.requestId);
```


## Additional Resources

### Documentation

- [Model Playground](https://fal.ai/models/fal-ai/bytedance/seedance/v1/pro/fast/image-to-video)
- [API Documentation](https://fal.ai/models/fal-ai/bytedance/seedance/v1/pro/fast/image-to-video/api)
- [OpenAPI Schema](https://fal.ai/api/openapi/queue/openapi.json?endpoint_id=fal-ai/bytedance/seedance/v1/pro/fast/image-to-video)

### fal.ai Platform

- [Platform Documentation](https://docs.fal.ai)
- [Python Client](https://docs.fal.ai/clients/python)
- [JavaScript Client](https://docs.fal.ai/clients/javascript)