---
title: "Insert audio on timeline"
method: POST
path: "/projects/{projectId}/timeline/audio"
tags: ["Timeline Editing"]
---

# Insert audio on timeline

`POST /projects/{projectId}/timeline/audio`

## Request

- Base URL: `https://blitzreels.com/api/v1`
- URL: `https://blitzreels.com/api/v1/projects/{projectId}/timeline/audio`
- Auth: API key in header `Authorization`

Insert audio on timeline.

## Path parameters

- `projectId` string, required

## Request body

- object
  - `items` object[], required
    - `asset_id` string, uuid, required
    - `start_seconds` number, required
    - `duration_seconds` number
    - `volume` number
    - `fade_in_seconds` number
    - `fade_out_seconds` number
    - `loop` boolean

## Response `200`

Successful response

- object
  - `inserted` object[], required
    - `asset_id` string, required
    - `timeline_item_id` string, nullable, required
    - `start_seconds` number, required
    - `duration_seconds` number, required
    - `volume` number, required
    - `fade_in_seconds` number, required
    - `fade_out_seconds` number, required
    - `loop` boolean, required
    - `success` boolean, required
    - `message` string, nullable, required
  - `summary` object, required
    - `total` number, required
    - `inserted` number, required
    - `failed` number, required
  - `txid` number, nullable, required

## Other responses

- `400`: Invalid input data
- `401`: Authorization not provided
- `403`: Insufficient access
- `500`: Internal server error

---

[API](https://skmtc.dev/blitzreels/apis/blitzreels-api.md) · [All operations](https://skmtc.dev/blitzreels/apis/blitzreels-api/llms.txt) · [OpenAPI document](https://skmtc.dev/blitzreels/apis/blitzreels-api/revisions/35608b12471d?raw)