# Heygen · v2 · Translate · Precision API

> Translates a video of up to 8 minutes into another language, using the higher-precision mode

Translates the speech in a video into a target `output_language`; the list shown includes English, Spanish, French, Hindi and Japanese among 178 options. Source videos can be up to 8 minutes long. You can translate the audio track only, set `speaker_num`, apply a brand glossary, supply a custom SRT, and request an SRT caption file. This is the precision variant.

- Model id: `heygen/v2/translate/precision`
- Made by: HeyGen
- Category: Lipsync & Avatars
- Output: video
- Price per second of your input video: $0.10 / second of input video (cheapest run $0.10 (100 API credits))
- Run: `POST https://api.doitong.com/v1/run/heygen/v2/translate/precision`
- Quote: `POST https://api.doitong.com/v1/quote/heygen/v2/translate/precision`
- Docs page: https://doitong.com/developers/models/heygen/v2/translate/precision

## Pricing

Price: **$0.10 / second of input video**. Price per second 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 $1.00 = 1000 API credits (10 s input video × $0.10).

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/heygen/v2/translate/precision` 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 |  |  | Source video URL for translation; video duration must not exceed 8 minutes. |
| `output_language` |  | enum (string) | yes |  | `English`, `Spanish`, `French`, `Hindi`, `Italian`, `German`, `Polish`, `Portuguese`, `Chinese`, `Japanese`, `Dutch`, `Turkish`, `Korean`, `Danish`, `Arabic`, `Romanian`, `Mandarin`, `Filipino`, `Swedish`, `Indonesian`, `Ukrainian`, `Greek`, `Czech`, `Bulgarian`, `Malay`, `Slovak`, `Croatian`, `Tamil`, `Finnish`, `Russian`, `Afrikaans (South Africa)`, `Albanian (Albania)`, `Amharic (Ethiopia)`, `Arabic (Algeria)`, `Arabic (Bahrain)`, `Arabic (Egypt)`, `Arabic (Iraq)`, `Arabic (Jordan)`, `Arabic (Kuwait)`, `Arabic (Lebanon)`, `Arabic (Libya)`, `Arabic (Morocco)`, `Arabic (Oman)`, `Arabic (Qatar)`, `Arabic (Saudi Arabia)`, `Arabic (Syria)`, `Arabic (Tunisia)`, `Arabic (United Arab Emirates)`, `Arabic (Yemen)`, `Armenian (Armenia)`, `Azerbaijani (Latin, Azerbaijan)`, `Bangla (Bangladesh)`, `Basque`, `Bengali (India)`, `Bosnian (Bosnia and Herzegovina)`, `Bulgarian (Bulgaria)`, `Burmese (Myanmar)`, `Catalan`, `Chinese (Cantonese, Traditional)`, `Chinese (Jilu Mandarin, Simplified)`, `Chinese (Mandarin, Simplified)`, `Chinese (Northeastern Mandarin, Simplified)`, `Chinese (Southwestern Mandarin, Simplified)`, `Chinese (Taiwanese Mandarin, Traditional)`, `Chinese (Wu, Simplified)`, `Chinese (Zhongyuan Mandarin Henan, Simplified)`, `Chinese (Zhongyuan Mandarin Shaanxi, Simplified)`, `Croatian (Croatia)`, `Czech (Czechia)`, `Danish (Denmark)`, `Dutch (Belgium)`, `Dutch (Netherlands)`, `English (Australia)`, `English (Canada)`, `English (Hong Kong SAR)`, `English (India)`, `English (Ireland)`, `English (Kenya)`, `English (New Zealand)`, `English (Nigeria)`, `English (Philippines)`, `English (Singapore)`, `English (South Africa)`, `English (Tanzania)`, `English (UK)`, `English (United States)`, `Estonian (Estonia)`, `Filipino (Philippines)`, `Finnish (Finland)`, `French (Belgium)`, `French (Canada)`, `French (France)`, `French (Switzerland)`, `Galician`, `Georgian (Georgia)`, `German (Austria)`, `German (Germany)`, `German (Switzerland)`, `Greek (Greece)`, `Gujarati (India)`, `Hebrew (Israel)`, `Hindi (India)`, `Hungarian (Hungary)`, `Icelandic (Iceland)`, `Indonesian (Indonesia)`, `Irish (Ireland)`, `Italian (Italy)`, `Japanese (Japan)`, `Javanese (Latin, Indonesia)`, `Kannada (India)`, `Kazakh (Kazakhstan)`, `Khmer (Cambodia)`, `Korean (Korea)`, `Lao (Laos)`, `Latvian (Latvia)`, `Lithuanian (Lithuania)`, `Macedonian (North Macedonia)`, `Malay (Malaysia)`, `Malayalam (India)`, `Maltese (Malta)`, `Marathi (India)`, `Mongolian (Mongolia)`, `Nepali (Nepal)`, `Norwegian Bokmål (Norway)`, `Pashto (Afghanistan)`, `Persian (Iran)`, `Polish (Poland)`, `Portuguese (Brazil)`, `Portuguese (Portugal)`, `Romanian (Romania)`, `Russian (Russia)`, `Serbian (Latin, Serbia)`, `Sinhala (Sri Lanka)`, `Slovak (Slovakia)`, `Slovenian (Slovenia)`, `Somali (Somalia)`, `Spanish (Argentina)`, `Spanish (Bolivia)`, `Spanish (Chile)`, `Spanish (Colombia)`, `Spanish (Costa Rica)`, `Spanish (Cuba)`, `Spanish (Dominican Republic)`, `Spanish (Ecuador)`, `Spanish (El Salvador)`, `Spanish (Equatorial Guinea)`, `Spanish (Guatemala)`, `Spanish (Honduras)`, `Spanish (Mexico)`, `Spanish (Nicaragua)`, `Spanish (Panama)`, `Spanish (Paraguay)`, `Spanish (Peru)`, `Spanish (Puerto Rico)`, `Spanish (Spain)`, `Spanish (United States)`, `Spanish (Uruguay)`, `Spanish (Venezuela)`, `Sundanese (Indonesia)`, `Swahili (Kenya)`, `Swahili (Tanzania)`, `Swedish (Sweden)`, `Tamil (India)`, `Tamil (Malaysia)`, `Tamil (Singapore)`, `Tamil (Sri Lanka)`, `Telugu (India)`, `Thai (Thailand)`, `Turkish (Türkiye)`, `Ukrainian (Ukraine)`, `Urdu (India)`, `Urdu (Pakistan)`, `Uzbek (Latin, Uzbekistan)`, `Vietnamese (Vietnam)`, `Welsh (United Kingdom)`, `Zulu (South Africa)`, `English - Your Accent`, `English - American Accent` | Destination language for the video translation. |
| `translate_audio_only` |  | boolean \| null | no | `false` |  | Restricts translation to the voice track, leaving faces unchanged. |
| `speaker_num` |  | integer \| null | no |  |  | Count of speakers present in the video. |
| `enable_dynamic_duration` |  | boolean \| null | no | `true` |  | Allow duration to adjust dynamically so differences in speaking rate across languages do not disrupt conversational flow. |
| `brand_glossary_id` |  | string \| null | no |  |  | Identifier selecting a HeyGen brand glossary to customize translations of terms. |
| `srt_url` |  | string \| null | no |  |  | Optional custom subtitle file URL in SRT format. |
| `srt_role` |  | enum (string) \| null | no |  | `input`, `output` | Specifies whether the supplied SRT belongs to the original video or its translation. |
| `enable_caption` |  | boolean | no | `false` |  | Controls creation of a separate SRT caption file accompanying the translated video. |

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",
  "output_language": "English"
}
```

A fuller example:

```json
{
  "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
  "output_language": "English"
}
```

## 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/heygen/v2/translate/precision?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",
    "output_language": "English"
  }'

# 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/heygen/v2/translate/precision?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "output_language": "English"
  }),
});
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",
    "output_language": "English",
}

# Run the model; wait up to 20 s for the finished result in the same call
r = requests.post(API + "/run/heygen/v2/translate/precision", 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": "heygen/v2/translate/precision",
      "input": {
        "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
        "output_language": "English"
      },
      "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": "heygen/v2/translate/precision",
  "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": 1000,
    "usd": "1.00",
    "charged": 1000,
    "refunded": 0
  },
  "input": {
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "output_language": "English"
  },
  "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
    },
    "caption_file": {
      "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} | Video file containing the translation. |
| `caption_file` | object {url, content_type, file_name, file_size} \| null | SRT captions produced when `enable_caption` is true. |

## Related models

- [Heygen · v2 · Video Agent](https://doitong.com/developers/models/heygen/v2/video-agent.md) (`heygen/v2/video-agent`): $0.937 / run
- [Heygen · v2 · Translate · Speed](https://doitong.com/developers/models/heygen/v2/translate/speed.md) (`heygen/v2/translate/speed`): $0.05 / second of input video
- [Kling AI Avatar 2.0 Pro](https://doitong.com/developers/models/kling-video/ai-avatar/v2/pro.md) (`kling-video/ai-avatar/v2/pro`): $0.115 / second of input audio
- [Sync Lipsync 3](https://doitong.com/developers/models/sync-lipsync/v3.md) (`sync-lipsync/v3`): $8.00 / minute of output video
- [VEED Fabric 1.0](https://doitong.com/developers/models/veed/fabric-1.0.md) (`veed/fabric-1.0`): from $0.08 / second of input audio
- [Heygen Lipsync - Precision](https://doitong.com/developers/models/heygen/v3/lipsync/precision.md) (`heygen/v3/lipsync/precision`): $0.10 / second of output video
- [Heygen Lipsync - Speed](https://doitong.com/developers/models/heygen/v3/lipsync/speed.md) (`heygen/v3/lipsync/speed`): $0.05 / second of output video
- [Heygen v5 Digital Twin](https://doitong.com/developers/models/heygen/avatar5/digital-twin.md) (`heygen/avatar5/digital-twin`): $0.10 / second of input audio

## Links

- HTML page: https://doitong.com/developers/models/heygen/v2/translate/precision
- 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=heygen/v2/translate/precision
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.com/v1/models/heygen/v2/translate/precision