Which entries publish a shortest request
Ceilings get the attention because they decide how many calls a slot takes. Four entries also publish a floor: one second, two seconds, four and five. In short-form advertising, which is mostly small requests, the floor is the figure that binds. As of 2026-09-22.
| Item | What is published | Detail |
|---|---|---|
| One second | The lowest floor published here | Any whole value upward, with no condition |
| Two seconds | An integer range to thirty | Input plus output share the thirty second budget |
| Four and five seconds | Two models on one page | Four is unsupported on the second of them |
Inclusion rule. Entries whose own page states a minimum as well as a maximum length. A fixed single length is not a floor and is recorded separately. Order. Lowest floor first.
1A floor decides what a join can be made of
Joining two longer pieces often needs a beat rather than a shot. Generating that beat at its real length costs less than generating five seconds and discarding four, and on some rows the short version is not available at all.
That is why the one second floor is worth recording. It makes inserts their own request rather than trims from something larger, and it is the only entry in this register that goes that low.
2One second at the floor can matter more than five at the ceiling
Between two entries with the same fifteen second ceiling, a four second floor and a five second floor produce different shot lists. A four second cutaway exists on one and has to be bought at five and trimmed on the other.
Both of those are on one page, documenting two models from one vendor. A register carrying one line per vendor would have lost the difference entirely.
3Fixed lengths are not floors
Two entries publish a single value: six seconds in both cases. That is not a minimum, because nothing shorter is on offer and nothing longer is either, and these sheets record it as a fixed format rather than as a range with matching ends.
The distinction changes what a plan can do. A range with a low floor can absorb an awkward beat; a fixed value makes the beat fit the number, and the arithmetic against a slot is exact in a way that leaves nothing to negotiate.
- Duration parameterThe allowed range is 1-15 seconds
- Durations4-15 seconds on MiniMax-H3, and 5-15 on H3-Max where 4 seconds is not supportedstated per model
- Duration parameterAn integer in the range [2, 30] seconds, and input plus output must not exceed 30 seconds
- Gen-4.5Durations are 5-15 seconds on Gen-4.5, for text-to-video and image-to-video alikestated per endpoint
4Making the ad itself
For ad work around “Floors, not just ceilings”, SceneMixer's pages explain how its ad projects are produced:
An AI short drama is a serialized show of 60–120 second vertical episodes whose cast, sets and footage are generated by AI. Making one takes six steps: analyze the script into episodes, lock a consistent cast with reference art, localize for your market, write and edit storyboards, generate each 4–15 second shot, then composite and publish.
SceneMixer, How to Make an AI Short Drama, Step by Step (read 2026-10-13)
The final cut ends on an end card: your main image plus four lines — Brand, Product name, Tagline, Call to action. The first two are read from your photo and your brief; the tagline and call to action are written with the script.
SceneMixer, The End Card (read 2026-10-13)
5Sources
Format requirements come from Google Ads Help, read 2026-09-12, and tool limits from each vendor page listed on published limits, read 2026-09-22. The rule against mixing the two is on method. Nearby: Length in frames, Single values, Published defaults.