# Flux 3 Extend Video Draft API

> موجودہ MP4 کی draft معیار کی توسیع، اختیاری تیار کردہ آڈیو کے ساتھ

ایک ماخذ ویڈیو (`video_url`، MP4، زیادہ سے زیادہ 50 MiB) کو `prompt` کی پیروی کرتے ہوئے بڑھاتا ہے۔ `duration` auto یا سیکنڈز کی ایک مکمل عددی قدر ہے، اور `aspect_ratio` 21:9 سے 9:16 یا auto تک ہوتا ہے۔ `generate_audio` آواز کو فعال یا غیر فعال کرتا ہے، جبکہ `safety_tolerance` 0 سے 4 تک ہے۔ واپس کیا گیا `draft_cache` مکمل معیار کی رینڈرنگ کے لیے `draft-enhance` کو دیا جا سکتا ہے۔

- Model id: `blackforestlabs/flux-3/extend-video/draft`
- Made by: Black Forest Labs
- Category: Video to Video
- Output: video
- Price: $0.12 / second (5 s ≈ $0.60) (cheapest run $0.60 (600 API credits))
- Run: `POST https://api.doitong.com/v1/run/blackforestlabs/flux-3/extend-video/draft`
- Quote: `POST https://api.doitong.com/v1/quote/blackforestlabs/flux-3/extend-video/draft`
- Docs page: https://doitong.com/ur/developers/models/blackforestlabs/flux-3/extend-video/draft

## Pricing

Price: **$0.12 / second (5 s ≈ $0.60)**. Billed per second of output (`duration`, default 20).

The full example input below costs $2.40 = 2400 API credits (20 s × 120 API credits).

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/blackforestlabs/flux-3/extend-video/draft` 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 |  |  | ڈرافٹ ویڈیو کی متنی وضاحت۔ |
| `aspect_ratio` |  | enum (string) | no | `auto` | `auto`, `21:9`, `2:1`, `16:9`, `4:3`, `1:1`, `3:4`, `9:16` | ڈرافٹ آؤٹ پٹ کا پہلو تناسب؛ `auto` انتخاب ماڈل کے سپرد کرتا ہے۔ |
| `duration` |  | enum | no | `auto` | `auto`, `5`, `6`, `7`, `8`, `9`, `10`, `11`, `12`, `13`, `14`, `15`, `16`, `17`, `18`, `19`, `20` | ڈرافٹ کی لمبائی، 5 سے 20 سیکنڈ تک عدد صحیح یا `auto` کے طور پر۔ |
| `generate_audio` |  | boolean | no | `true` |  | ڈرافٹ ویڈیو کے لیے آڈیو کی تخلیق کو کنٹرول کرتا ہے۔ |
| `safety_tolerance` |  | integer | no | `2` | 0 – 4 | ویڈیو سیفٹی ٹالرنس کا اسکیل؛ سب سے زیادہ اجازت دینے والی سیٹنگ 4 اور سب سے سخت 0 ہے۔ |
| `video_url` | `video` | string (video URL) | yes |  |  | URL یا ڈیٹا URI کے ذریعے فراہم کردہ ماخذ MP4، زیادہ سے زیادہ 50 MiB۔ |

File parameters (`video`) 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",
  "video": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4"
}
```

A fuller example:

```json
{
  "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
  "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4"
}
```

## 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/blackforestlabs/flux-3/extend-video/draft?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",
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4"
  }'

# 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/blackforestlabs/flux-3/extend-video/draft?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",
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4"
  }),
});
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",
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
}

# Run the model; wait up to 20 s for the finished result in the same call
r = requests.post(API + "/run/blackforestlabs/flux-3/extend-video/draft", 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": "blackforestlabs/flux-3/extend-video/draft",
      "input": {
        "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
        "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4"
      },
      "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": "blackforestlabs/flux-3/extend-video/draft",
  "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": 2400,
    "usd": "2.40",
    "charged": 2400,
    "refunded": 0
  },
  "input": {
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4"
  },
  "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
    },
    "draft_cache": {
      "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
    }
  },
  "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} | ڈرافٹ کے طور پر تیار کردہ ویڈیو۔ |
| `draft_cache` | object {url, content_type, file_name, file_size} \| null | `draft-enhance` کے ذریعے مکمل معیار میں ڈرافٹ رینڈر کرنے کے لیے کیش ڈیٹا، پائیدار انکرپٹڈ بنڈل میں محفوظ۔ اگر پارٹنر نے ڈرافٹ کے لیے کوئی بنڈل واپس نہ کیا ہو تو یہ آؤٹ پٹ موجود نہیں ہوتا۔ |

## Related models

- [Flux 3 Text To Video Draft](https://doitong.com/developers/models/blackforestlabs/flux-3/text-to-video/draft.md) (`blackforestlabs/flux-3/text-to-video/draft`): $0.06 / second
- [Flux 3 First Last Frame to Video Draft](https://doitong.com/developers/models/blackforestlabs/flux-3/first-last-frame-to-video/draft.md) (`blackforestlabs/flux-3/first-last-frame-to-video/draft`): $0.06 / second
- [Flux 3 Image To Video Draft](https://doitong.com/developers/models/blackforestlabs/flux-3/image-to-video/draft.md) (`blackforestlabs/flux-3/image-to-video/draft`): $0.06 / second
- [Flux 3 Keyframes To Video Draft](https://doitong.com/developers/models/blackforestlabs/flux-3/keyframes-to-video/draft.md) (`blackforestlabs/flux-3/keyframes-to-video/draft`): $0.06 / second
- [Flux 3 Draft Enhance](https://doitong.com/developers/models/blackforestlabs/flux-3/draft-enhance.md) (`blackforestlabs/flux-3/draft-enhance`): $3.48 / run
- [Flux 3 Action](https://doitong.com/developers/models/flux-3-action/so101.md) (`flux-3-action/so101`): $0.003 / run
- [Flux 3 Extend Video](https://doitong.com/developers/models/blackforestlabs/flux-3/extend-video.md) (`blackforestlabs/flux-3/extend-video`): from $0.41 / second
- [Flux 3 FAST Edit Video](https://doitong.com/developers/models/blackforestlabs/flux-3/edit-video.md) (`blackforestlabs/flux-3/edit-video`): $0.03 / second of input video

## Links

- HTML page: https://doitong.com/developers/models/blackforestlabs/flux-3/extend-video/draft
- 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=blackforestlabs/flux-3/extend-video/draft
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.com/v1/models/blackforestlabs/flux-3/extend-video/draft