# Workflow Utilities Auto Subtitle API

> 単語ハイライト付きのTikTok風字幕を動画に焼き込み。フォント、色、位置を制御可能

動画内の音声を書き起こし、現在発話中の単語をハイライトした字幕を焼き込みます。スタイル設定には任意のGoogle Font名、サイズ20〜150、太さ、文字色とハイライト色、縁取り、背景色と不透明度、上・中央・下の配置、垂直オフセットが含まれます。`words_per_subtitle`は1〜12で、バウンスアニメーションをオンまたはオフにできます。書き起こしと単語ごとのタイミングも返します。

- Model id: `workflow-utilities/auto-subtitle`
- Made by: Utility
- Category: Video to Video
- Output: video
- Price per minute of your input video: $0.03 / minute of input video (cheapest run $0.03 (30 API credits))
- Run: `POST https://api.doitong.com/v1/run/workflow-utilities/auto-subtitle`
- Quote: `POST https://api.doitong.com/v1/quote/workflow-utilities/auto-subtitle`
- Docs page: https://doitong.com/ja/developers/models/workflow-utilities/auto-subtitle

## Pricing

Price: **$0.03 / minute of input video**. Price per minute of your input video: the input files are measured before the run (length, resolution, frame rate). The quote measures the same files and is exactly what the run charges.

The full example input below costs $0.005 = 5 API credits (0.1667 min input video × $0.03).

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/workflow-utilities/auto-subtitle` 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 |
|---|---|---|---|---|---|---|
| `video_url` | `video` | string (video URL) | yes |  |  | 自動字幕追加用の動画URLです。 |
| `language` |  | string | no | `en` |  | 文字起こし言語識別子。'en'、'es'、'fr'、'de'、'it'、'pt'、'nl'、'ja'、'zh'、'ko'などを指定します。'eng'、'spa'、'fra'などの3文字ISO識別子も使用できます。 |
| `font_name` |  | string | no | `Montserrat` |  | fonts.google.comから選択するフォント名。'Montserrat'、'Poppins'、'BBH Sans Hegarty'など、Google Fontであれば使用できます。 |
| `font_size` |  | integer | no | `100` | 20 – 150 | 字幕のフォントサイズ。TikTokのスタイルでは大きめのテキストを使用します。 |
| `font_weight` |  | enum (string) | no | `bold` | `normal`, `bold`, `black` | テキストの太さ。一般的なTikTokスタイルではboldまたはblackを使用します。 |
| `font_color` |  | enum (string) | no | `white` | `white`, `black`, `red`, `green`, `blue`, `yellow`, `orange`, `purple`, `pink`, `brown`, `gray`, `cyan`, `magenta` | アクティブでない字幕の単語に使用する色です。 |
| `highlight_color` |  | enum (string) | no | `purple` | `white`, `black`, `red`, `green`, `blue`, `yellow`, `orange`, `purple`, `pink`, `brown`, `gray`, `cyan`, `magenta` | 発話中の単語に適用するカラオケ形式のハイライト色です。 |
| `stroke_width` |  | integer | no | `3` | 0 – 10 | テキストのアウトラインまたはストロークの幅（ピクセル）。0では無効になります。 |
| `stroke_color` |  | enum (string) | no | `black` | `black`, `white`, `red`, `green`, `blue`, `yellow`, `orange`, `purple`, `pink`, `brown`, `gray`, `cyan`, `magenta` | テキストのアウトラインまたはストロークに適用する色です。 |
| `background_color` |  | enum (string) | no | `none` | `black`, `white`, `red`, `green`, `blue`, `yellow`, `orange`, `purple`, `pink`, `brown`, `gray`, `cyan`, `magenta`, `none`, `transparent` | テキストの背後の背景色。'none'と'transparent'はいずれも背景を無効にします。 |
| `background_opacity` |  | number | no | `0` | 0 – 1 | 背景の不透明度。0.0は完全に透明、1.0は完全に不透明です。 |
| `position` |  | enum (string) | no | `bottom` | `top`, `center`, `bottom` | 縦軸に沿った字幕の配置です。 |
| `y_offset` |  | integer | no | `75` | -200 – 200 | ピクセル単位の垂直方向の移動量。正の値では下に、負の値では上に移動します。 |
| `words_per_subtitle` |  | integer | no | `3` | 1 – 12 | 字幕の単語数上限。1では1語、2～3では短いフレーズ、8～12ではセグメントごとに全文を表示できます。 |
| `enable_animation` |  | boolean | no | `true` |  | バウンスする表示効果による字幕アニメーションを有効にします。 |

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
{
  "video": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4"
}
```

A fuller example:

```json
{
  "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/auto-subtitle?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "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/auto-subtitle?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "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 = {
    "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/auto-subtitle", 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/auto-subtitle",
      "input": {
        "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/auto-subtitle",
  "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": 5,
    "usd": "0.005",
    "charged": 5,
    "refunded": 0
  },
  "input": {
    "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
    },
    "transcription": "string",
    "subtitle_count": 1,
    "words": [
      {}
    ],
    "transcription_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} | 自動生成された字幕を含む動画です。 |
| `transcription` | string | 文字起こしの完全なテキストです。 |
| `subtitle_count` | integer | 生成された字幕セグメントの数です。 |
| `words` | array of object \| null | 文字起こしサービスが提供する、各単語のタイミングデータです。 |
| `transcription_metadata` | object \| null | ElevenLabsが文字起こしに提供する追加メタデータ。言語、セグメントなどの詳細を含みます。 |

## 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 Blend Video](https://doitong.com/developers/models/workflow-utilities/blend-video.md) (`workflow-utilities/blend-video`): $0.001 / second of processing time
- [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/auto-subtitle
- 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/auto-subtitle
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.com/v1/models/workflow-utilities/auto-subtitle