# Kling LipSync Text-to-Video API

> 讓影片中的人物使用可選的合成語音說出輸入文字，並可調整速度

從文字而非音訊檔案產生唇形同步語音。提供 `video_url`、最多 120 個字元的 `text`，以及從預設語音清單中選取的 `voice_id`。`voice_language` 可為 zh 或 en，`voice_speed` 範圍為 0.8 到 2。來源影片可以是 .mp4 或 .mov，大小上限為 100MB，長度為 2 到 60 秒，解析度為 720p 或 1080p。

- Model id: `kling-video/lipsync/text-to-video`
- Made by: Kling
- Category: Lipsync & Avatars
- Output: video
- Price per second of your input video: $0.014 / second of input video (cheapest run $0.014 (14 API credits))
- Run: `POST https://api.doitong.ru/v1/run/kling-video/lipsync/text-to-video`
- Quote: `POST https://api.doitong.ru/v1/quote/kling-video/lipsync/text-to-video`
- Docs page: https://doitong.com/zh-TW/developers/models/kling-video/lipsync/text-to-video

## Pricing

Price: **$0.014 / 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 $0.14 = 140 API credits (10 s input video × $0.014).

Prices are the upstream price in USD, paid from the API balance in API credits (1000 API credits = 1 USD). `POST https://api.doitong.ru/v1/quote/kling-video/lipsync/text-to-video` 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 |
|---|---|---|---|---|---|---|
| `enable_safety_checker` |  | boolean | no | `true` |  | 只有經帳戶授權才能停用安全檢查；未經授權的請求一律會接受檢查。 |
| `video_url` | `video` | string (video URL) | yes |  |  | 用於唇形同步生成的影片 URL。接受大小不超過 100MB、長度為 2–60s 的 .mp4 或 .mov 檔案，且僅支援 720p 或 1080p；兩個尺寸都必須介於 720–1920px 之間。驗證失敗時會傳回錯誤。 |
| `text` |  | string | yes |  | ≤ 120 characters | 用於生成唇形同步影片的文字，限制為 120 個字元。 |
| `voice_id` |  | enum (string) | yes |  | `genshin_vindi2`, `zhinen_xuesheng`, `AOT`, `ai_shatang`, `genshin_klee2`, `genshin_kirara`, `ai_kaiya`, `oversea_male1`, `ai_chenjiahao_712`, `girlfriend_4_speech02`, `chat1_female_new-3`, `chat_0407_5-1`, `cartoon-boy-07`, `uk_boy1`, `cartoon-girl-01`, `PeppaPig_platform`, `ai_huangzhong_712`, `ai_huangyaoshi_712`, `ai_laoguowang_712`, `chengshu_jiejie`, `you_pingjing`, `calm_story1`, `uk_man2`, `laopopo_speech02`, `heainainai_speech02`, `reader_en_m-v1`, `commercial_lady_en_f-v1`, `tiyuxi_xuedi`, `tiexin_nanyou`, `girlfriend_1_speech02`, `girlfriend_2_speech02`, `zhuxi_speech02`, `uk_oldman3`, `dongbeilaotie_speech02`, `chongqingxiaohuo_speech02`, `chuanmeizi_speech02`, `chaoshandashu_speech02`, `ai_taiwan_man2_speech02`, `xianzhanggui_speech02`, `tianjinjiejie_speech02`, `diyinnansang_DB_CN_M_04-v2`, `yizhipiannan-v1`, `guanxiaofang-v2`, `tianmeixuemei-v1`, `daopianyansang-v1`, `mengwa-v1` | 用於語音合成的語音識別碼。 |
| `voice_language` |  | enum (string) | no | `en` | `zh`, `en` | 與所選 Voice ID 相關聯的語言。 |
| `voice_speed` |  | number | no | `1` | 0.8 – 2 | 從文字生成影片時使用的語速。 |

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",
  "text": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
  "voice_id": "genshin_vindi2"
}
```

A fuller example:

```json
{
  "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
  "text": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
  "voice_id": "genshin_vindi2"
}
```

## 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/kling-video/lipsync/text-to-video?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",
    "text": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
    "voice_id": "genshin_vindi2"
  }'

# 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/kling-video/lipsync/text-to-video?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "text": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
    "voice_id": "genshin_vindi2"
  }),
});
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_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "text": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
    "voice_id": "genshin_vindi2",
}

# Run the model; wait up to 20 s for the finished result in the same call
r = requests.post(API + "/run/kling-video/lipsync/text-to-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.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": "kling-video/lipsync/text-to-video",
      "input": {
        "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
        "text": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
        "voice_id": "genshin_vindi2"
      },
      "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": "kling-video/lipsync/text-to-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": 140,
    "usd": "0.14",
    "charged": 140,
    "refunded": 0
  },
  "input": {
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "text": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
    "voice_id": "genshin_vindi2"
  },
  "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.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} | 模型產生的影片。 |

## Related models

- [Kling LipSync Audio-to-Video](https://doitong.com/developers/models/kling-video/lipsync/audio-to-video.md) (`kling-video/lipsync/audio-to-video`): $0.014 / 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
- [Kling AI Avatar](https://doitong.com/developers/models/kling-video/v1/standard/ai-avatar.md) (`kling-video/v1/standard/ai-avatar`): $0.0562 / second of input audio
- [Kling AI Avatar Pro](https://doitong.com/developers/models/kling-video/v1/pro/ai-avatar.md) (`kling-video/v1/pro/ai-avatar`): $0.115 / second of input audio
- [Kling AI Avatar v2 Standard](https://doitong.com/developers/models/kling-video/ai-avatar/v2/standard.md) (`kling-video/ai-avatar/v2/standard`): $0.0562 / second of input audio
- [AI Avatar Multi](https://doitong.com/developers/models/ai-avatar/multi.md) (`ai-avatar/multi`): from $0.20 / second of output video

## Links

- HTML page: https://doitong.com/developers/models/kling-video/lipsync/text-to-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=kling-video/lipsync/text-to-video
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.ru/v1/models/kling-video/lipsync/text-to-video