---
title: "Video Extension"
method: POST
path: "/kling/v1/videos/video-extend"
---

# Video Extension

`POST /kling/v1/videos/video-extend`

Only videos from supported generation types can be extended.

## Request body

- object
  - `task_id` string, required — Parent Kling task id for the extension-compatible video being extended.
  - `video_id` string, required — Video id from a parent task result. The source video must be extension-compatible; unsupported videos return HTTP 400.
  - `prompt` string — Text prompt describing the desired motion for the extended segment. Maximum 500 characters.
  - `callback_url` string — Webhook URL to receive task status updates when the task completes.
  - `negative_prompt` string — Elements to avoid in the extension.
  - `cfg_scale` number — Prompt adherence strength for the extension. Range: 0-1.

## Response `200`

Successful Response

- object
  - `code` integer, required — Error code; specifically define the error code
  - `message` string, required — error message
  - `request_id` string, required — Request ID, system-generated, for tracking requests, troubleshooting issues
  - `data` object, required
    - `task_id` string, required — Task ID, system generated
    - `task_status` string, required — Task status, enumerated values: submitted, processing, succeed, failed.
    - `task_status_msg` string, required
    - `task_info` object, required
      - `parent_video` object, required
        - `id` string, required
        - `url` string, required
        - `duration` string, required
    - `task_result` object, required
      - `videos` object[], required
        - `id` string
        - `url` string
        - `duration` string
    - `created_at` integer, required — Task creation time, Unix timestamp, in ms.
    - `updated_at` integer, required — Task update time, Unix timestamp, in ms.

---

[API](https://skmtc.net/cometapi/apis/create-api-key.md) · [All operations](https://skmtc.net/cometapi/apis/create-api-key/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/cometapi/create-api-key/versions/0863102dbf34/schema)