Extend a video by generating continuation content. This is an asynchronous operation that returns a request_id for polling.

Output destination for generated video.

Configuration for storing generation output in the Files API. When provided in a generation request, the output is stored as a permanent file and a file_output reference is included in the response.

Video input for editing and extension requests. Accepts a public URL, a base64-encoded data URL, or a file_id from the xAI Files API.