Compositing: joining pieces into one deliverable
Compositing is the step that turns several generated pieces into one deliverable. Where a page documents it, the joining work sits inside the product and often inside the invoice. Where it does not, the work happens in an editor. As of 2026-09-12.
| Where the step happens | Who owns the seams | What is published |
|---|---|---|
| Inside the tool | The vendor | Sometimes a rate per second of output |
| Inside one request | The model | A length, with the cuts unplaceable |
| In an editor | The production team | Nothing; it is outside the page |
Inclusion rule. Arrangements a page can describe for assembling pieces. No claim is made about how any resulting join looks. Order. Most explicit arrangement first.
1A documented step moves the work, not the difficulty
Where assembly is named and priced, a buyer knows who does it and what it costs. That is worth having. It does not say whether a face and a key light survive the seam, and no page in this genre publishes anything about that.
So a documented compositing step is a scheduling fact rather than a quality claim. It tells a plan where the work sits and leaves the creative risk exactly where it was.
2Assembly inside one request takes the cut points away
Where a single call returns a sequence already cut, the joining has been done and so has the decision about where each beat ends. For an advertisement with a fixed beat at the close, that decision belonged to the brief.
Fewer seams and less control arrive together. Only the first of the two appears in a length column, which is why the unit a ceiling applies to matters as much as the figure.
3The editor's version buys precision
Joining separately generated pieces by hand means every seam has to be hidden, and it also means the cut sits exactly where the edit wants it, on the least demanding moment available.
For a short advertisement that is usually worth the trouble. The cut can be placed on a wide shot, on a movement, or on a moment with no face in frame, and none of those choices exists when the cuts arrive pre-made.
A vocabulary entry: the definition, plus how the specification pages on these sheets usually publish it. Table checked 2026-09-12. Nearby entries: Spark ad, Frame rate.
4A generator's ad pipeline
For ad work around “Compositing”, SceneMixer's pages explain how its ad projects are produced:
Paste a scene or a short script and SceneMixer gives you a storyboard — numbered shots with framing and seconds — and then a moving version of each segment, which you can join into a rough cut of the scene.
SceneMixer, Using SceneMixer for Previs and Animatics Before a Live-Action Shoot (read 2026-10-13)
AI Edit Image on a step-2 card keeps the same character and applies a short change you describe — navy blue shirt, short curly hair, smiling — then Apply Edit.
SceneMixer, AI-Editing a Sheet: Outfit, Hair, Expression (read 2026-10-13)