# Workflow Utilities Blend Video API

> Mischt zwei Videos als Ebenen mit einem ausgewählten Mischmodus und der Deckkraft der oberen Ebene

Kombiniert ein oberes und ein unteres Video mithilfe eines Mischmodus wie overlay, multiply, difference oder screen-ähnlichen Optionen (insgesamt 23 Modi, standardmäßig overlay). `opacity` legt die Stärke der oberen Ebene von 0 bis 1 fest. Ist `shortest` aktiviert, endet die Ausgabe mit dem Ende der kürzeren Eingabe.

- Model id: `workflow-utilities/blend-video`
- Made by: Utility
- Category: Video to Video
- Output: video
- Charged by usage (up to $3.60 per run, typical $0.01; the rest of the hold is refunded): $0.001 / second of processing time (cheapest run $0.01 (10 API credits))
- Run: `POST https://api.doitong.com/v1/run/workflow-utilities/blend-video`
- Quote: `POST https://api.doitong.com/v1/quote/workflow-utilities/blend-video`
- Docs page: https://doitong.com/de/developers/models/workflow-utilities/blend-video

## Pricing

Price: **$0.001 / second of processing time**. Charged by actual usage at $0.001 / second of processing time: up to $3.60 per run (the quote gives the maximum for your input), the rest is refunded automatically after the run. A typical run costs $0.01.

The full example input below holds up to $3.60 = 3600 API credits (up to 3600 s of processing time × $0.001) when it starts; a typical run costs $0.01 (10 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/workflow-utilities/blend-video` 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

| Parameter | Canonical name | Type | Required | Default | Allowed values / range | Description |
|---|---|---|---|---|---|---|
| `top_video_url` |  | string (video URL) | yes |  |  | URL des Videos für die obere Ebene. |
| `bottom_video_url` |  | string (video URL) | yes |  |  | URL des Videos für die untere Ebene. |
| `blend_mode` |  | enum (string) | no | `overlay` | `addition`, `average`, `burn`, `darken`, `difference`, `divide`, `dodge`, `exclusion`, `grainextract`, `grainmerge`, `hardlight`, `lighten`, `multiply`, `negation`, `normal`, `overlay`, `phoenix`, `pinlight`, `reflect`, `screen`, `softlight`, `subtract`, `vividlight` | Mischmethode zum Kombinieren der Videos. |
| `opacity` |  | number | no | `1` | 0 – 1 | Deckkraft der oberen Ebene von 0.0 bis 1.0. |
| `shortest` |  | boolean | no | `true` |  | Beendet die Ausgabe, sobald die kürzeste Eingabe endet. |

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

A fuller example:

```json
{
  "top_video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
  "bottom_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/workflow-utilities/blend-video?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "top_video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "bottom_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/workflow-utilities/blend-video?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "top_video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "bottom_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 = {
    "top_video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "bottom_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/workflow-utilities/blend-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": "workflow-utilities/blend-video",
      "input": {
        "top_video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
        "bottom_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": "workflow-utilities/blend-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": 3600,
    "usd": "3.60",
    "charged": 3600,
    "refunded": 0
  },
  "input": {
    "top_video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "bottom_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
    }
  },
  "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} | Durch Mischen der Eingaben erzeugtes Video. |

## Related models

- [Workflow Utilities Extract Nth Frame](https://doitong.com/developers/models/workflow-utilities/extract-nth-frame.md) (`workflow-utilities/extract-nth-frame`): $0.001 / second of processing time
- [Workflow Utilities Pick Image By Index](https://doitong.com/developers/models/workflow-utilities/pick-image-by-index.md) (`workflow-utilities/pick-image-by-index`): $0.001 / run
- [Workflow Utilities Auto Subtitle](https://doitong.com/developers/models/workflow-utilities/auto-subtitle.md) (`workflow-utilities/auto-subtitle`): $0.03 / minute of input video
- [Workflow Utilities Interleave Video](https://doitong.com/developers/models/workflow-utilities/interleave-video.md) (`workflow-utilities/interleave-video`): $0.00017 / second of processing time
- [Workflow Utilities Reverse Video](https://doitong.com/developers/models/workflow-utilities/reverse-video.md) (`workflow-utilities/reverse-video`): $0.001 / second of processing time
- [Workflow Utilities Scale Video](https://doitong.com/developers/models/workflow-utilities/scale-video.md) (`workflow-utilities/scale-video`): $0.001 / second of processing time
- [Workflow Utilities Trim Video](https://doitong.com/developers/models/workflow-utilities/trim-video.md) (`workflow-utilities/trim-video`): $0.001 / second of processing time
- [Workflow Utilities Audio Compressor](https://doitong.com/developers/models/workflow-utilities/audio-compressor.md) (`workflow-utilities/audio-compressor`): $0.001 / second of processing time

## Links

- HTML page: https://doitong.com/developers/models/workflow-utilities/blend-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=workflow-utilities/blend-video
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.com/v1/models/workflow-utilities/blend-video