# Ffmpeg Api · Merge Videos API

> Ενώνει δύο ή περισσότερα βίντεο από URL σε ένα κλιπ, με προαιρετικό ρυθμό καρέ και ανάλυση εξόδου

Συνενώνει με τη σειρά τα βίντεο που αναφέρονται στο `video_urls`· απαιτούνται τουλάχιστον 2. Το `target_fps` (1 έως 60) ορίζει τον ρυθμό καρέ εξόδου· διαφορετικά χρησιμοποιείται ο χαμηλότερος ρυθμός καρέ εισόδου. Το μέγεθος εξόδου μπορεί να οριστεί με `resolution` (προκαθορισμένες ή προσαρμοσμένες τιμές πλάτους και ύψους από 512 έως 2048) ή να ληφθεί από μία είσοδο μέσω `resolution_aspect_ratio_video_index`. Το αποτέλεσμα περιλαμβάνει το συγχωνευμένο βίντεο και μεταδεδομένα για τις πηγές.

- 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.ru/v1/run/ffmpeg-api/merge-videos`
- Quote: `POST https://api.doitong.ru/v1/quote/ffmpeg-api/merge-videos`
- Docs page: https://doitong.com/el/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.ru/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 | URL βίντεο σε σειρά συγχώνευσης. |
| `target_fps` |  | number \| null | no |  | 1 – 60 | Ορίζει το FPS του βίντεο εξόδου για παράκαμψη της προεπιλογής, η οποία χρησιμοποιεί τον χαμηλότερο ρυθμό καρέ μεταξύ των βίντεο εισόδου. |
| `resolution` |  | object {width, height} \| enum (string) \| null | no |  | `square_hd`, `square`, `portrait_4_3`, `portrait_16_9`, `landscape_4_3`, `landscape_16_9` | Επιλέγει την ανάλυση του τελικού βίντεο με τις δύο διαστάσεις—πλάτος και ύψος—στο εύρος 512 έως 2048. |
| `resolution_aspect_ratio_video_index` |  | integer \| null | no |  | ≥ 0 | Δείκτης βίντεο εισόδου με βάση το μηδέν, που καθορίζει την αναλογία διαστάσεων όταν δεν έχει καθοριστεί ανάλυση. Αν παραλειφθεί, χρησιμοποιούνται το μικρότερο πλάτος και το μικρότερο ύψος από όλα τα βίντεο εισόδου. |

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.ru/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.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/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.ru/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.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": "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.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} | Αρχείο βίντεο που παράγεται από τη συγχώνευση. |
| `metadata` | object | Μεταδεδομένα του συγχωνευμένου βίντεο, συμπεριλαμβανομένων πληροφοριών για τα αρχικά βίντεο. |

## 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.ru/v1/models/ffmpeg-api/merge-videos