# MMAudio V2 API

> Thêm hiệu ứng âm thanh và âm thanh môi trường đồng bộ vào video không tiếng từ mô tả văn bản ngắn.

MMAudio V2 xem video và tạo âm thanh phù hợp: tiếng bước chân theo nhịp, tiếng nước bắn, động cơ, đám đông và âm thanh môi trường trong phòng, theo hướng dẫn của lời nhắc và lời nhắc phủ định tùy chọn. Tạo âm thanh dài 1 đến 30 giây và trả về video cùng nhạc nền mới.

- Model id: `mmaudio-v2`
- Made by: Sony AI
- Category: Audio
- Output: video
- Price: $0.001 / second (8 s ≈ $0.008) (cheapest run $0.008 (8 API credits))
- Run: `POST https://api.doitong.com/v1/run/mmaudio-v2`
- Quote: `POST https://api.doitong.com/v1/quote/mmaudio-v2`
- Docs page: https://doitong.com/vi/developers/models/mmaudio-v2

## Pricing

Price: **$0.001 / second (8 s ≈ $0.008)**. Billed per second of output (`duration`, default 8).

The full example input below costs $0.006 = 6 API credits (6 s × 1 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/mmaudio-v2` 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 dùng làm nguồn để tạo âm thanh. |
| `prompt` |  | string | yes |  |  | Lời nhắc mô tả âm thanh cần tạo. |
| `negative_prompt` |  | string | no | `` |  | Lời nhắc phủ định chỉ định nội dung cần loại trừ khi tạo âm thanh. |
| `seed` |  | integer \| null | no |  | 0 – 65,535 | Giá trị seed được bộ tạo số ngẫu nhiên sử dụng. |
| `num_steps` |  | integer | no | `25` | 4 – 50 | Số bước dùng để tạo âm thanh. |
| `duration` |  | number | no | `8` | 1 – 30 | Độ dài âm thanh được tạo. |
| `cfg_strength` |  | number | no | `4.5` | 0 – 20 | Cường độ Classifier Free Guidance. |
| `mask_away_clip` |  | boolean | no | `false` |  | Điều khiển việc clip có bị che đi hay không. |

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",
  "prompt": "Night forest ambience, soft paws running on grass, crickets, gentle magical chimes"
}
```

A fuller example:

```json
{
  "video": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
  "prompt": "Night forest ambience, soft paws running on grass, crickets, gentle magical chimes",
  "duration": 6
}
```

## 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/mmaudio-v2?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "video": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "prompt": "Night forest ambience, soft paws running on grass, crickets, gentle magical chimes",
    "duration": 6
  }'

# 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/mmaudio-v2?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "video": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "prompt": "Night forest ambience, soft paws running on grass, crickets, gentle magical chimes",
    "duration": 6
  }),
});
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": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "prompt": "Night forest ambience, soft paws running on grass, crickets, gentle magical chimes",
    "duration": 6,
}

# Run the model; wait up to 20 s for the finished result in the same call
r = requests.post(API + "/run/mmaudio-v2", 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": "mmaudio-v2",
      "input": {
        "video": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
        "prompt": "Night forest ambience, soft paws running on grass, crickets, gentle magical chimes",
        "duration": 6
      },
      "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": "mmaudio-v2",
  "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": 6,
    "usd": "0.006",
    "charged": 6,
    "refunded": 0
  },
  "input": {
    "video": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "prompt": "Night forest ambience, soft paws running on grass, crickets, gentle magical chimes",
    "duration": 6
  },
  "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.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 đầu ra chứa chuyển động môi đã đồng bộ. |

## Related models

- [MMAudio V2 Text to Audio](https://doitong.com/developers/models/mmaudio-v2/text-to-audio.md) (`mmaudio-v2/text-to-audio`): $0.001 / second
- [DeepFilterNet 3](https://doitong.com/developers/models/deepfilternet3.md) (`deepfilternet3`): $0.001 / second of input audio
- [Demucs](https://doitong.com/developers/models/demucs.md) (`demucs`): $0.0007 / second of input audio
- [ElevenLabs Audio Isolation](https://doitong.com/developers/models/elevenlabs/audio-isolation.md) (`elevenlabs/audio-isolation`): $0.10 / minute of input file
- [Elevenlabs Sound Effects V2](https://doitong.com/developers/models/elevenlabs/sound-effects/v2.md) (`elevenlabs/sound-effects/v2`): $0.002 / second
- [ElevenLabs Voice Changer](https://doitong.com/developers/models/elevenlabs/voice-changer.md) (`elevenlabs/voice-changer`): $0.30 / minute of input audio
- [FFmpeg API \[Merge Audios\]](https://doitong.com/developers/models/ffmpeg-api/merge-audios.md) (`ffmpeg-api/merge-audios`): $0.00017 / second of processing time
- [Ffmpeg Api · Loudnorm](https://doitong.com/developers/models/ffmpeg-api/loudnorm.md) (`ffmpeg-api/loudnorm`): $0.00017 / second of processing time

## Links

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