POST/extend-video8 credits

Extend Video

Continue a video generated by /imagine-video with additional frames, extending the clip's duration. Specify which of the four video variants to extend (by index 1–4), a continuation prompt, and optionally a new start frame. Chain multiple extensions to build longer video sequences from a single original generation.

Request Parameters

Parameter	Type	Required	Description
parent_task_id	`string`	Required	Task ID of the original /imagine-video task.
index	`string`	Required	Which video from the parent task to extend. `1234`
prompt	`string`	Required	Prompt describing how the video should continue.
image_url	`string`	Optional	Optional start frame override for the extension.
motion	`string`	Optional	Amount of motion for the extension. "low" or "high".Default: `low` `lowhigh`
webhook_url	`string`	Optional	URL where we POST the completed task result.
webhook_secret	`string`	Optional	Sent as x-webhook-secret header in webhook delivery.

Example Request

cURL

curl -X POST https://api.journeyapi.com/api/v1/extend-video \
  -H "Authorization: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "parent_task_id": "jj4m2i44-m63p-85r8-o150-880099884444",
    "index": "1",
    "prompt": "the camera continues panning right, revealing a waterfall",
    "motion": "low",
    "webhook_url": "https://your-server.com/webhook"
  }'

Immediate Response

Returns immediately with a task ID. Use /fetch or webhooks to get the result.

200 OK

{
  "task_id": "kk5n3j55-n74q-96s9-p261-991100995555"
}

Response Fields

Field	Type	Description
task_id	`string`	UUID of the extend task.
task_type	`string`	Always "imagine-video-extend".
video_urls	`string[]`	Array of 4 extended video URLs.

Tips

1The extended video starts from the last frame of the selected parent video.
2Keep prompts consistent between the original and extension for visual continuity.

Quirks & Gotchas

Extended videos are independent clips, not appended to the original.

Related Endpoints

POST/imagine-video