Infill (Replace Section) - MusicMint - AI Music API

Endpoint

POST /api/v1/music/infill

Asynchronous. Returns a task_id. Poll Get Task for results. Replaces a specified time range within an existing clip with new AI-generated content while keeping the rest of the track intact. Useful for fixing or improving a specific section.

Request body

Field	Type	Required	Description
`clip_id`	string	Yes	Clip ID of the source track.
`infill_start_s`	float	Yes	Start time (seconds) of the section to replace.
`infill_end_s`	float	Yes	End time (seconds) of the section to replace.
`prompt`	string	No	Description or lyrics for the replacement section. Supports Chinese and English.
`tags`	string	No	Style tags (e.g. `"摇滚吉他"` or `"rock guitar"`).
`mv`	string	No	Model version override.
`callback_url`	string	No	Webhook URL for completion notification. See Webhooks.
`retention_days`	integer	No	Days to retain audio files. Default `7`.

Response

{
  "code": 0,
  "message": "ok",
  "request_id": "req-1710000000000",
  "data": {
    "task_id": "64f3a1b2c8d9e0f1a2b3c4d5",
    "status": "queuing"
  }
}

Example

curl -X POST https://api.example.com/api/v1/music/infill \
  -H "Authorization: Bearer sk-mm-your-key" \
  -H "Content-Type: application/json" \
  -d '{
    "clip_id": "abc123def456",
    "infill_start_s": 45.0,
    "infill_end_s": 60.0,
    "prompt": "[桥段]\n电吉他独奏，充满力量",
    "tags": "摇滚 吉他独奏"
  }'