Seedance 2.5 Video Extend

Video Models

Overview

Extend an existing video with Seedance 2.5. The new segment is returned on its own, 4 to 30 seconds long, at 480p, 720p or 1080p. Continue starts from the source video's final frame; Prepend instead builds up to its first frame. The output aspect ratio always follows the source video and cannot be set. Both the source video's full length and the new segment are billed, so extending a longer source costs more.