Recast, Omni edit, Genjutsu or a new shot: which ad variant method?
Four ways to make an ad variant on Sume, limits side by side: Recast swaps people, Omni edit changes by prompt, Genjutsu moves motion, a new shot starts over.
You have a winning video ad and need a variant: another face, another product, another market. Sume has four ways to get one, and they differ in what they keep, what they need and how long a clip can be.
The limits below are from Sume's Video Router docs and fal's Recast page, read 2026-10-04.
The four methods
| Method | Changes | Inputs | Length |
|---|---|---|---|
| h3-max-recast | The people; keeps motion, camera, cuts, sound | Video plus 1 to 4 photos | 5 to 30 s, no shot over 15 s |
| gemini-omni-flash-1.1 edit | Anything you can describe in a prompt | video_url plus prompt, no references | 3 to 10 s |
| Genjutsu motion transfer | Who moves, using the motion of a source | video_url plus 1 to 8 images | 4 to 30 s, 480p or 720p |
| New shot (sume/auto) | Everything | Prompt, optional references | Per model |
Choosing
- Same scene, different person: Recast. At the default 768p it costs $0.375 a second on Sume, so a 12 second variant is $4.50.
- Same scene, different product or colour, clip under 10 seconds: Omni edit, with the change in the prompt.
- Different person doing a given move: Genjutsu, when your workspace has it configured, since it appears in the catalog only then.
- Different story or format: a new shot, with the old clip as inspiration only.
Practicalities
Recast is explicit: Sume's Auto routing never picks it, so you must send the model id h3-max-recast. Check the catalog for what your workspace can use. Combine methods when you need both a new person and a new product: swap the person first, then the product.
Whichever method you pick, inspect the result with stills before you ship, and keep the job id with the source clip and the signed release for any person shown.
Sources
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Written by Sume