# Auto-Captioner API

> Menambah kapsyen berasaskan pertuturan pada video dengan warna, fon, saiz dan kedudukan yang boleh dilaraskan

Ment transkripsi audio daripada `video_url` .mp4 (di bawah 400MB) dan membakar kapsyen ke dalam video. Gayakannya dengan `txt_color`, `txt_font`, `font_size`, `stroke_width` dan `text_case`. Kedudukan menggunakan `left_align` dan `top_align`. `refresh_interval` antara 0.5 hingga 3 saat menetapkan tempoh kapsyen dipaparkan pada skrin.

- Model id: `auto-caption`
- Made by: Utility
- Category: Video to Video
- Output: json
- Price: $0.10 / video (cheapest run $0.10 (100 API credits))
- Run: `POST https://api.doitong.com/v1/run/auto-caption`
- Quote: `POST https://api.doitong.com/v1/quote/auto-caption`
- Docs page: https://doitong.com/ms/developers/models/auto-caption

## Pricing

Price: **$0.10 / video**. Billed once per generated video.

The full example input below costs $0.10 = 100 API credits (1 video × 100 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.com/v1/quote/auto-caption` 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 |  |  | URL video untuk fail .mp4 yang mengandungi audio dan bersaiz kurang daripada 400 MB. |
| `txt_color` |  | string | no | `white` |  | Tetapkan warna teks menggunakan tatatanda heksadesimal, tuple RGB atau nama warna. |
| `txt_font` |  | string | no | `Standard` |  | Tetapkan muka taip kapsyen menggunakan URL yang menunjuk kepada fail .ttf atau fon terbina dalam: 'Arial', 'Standard', 'Garamond', 'Times New Roman' atau 'Georgia'. |
| `font_size` |  | integer | no | `24` |  | Saiz teks untuk kapsyen yang dijana. |
| `stroke_width` |  | integer | no | `1` |  | Ketebalan strok teks, diukur dalam piksel. |
| `left_align` |  | string \| number | no | `center` |  | Jajarkan teks secara mendatar menggunakan float antara 0.0 dan 1.0, atau pilih kedudukan bernama 'left', 'center' atau 'right'. |
| `top_align` |  | string \| number | no | `center` |  | Jajarkan teks secara menegak menggunakan float antara 0.0 dan 1.0, atau pilih kedudukan bernama 'top', 'center' atau 'bottom'. |
| `refresh_interval` |  | number | no | `1.5` | 0.5 – 3 | Kawal jumlah teks kapsyen yang dipaparkan serentak melalui selang paparannya, diukur dalam saat: mengekalkan kapsyen lebih lama memaparkan lebih banyak teks pada satu-satu masa. |
| `text_case` |  | enum (string) | no | `default` | `default`, `upper`, `lower` | Pilih 'default' untuk mengekalkan penggunaan huruf kecil dan besar sari kata seperti yang dihasilkan oleh pengecaman pertuturan. Untuk mengubahnya, pilih 'upper' bagi teks huruf besar atau 'lower' bagi teks huruf kecil. |

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/auto-caption?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/auto-caption?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/auto-caption", 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": "auto-caption",
      "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": "auto-caption",
  "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": 100,
    "usd": "0.10",
    "charged": 100,
    "refunded": 0
  },
  "input": {
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4"
  },
  "output": {
    "video_url": "string"
  },
  "outputs": [
    {
      "type": "file",
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
      "content_type": "image/jpeg",
      "file_size": 1843200,
      "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_url` | string (video URL) | URL yang menunjuk kepada video .mp4 berkapsyen. |

## Related models

- [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
- [Ffmpeg Api · Merge Videos](https://doitong.com/developers/models/ffmpeg-api/merge-videos.md) (`ffmpeg-api/merge-videos`): $0.00017 / second of processing time
- [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 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

## Links

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