CampaignReel

Ad placement specs against what generators output

Nova Reel gives exact pixels and never names a shape

Six of the fifteen entries in this register say nothing about output shape. This one is the reason the column is worth a page anyway: it publishes an exact pixel resolution, which answers the shape question by arithmetic, and still never states a ratio. As of 2026-09-22.

Pixels answer one question, not the otherA single pixel pair says what one output looks like. It cannot say whether the parameter accepts another value, and a placement plan needs the second answer.What 1280x720 settlesWhat it leaves openHow large is the outputExactlyNothingWhat shape is this outputBy arithmeticWhether the page authorised theconversionCan a vertical be orderedNot at allThe question a brief actually asksFive other silences here are ordinary; this page is otherwise precise
Fig. 1 Writing a derived ratio into the cell would make this row look like the pages that state a vertical output exists.
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 page answersWhat this register recordsWhat this registerrecordsHow large is the outputHow large is the output — What the page answers: 1280x720How large is the output — What this register records: Recorded as publishedWhat shape is the outputWhat shape is the output — What the page answers: NothingWhat shape is the output — What this register records: Not statedIs a vertical output availableIs a vertical output available — What the page answers: NothingIs a vertical output available — What this register records: Not stated, and not inferable from one pair
Fig. 2 Filled where the page states something in that column, hollow where it does not address it.
What the page gives, and what the register declines to derive. Recorded 2026-09-22.
QuestionWhat the page answersWhat this register records
How large is the output1280x720Recorded as published
What shape is the outputNothingNot stated
Is a vertical output availableNothingNot stated, and not inferable from one pair

Inclusion rule. What this user guide states against the two questions the shape column asks. An arithmetic consequence of a published figure is not recorded as a published figure. Order. The question the page answers first.

1Why a derived ratio does not go in the cell

1280 by 720 is sixteen by nine. Writing that in the shape column would make this row look like the four entries that publish two or more shapes, and it would be wrong in the way that matters: those pages say a vertical output exists and this one does not.

A single pixel pair says what one output looks like. It cannot say whether the parameter accepts another value, and a placement plan needs the second answer. The hollow cell is the honest record of that gap.

2The consequence is that vertical cannot be planned from this page

Most short-form advertising runs vertical. A page that names one widescreen resolution and no shape parameter gives a buyer nothing to book a vertical placement against, whatever the product may be capable of.

That is a sharper limitation than a missing tier. Resolution can be revisited after a render and shape cannot, so an unanswered shape question blocks the brief rather than the delivery.

3The other five silences are ordinary; this one is not

Two of the other silent rows are priced pages that print resolutions and nothing else. Two are model cards describing research releases. One is a rate card with a 4K tier. In each case the whole page is thin on output specifics, and the shape gap is part of that.

Here the page is otherwise precise: one resolution, one frame rate, a length rule and a model identifier condition. The shape column is the single question it leaves open, which is why the register gives this silence a page and leaves the other five as marked cells in a chart.

4Where this cell sits in the column

Aspect ratio, generator by generatorWhat each generator says about shape, Amazon Nova Reel marked. Hollow means the page addresses it nowhere. Recorded 2026-09-22.Aspect ratio, generator by generatorAspect ratioAmazon Nova Reel — Aspect ratio: Not statedAmazon Nova ReelCogVideoX — Aspect ratio: Not statedCogVideoXGoogle Veo — Aspect ratio: 16:9 and 9:16Google VeoGrok Imagine — Aspect ratio: Seven, 16:9 the defaultGrok ImagineHedra — Aspect ratio: Seven, including 9:21 and 21:9HedraHeyGen — Aspect ratio: 16:9 or 9:16HeyGenKling AI — Aspect ratio: Not statedKling AILTX-Video — Aspect ratio: Not statedLTX-VideoMiniMax — Aspect ratio: Six, required for text-to-videoMiniMaxPika — Aspect ratio: Not statedPikaPixVerse — Aspect ratio: Eight on version 6PixVerseRunway — Aspect ratio: Seven pixel pairsRunwaySceneMixer — Aspect ratio: 9:16 and 16:9SceneMixerVidu — Aspect ratio: Not statedViduWan 3.0 — Aspect ratio: Six, adaptive by defaultWan 3.0
Fig. 3 What each generator says about shape, Amazon Nova Reel marked. Hollow means the page addresses it nowhere. Recorded 2026-09-22.
Every generator in the register on the aspect ratio column, with Amazon Nova Reel marked. Recorded 2026-09-22.
GeneratorAspect ratio
Amazon Nova ReelNot stated
CogVideoXNot stated
Google Veo16:9 and 9:16
Grok ImagineSeven, 16:9 the default
HedraSeven, including 9:21 and 21:9
HeyGen16:9 or 9:16
Kling AINot stated
LTX-VideoNot stated
MiniMaxSix, required for text-to-video
PikaNot stated
PixVerseEight on version 6
RunwaySeven pixel pairs
SceneMixer9:16 and 16:9
ViduNot stated
Wan 3.0Six, adaptive by default

Inclusion rule. Every generator in the register, carrying whatever its own page says about output shape. Six rows say nothing and are marked hollow rather than dropped. Order. Alphabetical by generator name.

5Sources

Read from the Amazon Nova user guide, checked 2026-09-22. The column itself is described on aspect ratio, and the rule that keeps surfaces and generators apart is on method. Next along this column: TikTok, SceneMixer.