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Runway Gen4 (Kie.ai)

Generate and extend videos using Runway Gen4 via Kie.ai API

Actions5

Extend

AI-generated

Summary

Extend the duration of an existing video task by specifying the Task ID and number of seconds to add.

Inputs

  • extendTaskId (required) — Task ID of the video to extend
  • seconds — Number of seconds to extend (default is 5)
  • replyUrl — Webhook URL to call when the task completes
  • replyRef — Custom reference string passed back in the webhook callback
  • captchaToken — reCAPTCHA token if required by the API
  • waitForCompletion — Whether to wait for the task to complete (polls every 3s up to 5 minutes, default true)

Output shape

a JSON object with task details, including the updated task status and potentially the extended video URLs

If 'Wait for Completion' is enabled, the node polls the API until the extend task finishes (success or fail) or times out after 5 minutes. Otherwise, it returns the immediate API response. Errors are thrown if the extension fails or times out.

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