> ## Documentation Index
> Fetch the complete documentation index at: https://docs.musicmint.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Concat

> Merge a clipped segment back into a full-length song

## Endpoint

```http theme={null}
POST /api/v1/music/concat
```

**Synchronous** (blocking). Submits a concat job and waits for completion (up to 5 minutes). Returns the finished track.

Takes an existing clip and reconstructs the full-length version of the song it originated from.

## Request body

| Field     | Type   | Required | Description                       |
| --------- | ------ | -------- | --------------------------------- |
| `clip_id` | string | **Yes**  | Clip ID of the segment to concat. |

## Response

```json theme={null}
{
  "code": 0,
  "message": "ok",
  "request_id": "req-1710000000000",
  "data": {
    "id": "abc123def456",
    "status": 20,
    "audioUrl": "https://cdn.example.com/audio/abc123def456.mp3",
    "cld2AudioUrl": "https://cdn.example.com/audio/abc123def456_full.mp3",
    "duration": 180
  }
}
```

| Field          | Type    | Description                                 |
| -------------- | ------- | ------------------------------------------- |
| `id`           | string  | Clip ID of the resulting full-length track. |
| `cld2AudioUrl` | string  | URL of the full-length audio.               |
| `duration`     | integer | Audio duration in seconds.                  |

<Note>
  This endpoint blocks the HTTP connection for up to 5 minutes while waiting for the concat job to finish. Ensure your client and any proxies have a sufficiently long timeout (≥ 300 seconds).
</Note>

## Example

```bash theme={null}
curl -X POST https://api.example.com/api/v1/music/concat \
  -H "Authorization: Bearer sk-mm-your-key" \
  -H "Content-Type: application/json" \
  --max-time 600 \
  -d '{
    "clip_id": "abc123def456"
  }'
```