# Framepack · FLF2V API

> Video Framepack nội suy từ ảnh bắt đầu đến ảnh kết thúc bắt buộc

Tạo video bắt đầu từ `image_url` và chuyển tới `end_image_url`, được dẫn hướng bằng lời nhắc. Giá trị `strength` (0 đến 1, mặc định 0.8) xác định mức ảnh hưởng của khung hình cuối đến kết quả. `num_frames` cho phép từ 30 đến 1800, mặc định 240. Hỗ trợ 16:9 hoặc 9:16 và 480p hoặc 720p.

- Model id: `framepack/flf2v`
- Made by: Open model
- Category: Image to Video
- Output: video
- Estimated price per run: from $0.134 / run (cheapest run $0.134 (134 API credits))
- Run: `POST https://api.doitong.ru/v1/run/framepack/flf2v`
- Quote: `POST https://api.doitong.ru/v1/quote/framepack/flf2v`
- Docs page: https://doitong.com/vi/developers/models/framepack/flf2v

## Pricing

Price: **from $0.134 / run** (the lowest tier; the quote prices your exact input). Estimated from the typical cost of one run. The quote is exactly what the run charges.

Price rules (the first rule that matches the input wins; a parameter you leave out counts as its default):

- When `num_frames` > 1680 and `resolution` = 720p: base price × 17.99
- When `num_frames` ≤ 1680 and `resolution` = 720p: base price × 15.74
- When `num_frames` ≤ 1440 and `resolution` = 720p: base price × 13.49
- When `num_frames` ≤ 1200 and `resolution` = 720p: base price × 11.25
- When `num_frames` ≤ 960 and `resolution` = 720p: base price × 9.0
- When `num_frames` > 1680 and `resolution` = 480p: base price × 8
- When `num_frames` ≤ 1680 and `resolution` = 480p: base price × 7
- When `num_frames` ≤ 720 and `resolution` = 720p: base price × 6.75
- When `num_frames` ≤ 1440 and `resolution` = 480p: base price × 6
- When `num_frames` ≤ 1200 and `resolution` = 480p: base price × 5
- When `num_frames` ≤ 480 and `resolution` = 720p: base price × 4.5
- When `num_frames` ≤ 960 and `resolution` = 480p: base price × 4
- When `num_frames` ≤ 720 and `resolution` = 480p: base price × 3
- When `num_frames` ≤ 240 and `resolution` = 720p: base price × 2.25
- When `num_frames` ≤ 480 and `resolution` = 480p: base price × 2

The full example input below costs $0.134 = 134 API credits (1 request × 134 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.ru/v1/quote/framepack/flf2v` 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 |  |  | Hướng dẫn bằng văn bản để tạo sinh video, giới hạn ở 500 ký tự. |
| `negative_prompt` |  | string | no | `` |  | Lời nhắc phủ định áp dụng khi tạo video. |
| `image_url` | `image` | string (image URL) | yes |  |  | URL trỏ đến hình ảnh đầu vào. |
| `seed` |  | integer \| null | no |  |  | Giá trị seed cho việc tạo sinh video. |
| `aspect_ratio` |  | enum (string) | no | `16:9` | `16:9`, `9:16` | Tỷ lệ khung hình của video đầu ra. |
| `resolution` |  | enum (string) | no | `480p` | `720p`, `480p` | Độ phân giải của video đầu ra. |
| `cfg_scale` |  | number | no | `1` | 0 – 7 | Tỷ lệ được áp dụng cho hướng dẫn không dùng bộ phân loại trong quá trình tạo sinh. |
| `guidance_scale` |  | number | no | `10` | 0 – 32 | Thang đo của hướng dẫn được áp dụng trong quá trình tạo sinh. |
| `num_frames` |  | integer | no | `240` | 30 – 1,800 | Số khung hình của đầu ra được tạo sinh. |
| `enable_safety_checker` |  | boolean | no | `false` |  | Kích hoạt trình kiểm tra an toàn; true bật kiểm tra. |
| `end_image_url` | `end_image` | string (image URL) | yes |  |  | URL trỏ đến hình ảnh đầu vào kết thúc. |
| `strength` |  | number | no | `0.8` | 0 – 1 | Trọng số được gán cho khung hình cuối trong quá trình tạo sinh video; tăng ảnh hưởng của khung hình đó khi giá trị tăng. |

File parameters (`image`, `end_image`) 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",
  "image": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg",
  "end_image": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
}
```

A fuller example:

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

## 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.ru/v1/run/framepack/flf2v?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",
    "image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg",
    "end_image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
  }'

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

### JavaScript

```javascript
const API = "https://api.doitong.ru/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/framepack/flf2v?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",
    "image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg",
    "end_image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
  }),
});
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.ru/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",
    "image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg",
    "end_image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg",
}

# Run the model; wait up to 20 s for the finished result in the same call
r = requests.post(API + "/run/framepack/flf2v", 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.ru/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": "framepack/flf2v",
      "input": {
        "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
        "image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg",
        "end_image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
      },
      "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": "framepack/flf2v",
  "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": 134,
    "usd": "0.134",
    "charged": 134,
    "refunded": 0
  },
  "input": {
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
    "image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg",
    "end_image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
  },
  "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
    },
    "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.ru/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t",
    "cancel": "https://api.doitong.ru/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t/cancel"
  }
}
```

### Output fields (`output`)

| Field | Type | Description |
|---|---|---|
| `video` | object {url, content_type, file_name, file_size} |  |
| `seed` | integer | Giá trị seed được sử dụng trong quá trình tạo sinh video. |

## Related models

- [Framepack](https://doitong.com/developers/models/framepack.md) (`framepack`): from $0.134 / run
- [Framepack F1](https://doitong.com/developers/models/framepack/f1.md) (`framepack/f1`): from $0.134 / run
- [FLUX 3 Max Image to Video](https://doitong.com/developers/models/blackforestlabs/flux-3-max/image-to-video.md) (`blackforestlabs/flux-3-max/image-to-video`): from $0.0425 / second of output video
- [Grok Imagine Video 1.5 Image to Video](https://doitong.com/developers/models/xai/grok-imagine-video/v1.5/image-to-video.md) (`xai/grok-imagine-video/v1.5/image-to-video`): from $0.082 / second
- [Kling 3.0 Pro Image to Video](https://doitong.com/developers/models/kling-video/v3/pro/image-to-video.md) (`kling-video/v3/pro/image-to-video`): from $0.112 / second
- [LTX 2.5 Pro Image to Video](https://doitong.com/developers/models/lightricks/ltx-2.5/image-to-video/pro.md) (`lightricks/ltx-2.5/image-to-video/pro`): from $0.12 / second
- [MiniMax H3 Image to Video](https://doitong.com/developers/models/minimax/h3/image-to-video.md) (`minimax/h3/image-to-video`): from $0.05 / second
- [Seedance 2.0 Fast Image to Video](https://doitong.com/developers/models/bytedance/seedance-2.0/fast/image-to-video.md) (`bytedance/seedance-2.0/fast/image-to-video`): from $0.113 / second

## Links

- HTML page: https://doitong.com/developers/models/framepack/flf2v
- 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=framepack/flf2v
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.ru/v1/models/framepack/flf2v