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Extend AI Video

POST 
/api/v1/runway/extend

Extend existing AI-generated videos to create longer sequences.

Usage Guide​

  • Add additional segments to your AI-generated videos
  • Maintain visual consistency while extending narratives
  • Create longer sequences for storytelling or demonstrations

Parameter Details​

  • taskId identifies the original video to extend
  • prompt guides how the video should continue
  • imageUrl specifies which frame to continue from
  • expandPrompt enables AI optimization of your description
  • waterMark video watermark text content, empty string means no watermark

Developer Notes​

  • Extended videos are stored for 14 days before automatic deletion
  • Extension maintains the same aspect ratio as the original video
  • Extension works best when continuing the same subject/theme as the original video
  • This endpoint only supports videos generated by runway-duration-5-generate and runway-duration-10-generate models
  • This endpoint does not support videos generated by runway-gen4-turbo-duration-5-generate and runway-gen4-turbo-duration-10-generate models

Request​

Responses​

Request successful

Callbacks​

POST 
{$request.body#/callBackUrl}

When video extension is complete, the system will send a POST request to the provided callback URL to notify the result

Callbacks Responses​

Callback received successfully