Why a Segment Was Split Into Two, and What the ‘Continues From the Previous Segment’ Note Means

Quick answer: A segment is one video generation, and a generation has a maximum length (15 or 30 seconds by tier). When the storyboard writes a segment whose shots add up to more, the site first shortens non-dialogue shots; if it still does not fit, the segment is cut into two at a shot boundary, as evenly as possible, never between a shot and the one that continues it. The second piece gets its own header: its opening state describes its first shot, and carries a note that it continues from the previous segment, so the clip starts where the last one stopped. Props are listed per piece. Each piece is priced and generated on its own. They cannot be merged back into one segment; if you want a single clip, shorten the shots until they fit.

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 split pair: the second segment’s header opens with the continues note and its first shot; the first segment ends at the shot before it.

Why a segment is split

Segment length is decided in Step 3 (15 or 30 seconds); the storyboard aims at it but a dense passage can overshoot. Rather than fail the whole episode, the site cuts the segment: shots are kept whole, and the cut goes where the two halves are most even. Only a single shot longer than the cap by itself is a failure. 15 or 30 Second Segments.

The episode timeline: every segment as a card with its thumbnail and duration — A segment longer than one generation allows is cut at a shot boundary; the second piece opens with a 'continues' note.

What the second piece looks like

Its header is rebuilt for its own first shot: the shot size, who is in frame, what is on screen; and a note that it continues from the previous segment. Its shots are numbered from 1 again. The two pieces are generated separately, like any two segments; the second follows on from the first through that header. Why the Next Segment Opens Like the Last One Ended.

Price and generation

Two segments, two generations, each priced by its own length. The total is close to what one long segment would have cost, since video is priced per second; the only difference comes from each piece being rounded up to whole seconds and to the 4-second minimum. Changing Segment Duration.

Merging back

Not offered: a merged segment would again exceed the cap. To get one clip, edit the shots so their seconds fit the segment length, then delete the second piece. Or accept the pair; a cut at a shot boundary is a normal edit point.

Ad segments are fixed at 15 seconds and their shots are scaled to fit instead of split; a split never happens in an ad.

Situation	Result
Shots add up to slightly over the cap	Non-dialogue shots shortened; no split
Still over after shortening	Split at the most even shot boundary
A shot continues the previous one	Kept together across the cut
One shot alone exceeds the cap	Task fails; edit the shot
Ad segment	Scaled, never split

FAQ

Why was I not asked before the split?

The alternative was failing the storyboard; the split keeps everything you wrote.

Can I move the cut?

Yes: edit the two segments' shots, or insert and delete segments by hand.

Does the second piece know the scene?

Yes. Its header carries the location, time and props for its own shots.

Does the split cost extra?

Each piece is priced by length; the sum is about the same as one long generation.

Why does the second clip open on the same framing as the first one ended?

Its header describes where the first piece left off. Edit its first shot to open on a different framing, then regenerate it.

Two pieces, one scene

The cut lands on a shot boundary and the second piece knows where it starts.

Open the editor

Updated October 2, 2026