Why “on-brand” breaks in AI video (and what to control first)

If you’re producing weekly Shorts/Reels, the fastest way to lose trust is style drift: one clip looks like clean studio product footage, the next looks like a moody indie film, then suddenly your brand colors vanish.

Even with stronger prompt adherence in Veo 3.1 (https://cloud.google.com/blog/products/ai-machine-learning/ultimate-prompting-guide-for-veo-3-1), “on-brand” breaks because teams describe scenes more than they define rules. The model fills gaps with plausible defaults: random wardrobe, different lenses, new lighting, inconsistent typography.

So control the identity levers first, then let the scene vary:

Hard visual locks: palette, lighting direction/contrast, lens + camera rules, aspect ratio, and “don’ts” (negative constraints).
Soft flavor: set dressing, micro-textures, motion energy, music vibe.

Veo 3.1 supports professional-grade creative controls and multiple aspect ratios (https://cloud.google.com/blog/products/ai-machine-learning/ultimate-prompting-guide-for-veo-3-1), and you can generate synchronous audio like dialogue/ambient/effects depending on your workflow (https://ltx.studio/blog/veo-prompt-guide). That makes consistency possible—if your prompting system is consistent too.

The 12-line Veo3Gen Style Bible template (copy/paste)

Paste this at the top of every prompt (or store it as a team snippet). Replace bracketed text.

1) BRAND ANCHOR: [brand/product + 5-10 word identity tagline]
2) FORMAT LOCK: [aspect ratio] | [duration] | [resolution target]
3) SUBJECT LOCK: [what must stay identical: product form, logo placement rules, materials]
4) COLOR PALETTE (HARD): [3-5 colors + “no other dominant colors”]
5) LIGHTING (HARD): [key direction, softness, contrast, time-of-day rules]
6) LENS & CAMERA (HARD): [lens mm range, camera height, movement rules, stabilization]
7) COMPOSITION RULES: [framing, headroom, negative space, safe zones for text]
8) MOTION LANGUAGE: [pace, transitions, allowed moves, “no handheld unless…”]
9) ENVIRONMENT STYLE (SOFT): [set dressing, era, textures, props, background complexity]
10) POST / COLOR SCIENCE (SOFT): [grade style, grain, halation, sharpness]
11) AUDIO STYLE (SOFT): [dialogue tone, ambient bed, SFX, “no music unless…”]
12) NEGATIVE CONSTRAINTS (HARD): [ban list: wardrobe, fonts, artifacts, extra logos, gore, etc.]

Hard locks vs soft flavor (how to think about it)

Hard locks (keep constant across every clip): Lines 2–6 and 12. These define what “on-brand” means visually and technically.
Usually hard (but can be project-specific): Line 3 and 4. If you’re marketing one hero product, keep them locked.
Soft flavor (can vary per scene while staying on-brand): Lines 7–11. These let you switch locations, moods, and story beats without changing your identity.

How to fill each line (with do/don’t examples)

1) Brand anchor

Do: “Vela Water Bottle — crisp, minimal, hydration for daily athletes.”

Don’t: “Cool product ad.” (Too vague; invites the model to invent a style.)

2) Format lock

Pick your platform first. Veo supports multiple aspect ratios (https://cloud.google.com/blog/products/ai-machine-learning/ultimate-prompting-guide-for-veo-3-1), and native vertical (9:16) is explicitly called out for Shorts-style platforms in the Ingredients-to-Video update (https://blog.google/innovation-and-ai/technology/ai/veo-3-1-ingredients-to-video/).

Do: “9:16 | 8 seconds | 1080p target.”

Don’t: “Make it social-ready.” (You’ll get random crops and inconsistent framing.)

4) Color palette (hard)

Write it like a design spec.

Do: “Palette: matte white, charcoal black, electric teal accents; backgrounds neutral; no warm orange dominance.”

Don’t: “Modern colors.”

6) Lens & camera (hard)

Most “style drift” is actually lens drift.

Do: “Lens 35–50mm look, eye-level camera, smooth gimbal; no ultra-wide distortion; no dutch angles.”

Don’t: “Cinematic camera.” (Cinematic can mean anything.)

12) Negative constraints (hard)

Use this to prevent the model from “helping.”

Do: “No extra brand marks, no fake UI overlays, no text watermarks, no warped logos, no random jewelry, no changing bottle cap color.”

Don’t: “No bad stuff.”

3 ready-made Style Bibles (UGC, clean SaaS, premium cinematic)

Copy one and adapt.

A) UGC creator (bright, friendly, repeatable)

Hard locks: bright soft daylight, consistent palette, minimal lens variation.

1) BRAND ANCHOR: Vela Bottle — friendly UGC that feels real and helpful
2) FORMAT LOCK: 9:16 | 6-8s | 1080p target
3) SUBJECT LOCK: same Vela bottle design, teal cap, logo always readable
4) COLOR PALETTE (HARD): white + teal + soft gray; avoid heavy neon colors
5) LIGHTING (HARD): soft window daylight, low contrast, no dramatic colored light
6) LENS & CAMERA (HARD): 24–35mm phone camera feel, stable handheld, no whip zoom
7) COMPOSITION RULES: centered subject, clean background, top third safe for captions
8) MOTION LANGUAGE: simple actions, 1–2 beats, no fast cuts
9) ENVIRONMENT STYLE (SOFT): kitchen/gym/desk, everyday props, tidy
10) POST / COLOR SCIENCE (SOFT): natural, slight warmth, minimal sharpening
11) AUDIO STYLE (SOFT): casual VO, light room tone, subtle SFX
12) NEGATIVE CONSTRAINTS (HARD): no glam makeup, no fashion wardrobe shifts, no clutter, no extra logos

B) Clean SaaS (product UI + minimalism)

1) BRAND ANCHOR: Vela App — calm, precise, modern SaaS clarity
2) FORMAT LOCK: 16:9 | 8s | 1080p target
3) SUBJECT LOCK: UI uses brand teal for primary, consistent icon style
4) COLOR PALETTE (HARD): white/gray base + teal accents; no saturated gradients
5) LIGHTING (HARD): soft studio, shadowless, high key
6) LENS & CAMERA (HARD): 35–50mm equivalent, locked-off tripod, slow push-in only
7) COMPOSITION RULES: generous negative space, UI centered, safe margins
8) MOTION LANGUAGE: smooth fades, gentle eases, no jitter
9) ENVIRONMENT STYLE (SOFT): abstract studio or clean desk, minimal props
10) POST / COLOR SCIENCE (SOFT): crisp, clean whites, no film grain
11) AUDIO STYLE (SOFT): subtle clicks/wooshes, no music unless specified
12) NEGATIVE CONSTRAINTS (HARD): no glitch effects, no neon, no handwritten fonts, no lens flares

C) Premium product cinematic (controlled drama without chaos)

1) BRAND ANCHOR: Vela Bottle — premium craft, precise details, quiet confidence
2) FORMAT LOCK: 9:16 | 8s | 1080p target
3) SUBJECT LOCK: same bottle proportions, teal cap, logo sharp and centered when visible
4) COLOR PALETTE (HARD): black/graphite + teal highlights; avoid warm tungsten dominance
5) LIGHTING (HARD): single soft key from camera-left, deep shadows, controlled specular highlights
6) LENS & CAMERA (HARD): 50–85mm look, slow dolly or slider, no handheld, no wide-angle
7) COMPOSITION RULES: hero framing, clean edges, room for end-card
8) MOTION LANGUAGE: slow, deliberate, 1 continuous move
9) ENVIRONMENT STYLE (SOFT): dark studio, subtle haze, minimal reflective surface
10) POST / COLOR SCIENCE (SOFT): rich contrast, slight bloom, fine grain
11) AUDIO STYLE (SOFT): subtle whoosh + soft room tone, no upbeat pop music
12) NEGATIVE CONSTRAINTS (HARD): no busy backgrounds, no extra props stealing focus, no jump cuts, no random wardrobe

How to attach a Style Bible to any scene prompt (2 proven structures)

Veo 3.1 is used across tools including Vertex AI (https://cloud.google.com/blog/products/ai-machine-learning/ultimate-prompting-guide-for-veo-3-1) and can be accessed via products like Gemini/Flow/Google Vids (https://www.dreamhost.com/blog/veo-3-1-prompt-guide/). Wherever you run it, keep the structure consistent.

Structure 1: Style Bible first, then scene

Use this when adherence is slipping.

Prompt pattern:

Paste the 12-line Style Bible
Add: “SCENE BRIEF:” with only the changing details

Structure 2: Scene first, then enforce locks

Use this when the story is complex.

Prompt pattern:

Start with a 2–3 sentence scene description
Add: “STYLE BIBLE (must follow):” and paste the 12 lines
End with: “If conflict, prioritize hard locks.”

Two examples: same product, 3 scenes, one Style Bible

Below are two mini-campaigns. In each, you reuse the same Style Bible and swap only the scene brief.

Example set #1 (UGC): Vela Bottle in 3 everyday scenes

Use Style Bible: UGC creator (Template A)

Scene 1 — Kitchen fill: “SCENE BRIEF: Morning kitchen. Creator hand fills Vela bottle at sink, quick smile to camera, show logo clearly for 1 second.”

Scene 2 — Gym bag grab: “SCENE BRIEF: Gym locker area. Hand grabs Vela bottle from bag, quick close-up of teal cap twist, subtle sweat towel in background.”

Scene 3 — Desk hydration reminder: “SCENE BRIEF: Clean desk workspace. Bottle beside laptop, creator taps bottle as reminder, end on centered product.”

Example set #2 (Premium cinematic): Vela Bottle in 3 hero moments

Use Style Bible: Premium product cinematic (Template C)

Scene 1 — Macro condensation: “SCENE BRIEF: Extreme close-up of condensation beads rolling down bottle; slow slider move; logo enters frame near the end.”

Scene 2 — Cap twist highlight: “SCENE BRIEF: Close-up. Teal cap rotates slowly with crisp specular highlight; bottle stays centered; no extra props.”

Scene 3 — End-card hold: “SCENE BRIEF: Bottle on dark reflective surface. Slow push-in. Leave clean negative space top third for text overlay.”

Image-to-video: reconciling reference images with your Style Bible

Veo 3.1 improves audiovisual quality when turning images into videos (https://cloud.google.com/blog/products/ai-machine-learning/ultimate-prompting-guide-for-veo-3-1), and workflows like Image-to-Video plus Start/End Frame are commonly described as creative controls (https://ltx.studio/blog/veo-prompt-guide). The practical issue: your reference image may conflict with your “hard locks.”

Use a simple conflict rule:

Default: “Respect the reference image for subject identity and composition.”
Override only if specified: Allow Style Bible to override lighting or color grade only when the reference is off-brand.

Add a line to your prompt right after the Style Bible:

“REFERENCE PRIORITY: Keep product geometry/logo as in reference. Match Style Bible palette + lighting unless it breaks subject realism.”

If you’re using first/last frame workflows, note that “first frame, last frame” is called out as a capability teams are using for controlled transitions (https://cloud.google.com/blog/products/ai-machine-learning/ultimate-prompting-guide-for-veo-3-1). In practice, that’s another place to keep Line 2 (format) and Lines 4–6 (locks) consistent.

Quick fixes: when your Style Bible gets ignored (adherence checklist)

Use this checklist when outputs start wandering.

Adherence checklist (fast)

Palette drift: Did you list only 3–5 colors and ban other dominant hues in Line 4?
Random wardrobe/props: Did you explicitly ban them in Line 12?
Lens/camera inconsistency: Did you specify mm range + movement rules in Line 6?
Aspect ratio/format shifts: Is Line 2 explicit (e.g., 9:16) and repeated in the scene brief?
Typography or UI chaos: Did you reserve safe zones (Line 7) and ban unwanted fonts/overlays (Line 12)?

Mini workflow for teams: store, version, and update monthly (as of 2026-03-14)

Small teams move faster when the Style Bible is treated like a living asset.

Versioning rules

Name it: Brand-Project-Platform-vX.Y (example: Vela-Launch-Shorts-v1.2).
Lock changes to hard lines (2–6, 12) behind a quick review.

Monthly update cadence

Week 1: review the last 10 clips; note recurring failure modes.
Week 2: update negatives (Line 12) and composition safe zones (Line 7).
Week 3: create 3 “approved scene briefs” that anyone can remix.
Week 4: archive old versions; keep one current default.

FAQ

Does Veo 3.1 support vertical video for Shorts/Reels?

Native vertical (9:16) is supported in the Veo 3.1 Ingredients-to-Video update aimed at platforms like YouTube Shorts (https://blog.google/innovation-and-ai/technology/ai/veo-3-1-ingredients-to-video/).

What’s the single most important “hard lock” line?

Line 6 (Lens & Camera) plus Line 4 (Palette). Those two prevent most “it looks like a different brand” moments.

Should I put audio in the Style Bible?

Yes, but treat it as soft flavor unless your brand has strict voice rules. Integrated audio can include synchronized dialogue, ambient sound, and effects depending on the workflow (https://ltx.studio/blog/veo-prompt-guide).

Can I use start/end frames with this template?

Yes—Start/End Frame is described as an advanced creative control for controlled transitions (https://ltx.studio/blog/veo-prompt-guide), and first/last frame is highlighted as transformative for teams using Veo 3.1 (https://cloud.google.com/blog/products/ai-machine-learning/ultimate-prompting-guide-for-veo-3-1).

CTA: put your Style Bible on autopilot with Veo3Gen

If you’re ready to standardize prompts across a team (and reuse the same Style Bible across tools and campaigns), Veo3Gen can help you operationalize it.

Explore the developer workflow in our API docs: /api
See plans and usage options: /pricing

Copy the 12-line template, mark your hard locks, and you’ll spend less time fighting drift—and more time shipping clips that look like they belong together.

Try Veo3Gen (Affordable Veo 3.1 Access)

If you want to turn these tips into real clips today, try Veo3Gen:

Start generating via the API: /api
See plans and pricing: /pricing

Veo 3.1 Prompting “Style Bible” (2026): A Reusable 12-Line Template to Keep Every Clip On‑Brand