Extending a video
Add 4–15 seconds to a finished clip.
Any finished video can be continued. The end of the existing clip is sent to the model as a reference, and it renders what comes next.
An extension returns only the new seconds — it is a separate video, not a longer version of the original. Both stay in your library.
An extension costs a little more per second than a fresh render of the same length, because the provider bills the reference footage as input. The price shown before you confirm already includes that.