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POST
/
kling
/
v1
/
videos
/
video-extend
Video Extension
curl --request POST \
  --url https://api.cometapi.com/kling/v1/videos/video-extend \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "video_id": "example"
}
'
{
  "code": 123,
  "message": "<string>",
  "request_id": "<string>",
  "data": {
    "task_id": "<string>",
    "task_status": "<string>",
    "task_status_msg": "<string>",
    "task_info": {
      "parent_video": {
        "id": "<string>",
        "url": "<string>",
        "duration": "<string>"
      }
    },
    "task_result": {
      "videos": [
        {
          "id": "<string>",
          "url": "<string>",
          "duration": "<string>"
        }
      ]
    },
    "created_at": 123,
    "updated_at": 123
  }
}
Use this endpoint to extend an existing Kling video as a follow-up task.

​
Before you call it

  • Start from a finished Kling video result
  • Pass the video_id from the parent task result
  • Run the extension on the same account context as the parent task
  • Trigger the extension promptly before parent-task resources expire

​
Task flow

1

Finish the parent video task

Create the original Kling video and wait until its result is available.
2

Submit the extension request

Send the video_id and optional prompt, then save the returned task id.
3

Poll the extension task

Continue with Individual Queries until the extended video reaches a terminal state.
For the complete parameter reference, see the official Kling documentation.

Authorizations

​
Authorization
string
header
required

Bearer token authentication. Use your CometAPI key.

Body

application/json
​
video_id
string
default:example
required

Video id from a previously generated Kling video task to extend.

​
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.

Response

200 - application/json

Successful Response

​
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