Inserting and Deleting Segments

Quick answer: On a segment’s card, Insert segment after adds a blank segment right after it: write its header and shots, then generate. Delete segment removes the segment, its video and its version history — credits already spent on it are not refunded, and you are asked to confirm. Neither action costs anything. A segment whose video is generating cannot be deleted, and an episode always keeps at least one segment.

Still from “Rocket Pup”, an AI short drama generated end-to-end by SceneMixer (7 characters, 1 episode) — Sample: “Rocket Pup” — Feature 3D Animation, 1 episode, produced end-to-end by SceneMixer from the script · watch the episodes

Open a finished episode and look at the timeline. Each card is a segment; the controls are on the card.

Inserting a segment

Select the segment you want the new one to follow and choose Insert segment after. A blank card appears after it, and the editor says: blank segment inserted, write its script, then generate. Numbering shifts to make room.

A blank segment has no header and no shots, so nothing can be generated from it yet. Write the header — Location, Time, Weather, Opening frame, Set dressing, Props — and the shots, the same way the segments around it are written. Its Opening frame should describe where the previous segment left off. The header · Writing a shot.

The episode timeline: every segment as a card with its thumbnail and duration — The episode timeline. Inserting adds a card after the one you chose; deleting removes a card and its video.

Splitting a segment that is too long

The usual reason to insert. When a segment’s shots add up past the tier’s cap, insert a segment after it, cut the last shots from the long one and paste them into the new one, then give the new one a header. Both segments are now within the cap, and each is generated and priced on its own. Shot seconds and the cap.

Deleting a segment

Choose Delete segment on its card. The confirmation says exactly what goes: Delete segment N? Its generated video and version history will be removed; credits already spent are not refunded. Confirm and the card is gone, along with every version of its video. The text is gone too, so copy anything you want to keep first.

Two things stop a deletion. A segment whose video is still generating: wait for it to finish or stop it first. And the last segment of an episode: at least one segment must remain.

What happens around it

Other segments are untouched. The episode’s composite, if you made one, is untouched too; it is a separate file. Composite again to get a new file without the deleted segment. Numbering closes up.

Inserting versus regenerating the storyboard

Inserting and deleting are surgical: one segment, free, nothing else moves. Regenerating the episode’s storyboard rewrites every segment and discards their videos. When the breakdown is mostly right, insert and delete; when it is wrong throughout, regenerate. What regenerating the storyboard costs you.

Action	Cost	Removes	Blocked when
Insert segment after	Free	Nothing	—
Delete segment	Free (spent credits not refunded)	Text, video, version history of that segment	Its video is generating; it is the last segment
Regenerate storyboard	One storyboard fee	Every segment’s text and video	Any segment is generating

FAQ

Does inserting a segment cost credits?

No. Neither does deleting. Only generating video is charged.

Why can't I delete this segment?

Either its video is still generating — wait or stop it — or it is the only segment left.

Do I get credits back when I delete a segment with a video?

No. Credits already spent on that video are not refunded; the confirmation says so.

Where does a new segment get its header?

You write it. Copy the previous segment's header as a starting point and change what differs.

Does deleting a segment change my composite?

No. The composite is a separate file. Composite again to rebuild it without the segment.

Split one long segment

Insert a segment after it, move the last shots across, and generate both.

Open the editor

Updated September 26, 2026