# Decart

> Lucy-5B is a model that can create 5-second I2V videos in under 5 seconds, achieving >1x RTF end-to-end


## Overview

- **Endpoint**: `https://fal.run/fal-ai/decart/lucy-5b/image-to-video`
- **Model ID**: `fal-ai/decart/lucy-5b/image-to-video`
- **Category**: image-to-video
- **Kind**: inference


## Pricing

- **Price**: $0.15 per videos

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_):
  Text description of the desired video content
  - Examples: "A cat is walking slowly in the garden"

- **`image_url`** (`string`, _required_):
  URL of the image to use as the first frame
  - Examples: "https://v3.fal.media/files/monkey/OlpQEYh7oNeJ3qKsdiaym_ia5ECOgFbfcniMDu01_18_da73e078e0924472b51d92f3e3fba98c.png"

- **`resolution`** (`string`, _optional_):
  Resolution of the generated video Default value: `"720p"`
  - Default: `"720p"`

- **`aspect_ratio`** (`AspectRatioEnum`, _optional_):
  Aspect ratio of the generated video. Default value: `"16:9"`
  - Default: `"16:9"`
  - Options: `"9:16"`, `"16:9"`

- **`sync_mode`** (`boolean`, _optional_):
  If `True`, the media will be returned as a data URI and the output data won't be available in the request history. Default value: `true`
  - Default: `true`



**Required Parameters Example**:

```json
{
  "prompt": "A cat is walking slowly in the garden",
  "image_url": "https://v3.fal.media/files/monkey/OlpQEYh7oNeJ3qKsdiaym_ia5ECOgFbfcniMDu01_18_da73e078e0924472b51d92f3e3fba98c.png"
}
```

**Full Example**:

```json
{
  "prompt": "A cat is walking slowly in the garden",
  "image_url": "https://v3.fal.media/files/monkey/OlpQEYh7oNeJ3qKsdiaym_ia5ECOgFbfcniMDu01_18_da73e078e0924472b51d92f3e3fba98c.png",
  "resolution": "720p",
  "aspect_ratio": "16:9",
  "sync_mode": true
}
```


### Output Schema

The API returns the following output format:

- **`video`** (`File`, _required_):
  The generated MP4 video with H.264 encoding
  - Examples: {"url":"https://v3.fal.media/files/kangaroo/rIFaCsyWvBxYBKw3cPbOU_indir.mp4"}



**Example Response**:

```json
{
  "video": {
    "url": "https://v3.fal.media/files/kangaroo/rIFaCsyWvBxYBKw3cPbOU_indir.mp4"
  }
}
```


## Usage Examples

### cURL

```bash
curl --request POST \
  --url https://fal.run/fal-ai/decart/lucy-5b/image-to-video \
  --header "Authorization: Key $FAL_KEY" \
  --header "Content-Type: application/json" \
  --data '{
     "prompt": "A cat is walking slowly in the garden",
     "image_url": "https://v3.fal.media/files/monkey/OlpQEYh7oNeJ3qKsdiaym_ia5ECOgFbfcniMDu01_18_da73e078e0924472b51d92f3e3fba98c.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/decart/lucy-5b/image-to-video",
    arguments={
        "prompt": "A cat is walking slowly in the garden",
        "image_url": "https://v3.fal.media/files/monkey/OlpQEYh7oNeJ3qKsdiaym_ia5ECOgFbfcniMDu01_18_da73e078e0924472b51d92f3e3fba98c.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/decart/lucy-5b/image-to-video", {
  input: {
    prompt: "A cat is walking slowly in the garden",
    image_url: "https://v3.fal.media/files/monkey/OlpQEYh7oNeJ3qKsdiaym_ia5ECOgFbfcniMDu01_18_da73e078e0924472b51d92f3e3fba98c.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/decart/lucy-5b/image-to-video)
- [API Documentation](https://fal.ai/models/fal-ai/decart/lucy-5b/image-to-video/api)
- [OpenAPI Schema](https://fal.ai/api/openapi/queue/openapi.json?endpoint_id=fal-ai/decart/lucy-5b/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)