CampaignReel

Ad placement specs against what generators output

Bumper ad: five to six seconds, unskippable

A bumper is a very short unskippable video ad, five to six seconds long, charged on impressions. There is no skip control and, on the pages that define it, no stated shape or resolution: the specification is a length and nothing else. As of 2026-09-12.

A format whose whole rule is a lengthNo skip control, no stated shape and no stated resolution. Whatever a tool produces in one call covers it, so the constraint moves entirely into the writing.What the format fixesWhat it leaves to othersLengthFive to six secondsNothingSkipNoneNothingShape and sizeNothingThe surface it runs onOne idea, one line, no reveal
Fig. 1 The easiest slot to produce for and the hardest to write, which is why it is the usual entry point.
What each page puts in writingFilled where the page states something in that column, hollow where it does not address it.What each page puts in writingWhat the format fixesWhat it leaves openLengthLength — What the format fixes: Five to six secondsLength — What it leaves open: Nothing; the range is the whole ruleSkipSkip — What the format fixes: NoneSkip — What it leaves open: NothingBillingBilling — What the format fixes: On impressionsBilling — What it leaves open: NothingShape and resolutionShape and resolution — What the format fixes: Not stated by the formatShape and resolution — What it leaves open: Decided by the surface it runs on
Fig. 2 Filled where the page states something in that column, hollow where it does not address it.
Bumper ad, as published. Recorded 2026-09-12.
PropertyWhat the format fixesWhat it leaves open
LengthFive to six secondsNothing; the range is the whole rule
SkipNoneNothing
BillingOn impressionsNothing
Shape and resolutionNot stated by the formatDecided by the surface it runs on

Inclusion rule. Properties the format definition itself fixes, separated from properties decided elsewhere. Placement-level requirements are recorded on the placement sheets. Order. The property that defines the format first.

1The format most generators already fit

Five to six seconds fits inside a single call on every tool that states a length in seconds, so a bumper is the one format where a tool imposes no constraint the format has not imposed already. There is no join, no continuity to hold and no assembly step to pay for.

That makes it the usual entry point for generated advertising. Whatever a tool can do in a single call, it can do here, which removes the whole class of problems a longer slot creates.

2The constraint moves to the writing

Six seconds is one idea and one line. There is no time for a reveal, because a viewer cannot be asked to wait for anything, so the brand has to be carried by the frame rather than by a structure.

No register helps with that. It is a creative limit, and the reason bumpers are harder to write well than a thirty second slot even though they are trivially easier to produce.

3Shape is decided by the media plan, not by the format

With no aspect ratio in the definition, the shape a bumper has to be is whatever the surface it runs on accepts. That is settled when the placement is bought rather than when the format is chosen.

It matters more at six seconds than at sixty. A short ad is usually one framing, and a framing generated for the wrong shape cannot be rescued by a crop without moving the subject, so the shape has to be right at the moment of generation.

A vocabulary entry: the definition, plus how the specification pages on these sheets usually publish it. Table checked 2026-09-12. Nearby entries: Non-skippable in-stream, Skippable in-stream.

4From brief to placement

For ad work around “Bumper ad”, SceneMixer's pages explain how its ad projects are produced:

A one-line skeleton: a shot marker and a few seconds, like [Shot 1] 3s: .

SceneMixer, Inserting and Deleting Segments — “What does the edit box open with on a blank segment?” (read 2026-10-13)

Episode 1 opens on the conflict within 5 seconds, establishes the lead's situation and what she wants, and ends on an identity hook.

SceneMixer, Vertical Short Drama Script Format (2026): Episode Length, Word Counts, Hook Structure and AI-Generation Constraints — “What has to happen in the first three episodes?” (read 2026-10-13)