# Ffmpeg Api · Merge Videos API

> Nối hai hoặc nhiều video từ URL thành một clip, với tốc độ khung hình và độ phân giải đầu ra tùy chọn

Nối các video được liệt kê trong `video_urls` theo thứ tự; yêu cầu ít nhất 2 video. `target_fps` (1 đến 60) đặt tốc độ khung hình đầu ra, nếu không sẽ dùng tốc độ thấp nhất trong các đầu vào. Có thể đặt kích thước đầu ra bằng `resolution` (thiết lập sẵn hoặc chiều rộng và chiều cao tùy chỉnh từ 512 đến 2048), hoặc lấy từ một đầu vào qua `resolution_aspect_ratio_video_index`. Kết quả bao gồm video đã nối và siêu dữ liệu về các nguồn.

- Model id: `ffmpeg-api/merge-videos`
- Made by: Utility
- Category: Video to Video
- Output: video
- Charged by usage (up to $0.612 per run, typical $0.005; the rest of the hold is refunded): $0.00017 / second of processing time (cheapest run $0.005 (5 API credits))
- Run: `POST https://api.doitong.com/v1/run/ffmpeg-api/merge-videos`
- Quote: `POST https://api.doitong.com/v1/quote/ffmpeg-api/merge-videos`
- Docs page: https://doitong.com/vi/developers/models/ffmpeg-api/merge-videos

## Pricing

Price: **$0.00017 / second of processing time**. Charged by actual usage at $0.00017 / second of processing time: up to $0.612 per run (the quote gives the maximum for your input), the rest is refunded automatically after the run. A typical run costs $0.005.

The full example input below holds up to $0.612 = 612 API credits (up to 3600 s of processing time × $0.00017) when it starts; a typical run costs $0.005 (5 API credits).

Prices are the upstream price in USD, paid from the API balance in API credits (1000 API credits = 1 USD). This model is charged by usage: `POST https://api.doitong.com/v1/quote/ffmpeg-api/merge-videos` with the same JSON body returns the most the run can cost for that input (`credits`, debited when the run starts); after the run you pay the usage the model reports and the rest is refunded automatically. An input whose maximum would exceed the per-run limit is refused with 422. 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 |
|---|---|---|---|---|---|---|
| `video_urls` | `videos` | array of video URL | yes |  | ≥ 2 items | Các URL video được liệt kê theo thứ tự cần hợp nhất. |
| `target_fps` |  | number \| null | no |  | 1 – 60 | Đặt FPS của video đầu ra để ghi đè mặc định, vốn lấy tốc độ khung hình thấp nhất trong các video đầu vào. |
| `resolution` |  | object {width, height} \| enum (string) \| null | no |  | `square_hd`, `square`, `portrait_4_3`, `portrait_16_9`, `landscape_4_3`, `landscape_16_9` | Chọn độ phân giải của video cuối bằng cả hai kích thước—chiều rộng và chiều cao—trong phạm vi 512 đến 2048. |
| `resolution_aspect_ratio_video_index` |  | integer \| null | no |  | ≥ 0 | Chỉ mục video đầu vào bắt đầu từ 0, quyết định tỷ lệ khung hình khi không chỉ định độ phân giải. Bỏ trống sẽ dùng chiều rộng nhỏ nhất và chiều cao nhỏ nhất tìm thấy trong tất cả video đầu vào. |

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

A fuller example:

```json
{
  "video_urls": [
    "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "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/ffmpeg-api/merge-videos?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "video_urls": [
      "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
      "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/ffmpeg-api/merge-videos?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "video_urls": [
      "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
      "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 = {
    "video_urls": [
        "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
        "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/ffmpeg-api/merge-videos", 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": "ffmpeg-api/merge-videos",
      "input": {
        "video_urls": [
          "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
          "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": "ffmpeg-api/merge-videos",
  "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": 612,
    "usd": "0.612",
    "charged": 612,
    "refunded": 0
  },
  "input": {
    "video_urls": [
      "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
      "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
    },
    "metadata": {}
  },
  "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} | Tệp video được tạo ra bằng cách hợp nhất. |
| `metadata` | object | Siêu dữ liệu của video đã hợp nhất, bao gồm thông tin về các video ban đầu. |

## Related models

- [Ffmpeg Api Images to Video](https://doitong.com/developers/models/ffmpeg-api/images-to-video.md) (`ffmpeg-api/images-to-video`): $0.005 / run
- [Ffmpeg Api · Loudnorm](https://doitong.com/developers/models/ffmpeg-api/loudnorm.md) (`ffmpeg-api/loudnorm`): $0.00017 / second of processing time
- [FFmpeg API Metadata](https://doitong.com/developers/models/ffmpeg-api/metadata.md) (`ffmpeg-api/metadata`): $0.001 / run
- [FFmpeg API Waveform](https://doitong.com/developers/models/ffmpeg-api/waveform.md) (`ffmpeg-api/waveform`): $0.001 / run
- [Auto-Captioner](https://doitong.com/developers/models/auto-caption.md) (`auto-caption`): $0.10 / video
- [FFmpeg API Compose](https://doitong.com/developers/models/ffmpeg-api/compose.md) (`ffmpeg-api/compose`): $0.001 / run
- [Ffmpeg Api Merge Audio-Video](https://doitong.com/developers/models/ffmpeg-api/merge-audio-video.md) (`ffmpeg-api/merge-audio-video`): $0.0002 / second of input video
- [Workflow Utilities Auto Subtitle](https://doitong.com/developers/models/workflow-utilities/auto-subtitle.md) (`workflow-utilities/auto-subtitle`): $0.03 / minute of input video

## Links

- HTML page: https://doitong.com/developers/models/ffmpeg-api/merge-videos
- 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=ffmpeg-api/merge-videos
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.com/v1/models/ffmpeg-api/merge-videos