# Demucs API

> ᠵᡠᠯᡤᡝᠨ ᠠᠪᡴᠠᠨᡳ ᠠᠮᡝᠯᡝᠨ᠈ ᠵᡠᠯᡤᡝᠨᡳ ᠠᠯᡤᠠᠨ᠈ ᠪᠠᠰᡳᠨ᠈ ᠵᡠᠯᡤᡝᠨ ᠶᠠᠮᠠᡴᠠ ᠮᡠᠰᡳᠨ ᠪᡝ ᠵᠠᠯᠠᠨ ᠪᡠᡶᠠᠮᡝ

ᡝᠮᡠ ᠮᡠᠰᡳᡴᡝ ᠪᡝ ᡝᠮᡠ ᡝᠮᡠ ᠮᡠᠰᡳᡴᡝᠨ ᡳ ᡤᡠᠯᡤᡳᠶᠠ ᡩᡝ ᠠᡶᠠᠯᠠᡵᠠᠩᡤᡝ ᠮᡠᠶᠠᡥᡡᠨᡳᠨᠠᠮᠪᡳ. `model` ᠪᡝ ᠰᠣᠩᡤᠣᠯᠣᠮᡝ ᠵᡠᠯᡝ htdemucs_6s ᠰᠣᠩᡤᠣᠯᠣᠮᡝ ᡤᡳᠰᡠᠨ ᡳ ᡤᠠᠯᡤᠠᠨ ᠪᡝ `stems` ᡳ ᠮᡠᠰᡝ ᠵᠠᠪᠰᠠᠨᠠᠮᠪᡳ. `shifts` (1 ᡩᡝ 10), `overlap` (0 ᡩᡝ 1) ᡳ `segment_length` ᠪᡝ ᠵᠠᠰᠠᠮᡝ ᡤᡠᠯᠮᡝᠯᡝ ᠵᠠᠰᠠᠨᠠᠮᠪᡳ. ᡤᠠᠯᡤᠠᠨ ᠪᡝ mp3 ᡠᠨᡩᡝ wav ᡶᡳᠯᡝ ᠵᠠᠯᠠᠨ ᠵᡠᠯᡝᡥᡝ ᠵᠠᠯᡠ ᠪᡝ ᠵᡠᠯᡝᠨ ᠪᡠᠶᠠᠮᠪᡳ.

- Model id: `demucs`
- Made by: Meta
- Category: Audio
- Output: json
- Price per second of your input audio: $0.0007 / second of input audio (cheapest run $0.001 (1 API credit))
- Run: `POST https://api.doitong.ru/v1/run/demucs`
- Quote: `POST https://api.doitong.ru/v1/quote/demucs`
- Docs page: https://doitong.com/mnc/developers/models/demucs

## Pricing

Price: **$0.0007 / second of input audio**. Price per second of your input audio: 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 $0.007 = 7 API credits (10 s input audio × $0.0007).

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/demucs` 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 |  |  | ᡤᡳᠰᡠᠨ ᠪᡝ ᡶᠠᡴᠴᠠᡵᠠ ᡤᡳᠰᡠᠨ ᡶᡳᠯᡝ ᡳ URL᠉ |
| `model` |  | enum (string) | no | `htdemucs_6s` | `htdemucs`, `htdemucs_ft`, `htdemucs_6s`, `hdemucs_mmi`, `mdx`, `mdx_extra`, `mdx_q`, `mdx_extra_q` | ᡤᡳᠰᡠᠨ ᠪᡝ ᡶᠠᡴᠴᠠᡵᠠ ᠪᠠᡳᡨᠠᠯᠠᡵᡝ Demucs ᠮᠣᡩᡝᠯ᠉ |
| `stems` |  | array of enum (string) \| null | no | `["vocals","drums","bass","other","guitar","piano"]` |  | ᠮᠣᠳᡝᠯ ᡳ ᠠᠪᠠᠯᠠᠮᡝ ᠪᡠᠶᡝᠮᡝᠰᡳ ᡳᠯᡳᡥᠠᠨ ᡳ ᡳᠯᠠᠨ: vocals, drums, bass, other, guitar, piano (6s ᠮᠣᡩᡝᠯ ᡩᡝ). ᠵᠠᠯᡠ ᠰᡝᠮᡝ None ᠪᡠᡵᡳ ᡝᠯᡳᠮᡝᠨ ᡳ ᡶᡳᠯᡝᠮᡝ ᠪᡝ ᡝᠮᡤᡳ ᠠᠪᠠᠮᠪᡳ᠉ |
| `segment_length` |  | integer \| null | no |  | ≥ 1 | ᡝᠨᡝᠮᡝᠨ ᡳ ᠵᡠᠯᡝ ᠰᡝᡴᡠᠨᡩ ᡩᡠᠷᠠᠨᠠᠯᠠᠮᡝ᠂ ᠮᠣᡩᡝᠯ ᡳ ᠵᠠᠯᡠ ᠵᠠᠯᠠᠨ. ᠪᡠᠶᡝᠮᡝ ᠪᠠᠨᠵᡳᡥᠠ ᠣᠮᠪᡳ᠂ ᡝᠨᡝ ᠪᠠᠨᠵᡳᠨᠠᠮᡝ ᠶᠠᠯᡳ ᠪᡳᠰᡳᠨᡳ ᡤᠠᠷᡠᠯᠠᠮᡝ; ᠵᠠᠯᡠᠨ 1᠉ |
| `shifts` |  | integer | no | `1` | 1 – 10 | ᠮᡝᠶᡝᠨᡳ ᠵᠠᠯᠠᠨ ᡳ ᡩᡠᠷᠠᠨᠠᠯᠠᠮᡝ ᠠᠵᠠᠯᡤᠠᠨ ᡳ ᡝᠮᡤᡳ ᠠᠯᡳᠨ ᠪᡝ ᠣᠮᠪᡳ᠉ ᠣᠯᡥᠣ ᠵᠠᠯᠠᠨ ᠨᡝ ᠣᠯᡥᠣ ᠰᡠᠯᡠ ᡥᠠᠶᠠᠨ ᡤᠠᠶᠠᠮᡝ᠉ |
| `overlap` |  | number | no | `0.25` | 0 – 1 | ᡝᠨᡝᠮᡝᠨ ᡳ ᠵᠣᠯᡤᠣᠨ ᠪᡠᠶᡝᠮᡝ ᡳ ᡩᡠᠷᠠᠨᠠᠯᠠᠮᡝ ᠮᠠᠨᠵᡳᠮᡝ ᠪᡳᠰᡳᠨᡳ ᠰᡠᠯᡠ ᡩᡠᠷᠠᠨᠠᠯᠠᠮᡝ ᠵᠠᠯᠠᠨᠠᠮᡝ; ᠠᠵᠠᠯᠠᠮᡝ 0.0–1.0᠉ |
| `output_format` |  | enum (string) | no | `mp3` | `wav`, `mp3` | ᡝᠯᡳᠮᡝᠨ ᡳ ᡶᡳᠯᡝᠮᡝ ᠪᡝ ᠵᠠᠯᠠᠮᡝ ᠪᠠᠳᠠᠷᠠᠮᡝ ᠵᡠᠯᡝ ᡤᡳᠰᡠᠨ ᡳ ᠮᠠᠨᠵᡳᠮᡝ᠉ |

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/demucs?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/demucs?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/demucs", 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": "demucs",
      "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": "demucs",
  "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": 7,
    "usd": "0.007",
    "charged": 7,
    "refunded": 0
  },
  "input": {
    "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3"
  },
  "output": {
    "vocals": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
      "content_type": "image/jpeg",
      "file_name": "0-output.jpeg",
      "file_size": 1843200
    },
    "drums": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
      "content_type": "image/jpeg",
      "file_name": "0-output.jpeg",
      "file_size": 1843200
    },
    "bass": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
      "content_type": "image/jpeg",
      "file_name": "0-output.jpeg",
      "file_size": 1843200
    },
    "other": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
      "content_type": "image/jpeg",
      "file_name": "0-output.jpeg",
      "file_size": 1843200
    },
    "guitar": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
      "content_type": "image/jpeg",
      "file_name": "0-output.jpeg",
      "file_size": 1843200
    },
    "piano": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
      "content_type": "image/jpeg",
      "file_name": "0-output.jpeg",
      "file_size": 1843200
    }
  },
  "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.ru/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t",
    "cancel": "https://api.doitong.ru/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t/cancel"
  }
}
```

### Output fields (`output`)

| Field | Type | Description |
|---|---|---|
| `vocals` | object {url, content_type, file_name, file_size} \| null | ᡳᠰᡳᡥᠠᠨ ᡤᡳᠰᡠᠨ ᡳ ᡶᡳᠯᡝ᠉ |
| `drums` | object {url, content_type, file_name, file_size} \| null | ᡳᠰᡳᡥᠠᠨ ᡩᠷᠠᠮᠰ ᡳ ᡶᡳᠯᡝ᠉ |
| `bass` | object {url, content_type, file_name, file_size} \| null | ᡳᠰᡳᡥᠠᠨ ᠪᠠᠰᠰ ᡳ ᡶᡳᠯᡝ᠉ |
| `other` | object {url, content_type, file_name, file_size} \| null | ᡳᠰᡳᡥᠠᠨ ᡝᡵᡝ ᡳᠨᡠ ᡳ ᡶᡳᠯᡝ᠉ |
| `guitar` | object {url, content_type, file_name, file_size} \| null | ᡳᠰᡳᡥᠠᠨ guitar ᡳ ᡶᡳᠯᡝ᠂ 6s ᠮᠣᡩᡝᠯ ᡩᡝ ᡝᠮᡤᡳ ᠪᡳ᠉ |
| `piano` | object {url, content_type, file_name, file_size} \| null | ᡳᠰᡳᡥᠠᠨ piano ᡳ ᡶᡳᠯᡝ᠂ 6s ᠮᠣᡩᡝᠯ ᡩᡝ ᡝᠮᡤᡳ ᠪᡳ᠉ |

## Related models

- [MMAudio V2](https://doitong.com/developers/models/mmaudio-v2.md) (`mmaudio-v2`): $0.001 / second
- [Sam Audio · Separate](https://doitong.com/developers/models/sam-audio/separate.md) (`sam-audio/separate`): from $0.05 / 30 seconds of input audio
- [Sam Audio · Span Separate](https://doitong.com/developers/models/sam-audio/span-separate.md) (`sam-audio/span-separate`): from $0.05 / 30 seconds of input audio
- [DeepFilterNet 3](https://doitong.com/developers/models/deepfilternet3.md) (`deepfilternet3`): $0.001 / 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

## Links

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