Extract a clip’s final frame as an image, so the next shot can start where it ended.
Chaining shots this way is what turns separate clips into one continuous take:
animate a start frame, take the last frame of the result, animate that. Without it
a caller would have to download the video, run ffmpeg itself and upload the frame
back, which a remote agent cannot do at all.
The frame is cataloged like an upload, so it appears in the gallery and can be
passed straight back as image — or edited first, if the next shot needs a change
that motion alone can’t make.