# Vidu Q4 Reference to Video API

> Reference-to-video Q4 b’sa 12-il immaġni u 3 klipps tal-vuċi, 3-16-il sekonda, sa 4K

Iżomm il-karattri, l-oġġetti u l-vuċijiet konsistenti billi juża sa 12-il `reference_image_urls` u sa 3 klipps mp3 f’`reference_audio_urls` (3-12-il sekonda kull wieħed). Il-prompt, sa 5000 karattru, jirreferi għar-referenzi skont il-pożizzjoni. `duration` hija 3-16-il sekonda, `resolution` sa 4K, u `audio` huwa mitfi b’mod awtomatiku.

- Model id: `vidu/q4/reference-to-video`
- Made by: Vidu
- Category: Reference to Video
- Output: video
- Price per second of your output video: from $0.0315 / second of output video (cheapest run $0.032 (32 API credits))
- Run: `POST https://api.doitong.com/v1/run/vidu/q4/reference-to-video`
- Quote: `POST https://api.doitong.com/v1/quote/vidu/q4/reference-to-video`
- Docs page: https://doitong.com/mt/developers/models/vidu/q4/reference-to-video

## Pricing

Price: **from $0.0315 / second of output video** (the lowest tier; the quote prices your exact input). Price per second of your output video: the input files are measured before the run (length, resolution, frame rate). The quote measures the same files and is exactly what the run charges.

Price by tier:

- 540p: $0.0315 / second of output video
- 720p: $0.0665 / second of output video
- 1080p: $0.084 / second of output video
- 2K: $0.133 / second of output video
- 4K: $0.273 / second of output video

The full example input below costs $0.333 = 333 API credits (5 s output video × $0.0665 (720p)).

Prices are the upstream price in USD, paid from the API balance in API credits (1000 API credits = 1 USD). `POST https://api.doitong.com/v1/quote/vidu/q4/reference-to-video` with the same JSON body returns the exact price for that input; the quote is exactly what a run charges. Invalid input is never charged and failed or canceled requests are refunded automatically.

## Input parameters

Send either the canonical name or the native field name (not both). Canonical names are the same across models.

| Parameter | Canonical name | Type | Required | Default | Allowed values / range | Description |
|---|---|---|---|---|---|---|
| `prompt` |  | string | yes |  | 1 – 5000 characters | Prompt tal-ġenerazzjoni tal-vidjo b'limitu ta' 5000 karattru. Irreferi għall-immaġnijiet bil-pożizzjonijiet tagħhom fil-lista, bħal [@reference_image_1] u [@reference_image_2]; għall-klipps tal-awdjo, uża [reference_audio_1] u [reference_audio_2], u kompli n-numerazzjoni għall-entrati ta' wara. |
| `reference_image_urls` | `images` | array of image URL | no |  |  | Immaġnijiet ta' referenza biex tinżamm il-konsistenza tas-suġġett, ipprovduti bħala URLs jew URIs tad-dejta base64. Jaċċetta sa 12-il immaġni f'format png, jpeg, jpg jew webp. |
| `reference_audio_urls` |  | array of audio URL | no |  |  | Awdjo ta' referenza biex tinżamm il-konsistenza tal-vuċi, ipprovdut bħala URLs jew URIs tad-dejta base64. Jaċċetta sa 3 klipps mp3, kull wieħed idum 3–12-il sekonda b'daqs massimu ta' 50 MB. |
| `duration` |  | integer | no | `5` | 3 – 16 | Tul tal-vidjo f'sekondi, minn 3 sa 16. |
| `seed` |  | integer \| null | no |  |  | Seed li jagħmel il-ġenerazzjoni riproduċibbli. L-issettjar tiegħu għal None jagħżel seed b’mod każwali. |
| `aspect_ratio` |  | enum (string) | no | `16:9` | `16:9`, `9:16`, `4:3`, `3:4`, `1:1` | Proporzjon tal-aspett tal-vidjo tal-output. |
| `resolution` |  | enum (string) | no | `720p` | `540p`, `720p`, `1080p`, `2K`, `4K` | Riżoluzzjoni tal-vidjo li jirriżulta. |
| `audio` |  | boolean | no | `false` |  | Għażla tal-soundtrack tal-vidjo: false iżżomm ir-riżultat sieket; l-attivazzjoni tiġġenera djalogu u effetti tal-ħoss flimkien mal-vidjo. |
| `enable_safety_checker` |  | boolean | no | `true` |  | L-iskrinjar jista’ jiġi rilassat billi jiġi ssettjat għal false, sakemm min jagħmel it-talba jkun awtorizzat. |

File parameters (`images`, `reference_audio_urls`) take a public `https://` URL, a `data:` URI up to 10 MB, or the `file_url` of an upload from `POST /files`.

## Example input

Required parameters only:

```json
{
  "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
}
```

A fuller example:

```json
{
  "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
}
```

## Run it

Set `DOITONG_API_KEY` to a key from https://doitong.com/developers/dashboard#keys. `?wait=20` returns the finished request in the same call when it is ready within 20 seconds; otherwise poll `GET /requests/{id}` (it also accepts `?wait=`), or pass `webhook_url`.

### curl

```bash
# Run the model; wait up to 20 s for the finished result in the same call
curl -X POST "https://api.doitong.com/v1/run/vidu/q4/reference-to-video?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
  }'

# Still "queued" or "running"? Poll with the id from the response:
curl "https://api.doitong.com/v1/requests/REQUEST_ID?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY"
```

### JavaScript

```javascript
const API = "https://api.doitong.com/v1";
const headers = {
  "Authorization": "Bearer " + process.env.DOITONG_API_KEY,
  "Content-Type": "application/json",
};

// Run the model; wait up to 20 s for the finished result in the same call
let res = await fetch(API + "/run/vidu/q4/reference-to-video?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
  }),
});
let request = await res.json();
if (!res.ok) throw new Error(request.error.code + ": " + request.error.message);

// Not finished yet: long-poll until it is
while (request.status === "queued" || request.status === "running") {
  res = await fetch(API + "/requests/" + request.id + "?wait=20", { headers });
  request = await res.json();
}
if (request.status !== "succeeded") throw new Error(JSON.stringify(request.error));
console.log(request.outputs.map((o) => o.url), request.cost.credits + " API credits ($" + request.cost.usd + ")");
```

### Python

```python
import os
import requests

API = "https://api.doitong.com/v1"
headers = {"Authorization": "Bearer " + os.environ["DOITONG_API_KEY"]}

payload = {
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
}

# Run the model; wait up to 20 s for the finished result in the same call
r = requests.post(API + "/run/vidu/q4/reference-to-video", params={"wait": 20}, json=payload, headers=headers)
request = r.json()
if not r.ok:
    raise RuntimeError(request["error"]["code"] + ": " + request["error"]["message"])

# Not finished yet: long-poll until it is
while request["status"] in ("queued", "running"):
    request = requests.get(API + "/requests/" + request["id"], params={"wait": 20}, headers=headers).json()
if request["status"] != "succeeded":
    raise RuntimeError(request["error"])
print([o["url"] for o in request["outputs"]], request["cost"]["credits"], "API credits", "$" + request["cost"]["usd"])
```

### MCP

The MCP server at `https://api.doitong.com/v1/mcp` exposes the tools `search_models`, `get_model`, `quote`, `run`, `get_request`, `cancel_request`, `list_requests`, `create_upload` and `get_account`. A `run` call for this model:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "run",
    "arguments": {
      "model_id": "vidu/q4/reference-to-video",
      "input": {
        "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
      },
      "wait_seconds": 20
    }
  }
}
```

## Response

Every call returns a request object. `status` is one of `queued`, `running`, `succeeded`, `failed`, `canceled`. `outputs` lists the generated files with URLs on our storage (kept forever, or 7 days with `?storage=temporary`; `storage` says which); `output` is the model's own result object with the same URLs.

```json
{
  "id": "req_8k2m4q7x1z9c3v5b6n0p2r4t",
  "object": "request",
  "model": "vidu/q4/reference-to-video",
  "status": "succeeded",
  "created_at": "2026-10-20T12:00:00Z",
  "started_at": "2026-10-20T12:00:02Z",
  "completed_at": "2026-10-20T12:00:09Z",
  "queue_position": null,
  "cost": {
    "credits": 333,
    "usd": "0.333",
    "charged": 333,
    "refunded": 0
  },
  "input": {
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
  },
  "output": {
    "video": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp4",
      "content_type": "video/mp4",
      "file_name": "0-output.mp4",
      "file_size": 1843200
    },
    "cover_image": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp4",
      "content_type": "video/mp4",
      "file_name": "0-output.mp4",
      "file_size": 1843200,
      "width": 1024,
      "height": 768
    },
    "seed": 42
  },
  "outputs": [
    {
      "type": "video",
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp4",
      "content_type": "video/mp4",
      "file_size": 1843200,
      "width": 1280,
      "height": 720,
      "duration": 5,
      "stored": true
    }
  ],
  "error": null,
  "metrics": {
    "inference_seconds": 6.8
  },
  "urls": {
    "self": "https://api.doitong.com/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t",
    "cancel": "https://api.doitong.com/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t/cancel"
  }
}
```

### Output fields (`output`)

| Field | Type | Description |
|---|---|---|
| `video` | object {url, content_type, file_name, file_size} | Vidjo prodott mill-mudell Q4 Preview bl-użu ta' referenzi. |
| `cover_image` | object {url, content_type, file_name, file_size, width, height} \| null | Immaġni tal-qoxra għall-vidjo li jirriżulta. |
| `seed` | integer | Seed każwali applikat matul il-ġenerazzjoni. |

## Related models

- [Vidu Q4](https://doitong.com/developers/models/vidu/q4/image-to-video.md) (`vidu/q4/image-to-video`): from $0.0315 / second
- [Seedance 2.0 Fast Reference to Video](https://doitong.com/developers/models/bytedance/seedance-2.0/fast/reference-to-video.md) (`bytedance/seedance-2.0/fast/reference-to-video`): from $0.113 / second
- [Seedance 2.0 Reference to Video](https://doitong.com/developers/models/bytedance/seedance-2.0/reference-to-video.md) (`bytedance/seedance-2.0/reference-to-video`): from $0.141 / second
- [Wan 3.0 Reference to Video](https://doitong.com/developers/models/alibaba/wan-3.0/reference-to-video.md) (`alibaba/wan-3.0/reference-to-video`): from $0.05 / second
- [Vidu Reference to Video](https://doitong.com/developers/models/vidu/reference-to-video.md) (`vidu/reference-to-video`): $0.40 / request
- [Vidu · Q1 · Reference to Video](https://doitong.com/developers/models/vidu/q1/reference-to-video.md) (`vidu/q1/reference-to-video`): $0.40 / run
- [Vidu · Q2 · Reference to Video · Pro](https://doitong.com/developers/models/vidu/q2/reference-to-video/pro.md) (`vidu/q2/reference-to-video/pro`): from $0.20 / run
- [Vidu · Q3 · Reference to Video · Mix](https://doitong.com/developers/models/vidu/q3/reference-to-video/mix.md) (`vidu/q3/reference-to-video/mix`): from $0.07 / second

## Links

- HTML page: https://doitong.com/developers/models/vidu/q4/reference-to-video
- All models and guides for AI agents: https://doitong.com/developers/llms.txt
- OpenAPI 3.1 with this model's typed request body: https://doitong.com/developers/openapi.json?model=vidu/q4/reference-to-video
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.com/v1/models/vidu/q4/reference-to-video