# Longcat Single Avatar · Audio to Video API

> Crea un vídeo de avatar parlante controlado únicamente por un archivo de audio y un prompt de texto, sin imagen de origen

Genera un vídeo de avatar con sincronización labial a partir de `audio_url` y un `prompt` que describe a la persona. La salida es 480p o 720p. `num_segments` (de 1 a 10) establece la duración: el primer segmento dura unos 5.8 segundos y cada uno posterior añade 5 segundos. `audio_guidance_scale` (de 1 a 10) controla hasta qué punto el habla dirige la boca; los valores altos pueden exagerar el movimiento.

- Model id: `longcat-single-avatar/audio-to-video`
- Made by: Meituan
- Category: Lipsync & Avatars
- Output: video
- Price per second of your output video: from $0.15 / second of output video (cheapest run $0.15 (150 API credits))
- Run: `POST https://api.doitong.ru/v1/run/longcat-single-avatar/audio-to-video`
- Quote: `POST https://api.doitong.ru/v1/quote/longcat-single-avatar/audio-to-video`
- Docs page: https://doitong.com/es-ES/developers/models/longcat-single-avatar/audio-to-video

## Pricing

Price: **from $0.15 / second of output video** (the lowest tier; the quote prices your exact input). Price per second of your output 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.

Price by tier:

- base rate: $0.15 / second of output video
- 720p: $0.60 / second of output video

The full example input below costs $0.90 = 900 API credits (6 s output video × $0.15).

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/longcat-single-avatar/audio-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 |
|---|---|---|---|---|---|---|
| `audio_url` | `audio` | string (audio URL) | yes |  |  | URL del archivo de audio utilizado para controlar el avatar. |
| `prompt` |  | string | no | `A person is talking naturally with natural expressions and movements.` |  | Prompt que dirige la generación de vídeo. |
| `negative_prompt` |  | string | no | `Close-up, Bright tones, overexposed, static, blurred details, subtitles, style, works, paintings, images, static, overall gray, worst quality, low quality, JPEG compression residue, ugly, incomplete, extra fingers, poorly drawn hands, poorly drawn faces, deformed, disfigured, misshapen limbs, fused fingers, still picture, messy background, three legs, many people in the background, walking backwards` |  | Prompt negativo que especifica lo que la generación de vídeo debe evitar. |
| `num_inference_steps` |  | integer | no | `50` | 10 – 100 | Número de pasos de inferencia realizados. |
| `text_guidance_scale` |  | number | no | `4` | 1 – 10 | Escala de guía textual aplicada en la guía sin clasificador. |
| `audio_guidance_scale` |  | number | no | `4` | 1 – 10 | Ajuste de guía de audio que puede exagerar el movimiento de la boca al aumentarlo. |
| `resolution` |  | enum (string) | no | `480p` | `480p`, `720p` | Resolución del vídeo de salida, 480p o 720p. |
| `num_segments` |  | integer | no | `1` | 1 – 10 | Número de segmentos de vídeo, con aproximadamente 5.8s para el segmento inicial y 5s para cada segmento posterior: unos 5 segundos de vídeo por segmento. |
| `seed` |  | integer \| null | no |  |  | Valor de semilla que inicializa la generación de números aleatorios. |
| `enable_safety_checker` |  | boolean | no | `true` |  | Activador de comprobación de seguridad sujeto a los permisos de la cuenta: las comprobaciones siguen siendo obligatorias para las solicitudes no autorizadas y desactivarlas requiere autorización. |
| `enable_prompt_expansion` |  | boolean | no | `false` |  | Activador de expansión del prompt basada en LLM para mejorar la calidad del vídeo mediante un prompt mejorado. |

File parameters (`audio`) 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
{
  "audio": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3"
}
```

A fuller example:

```json
{
  "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3"
}
```

## 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/longcat-single-avatar/audio-to-video?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3"
  }'

# 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/longcat-single-avatar/audio-to-video?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3"
  }),
});
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 = {
    "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3",
}

# Run the model; wait up to 20 s for the finished result in the same call
r = requests.post(API + "/run/longcat-single-avatar/audio-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": "longcat-single-avatar/audio-to-video",
      "input": {
        "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3"
      },
      "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": "longcat-single-avatar/audio-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": 900,
    "usd": "0.90",
    "charged": 900,
    "refunded": 0
  },
  "input": {
    "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3"
  },
  "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
    },
    "seed": 42
  },
  "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} | Archivo de vídeo producido por la generación. |
| `seed` | integer | Valor de semilla aplicado durante la generación. |

## Related models

- [Longcat Single Avatar · Image Audio to Video](https://doitong.com/developers/models/longcat-single-avatar/image-audio-to-video.md) (`longcat-single-avatar/image-audio-to-video`): from $0.15 / second of output 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
- [Infinitalk](https://doitong.com/developers/models/infinitalk.md) (`infinitalk`): from $0.20 / second of output video
- [Infinitalk · Single Text](https://doitong.com/developers/models/infinitalk/single-text.md) (`infinitalk/single-text`): from $2.32 / run
- [Infinitalk · Video to Video](https://doitong.com/developers/models/infinitalk/video-to-video.md) (`infinitalk/video-to-video`): from $0.30 / second of output video
- [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/longcat-single-avatar/audio-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=longcat-single-avatar/audio-to-video
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.ru/v1/models/longcat-single-avatar/audio-to-video