How to Make a Trailer for a Game, Book or Film With AI

You’ve finished a rough cut of your indie game. Or you’ve got a book draft you’re proud of. Or a short film that finally feels right.

You upload a rough trailer to friends and… nothing. The pacing is off, the shots feel random, and it doesn’t really say what your story is about. Now you’re staring at a blank “new project” in an AI trailer maker and wondering:

What do I actually ask it to make? How do I get consistent characters? How do I avoid paying for a bunch of broken shots I’ll never use?

Let’s walk through a concrete, end‑to‑end process using one example, and I’ll show you exactly how to think, plan and execute a trailer with AI.

Our example: “Fox and the Glowing Acorn” teaser

We’ll carry this one example the whole way through:

• Media: A narrative game about a young fox in an ancient forest
• Trailer length: ~20 seconds
• Tone: Moody, magical, slightly haunting
• Goal: Make players curious enough to click “wishlist” or “see more”

The finished trailer we’re aiming for

Here’s the actual shot list we’ll build around:

1. Shot 1, 0:00–0:03 (3s)

• Framing: Wide shot, side view
• In frame: A small fox on a forest path at dusk, trees towering overhead
• Action: Fox walks slowly; soft particles of light drift in air
• Text on screen: “In a fading forest…”
• Audio: Low atmospheric hum, distant owl

1. Shot 2, 0:03–0:06 (3s)

• Framing: Medium close‑up behind the fox
• In frame: Back of fox’s head, glowing acorn hovering ahead between trees
• Action: Acorn pulses softly, forest briefly brightens with each pulse
• Text on screen: “A single light remains”
• Audio: Subtle chime with each pulse

1. Shot 3, 0:06–0:10 (4s)

• Framing: Close‑up on fox’s face from the side
• In frame: Fox’s eyes widening, acorn glow reflected in eyes
• Action: Fox narrows eyes with determination
• Voiceover: Soft narrator: “Will you follow it…”
• Audio: Pad rising, slight tension

1. Shot 4, 0:10–0:15 (5s)

• Framing: Dynamic tracking wide shot
• In frame: Fox sprinting after the acorn through twisting roots and ruins
• Action: Camera tracks alongside; acorn zips ahead; forest blurs slightly
• Text on screen: “Before the forest goes dark?”
• Audio: Percussion kicks in, rising

1. Shot 5, 0:15–0:18 (3s)

• Framing: Overhead shot
• In frame: Fox stepping onto a ruined stone circle, acorn flaring bright in center
• Action: Light spreads out in runes on the ground
• Audio: Music hits a sustained, shimmering note

1. Shot 6, 0:18–0:20 (2s)

• Framing: Title card
• In frame: Logo: “Fox & the Glowing Acorn” with forest silhouette behind
• Action: Release date / “Wishlist now” text fade in
• Audio: Final soft chime, then trail off

Everything we do with AI will be in service of this storyboard. Let’s break down how to get there.

Step 1: Decide the trailer’s job before touching any AI

Before you open any AI trailer maker, answer these on paper:

1. What single emotion should a viewer feel at the end?

For our fox game: gentle urgency + wonder. That guides music, pacing, and color.

1. What action do you want right after they watch?

• For a game: wishlist / follow the project
• For a book: pre‑order / subscribe / join mailing list
• For a film: watch the full short, buy tickets, or follow on social

1. Who is the trailer actually speaking to?

• Cozy exploration game fans
• People who like quiet fantasy and atmosphere

That tells us we don’t need constant cuts or explosions. We need mood, clarity, and charm.

Write these three answers at the top of your planning document. They’ll keep you from wandering.

Step 2: Build a tight story spine for 15–30 seconds

AI video is not cheap. Every extra second is another block of renders you may have to redo. Before you ask anything of an AI trailer maker, reduce your trailer to a one‑sentence spine:

> “A young fox discovers a glowing acorn that might save a dying forest, if you can reach it in time.”

Now turn that spine into 3 beats:

1. Setup: The forest is fading.
2. Spark: A glowing acorn appears.
3. Promise: A tense chase to save the forest.

Map these beats onto time:

• 0–5s: Setup (forest + fox)
• 5–12s: Spark (acorn appears, fox reacts)
• 12–20s: Promise (chase and title)

Then align our earlier shot list with those beats. You’ll notice:

• Shots 1–2: Setup
• Shots 2–3: Spark
• Shots 4–6: Promise

This structure makes sure every second is doing a job. When the AI gives you something pretty but irrelevant, you can confidently discard it.

Step 3: Turn the beats into a real shot list before animating

Resist the urge to “see it first.” You pay for that curiosity. Instead, write each shot like a mini script.

For each shot, spell out:

• Framing (wide / medium / close, angle)
• Who is in frame
• What changes in the shot (action or emotion)
• Any on‑screen text
• Approximate duration

We already did this above. That level of detail protects you from common AI headaches:

• The fox model changing color between shots
• A close‑up coming back as basically the same wide shot
• The wrong character’s mouth moving during a line

Because you’ve defined where the camera is and who is speaking, you can be very explicit in prompts and avoid “guess what I want” failures.

If you use a tool that storyboards your shots first, use that stage to catch continuity problems:

• Is the fox suddenly taller in shot 4 than shot 1?
• Did the acorn move from right hand to left without a reason?
• Is the ruined stone circle visible earlier than it should be?

It’s far cheaper to fix this at storyboard level than in full animation.

Step 4: Design characters and world once, then lock them

One big AI trailer maker pitfall: characters drifting. Hair color shifts, clothes morph, snouts change shape between shots. That kills the illusion fast.

For “Fox & the Glowing Acorn,” we define:

• Fox
• Fur: warm reddish orange, white chest, black-tipped ears
• Eyes: large, amber, expressive
• Clothing: none, but maybe a simple green scarf for silhouette
• Personality: cautious but brave

• World
• Forest: towering mossy trees, faint glowing spores in air
• Color palette: deep teals and greens, warm orange light from acorn
• Tech level: no visible human tech, all ancient stone and nature

Practical tips:

• If your tool lets you create characters once and reuse them, do that before anything else.
• Save reference stills of your main character and environment. When a shot comes back wrong, you can tell the system “make this match the reference” instead of starting from scratch.
• Avoid complicated outfits or detailed patterns at first. AI models can drift on these, especially in motion.

You might be tempted to make new character variations to “fix” issues. Try not to. The more versions you create, the harder it is to keep continuity.

Step 5: Writing prompts and directions that AI can follow

You don’t need flowery prose. You need instructional language that matches your shot list.

Compare these for Shot 2.

Vague prompt:

> “The fox sees a mysterious light ahead and the forest grows brighter.”

Better, specific prompt:

> “Medium close-up from behind the small orange fox, centered in frame. The fox stands on a dark forest path. In the distance, a single glowing acorn hovers between two trees at fox eye level. The acorn gently pulses. With each pulse, the surrounding trees brighten slightly, then dim again. No camera movement.”

You’re explaining to a camera operator, not writing a novel.

For lip sync and who speaks when:

• Always specify: “No one speaks in this shot” or “Fox’s mouth does not move.”
• When there is voiceover, say: “Disembodied narrator speaks; fox’s mouth stays still.” This helps avoid bizarre shots where the wrong character’s mouth starts flapping along with the line.

Use your shot list as prompt scaffolding. You already have the details; you’re just turning them into imperatives.

Step 6: Storyboards first, video after

If your AI trailer maker can give you drawn storyboard frames before full video, use that feature ruthlessly.

For our example:

1. Generate rough storyboard images for each of the 6 shots.
2. Check them for:

• Character look consistency
• Position of the glowing acorn
• Camera angle and framing matching your notes
• Text placement not covering important visual elements

1. Iterate at the storyboard stage:

• “Move the acorn a bit higher above the stone circle.”
• “Bring the camera closer to see the fox’s facial expression.”
• “Make the forest darker so the acorn glow stands out.”

Every small fix you make here saves you paying for a full animated shot that you’d just have to throw away later.

Ajax Studio, for example, forces this discipline by drawing every shot as a storyboard picture before animating anything, and lets you change any one shot or scene by typing. That sort of workflow is ideal for trailers where continuity really matters.

Step 7: Control pacing with seconds, not vibes

“Make it feel dramatic and snappy” is not direction. Your edit lives and dies in the timing.

Use your fox trailer to think in seconds per shot:

• Shot 1: 3 seconds
• Shot 2: 3 seconds
• Shot 3: 4 seconds
• Shot 4: 5 seconds
• Shot 5: 3 seconds
• Shot 6: 2 seconds

Notice the structure:

• We spend more time (4–5 seconds) on emotional and action peaks.
• We keep the title short to avoid dragging.

When you request shots from an AI trailer maker:

• Include target duration in your description.
• After you get video back, trim in your editor rather than re-rendering entire shots when possible.
• If a shot feels too “stiff” because it’s a static camera, you can often shorten it and let music carry the energy.

If your tool lets you set duration per shot directly, treat those numbers as sacred. Don’t casually bump 3 seconds to 6. Doubling a shot’s length doubles the cost and often kills momentum.

Step 8: Handling AI‑specific problems without losing your mind (or wallet)

1. Characters drifting between shots

Problem: In shot 1 the fox has a green scarf; in shot 4 it’s mysteriously blue.

Fixes:

• Reuse the exact same character asset or preset across shots instead of describing them from scratch.
• Reference earlier shots in your prompt: “Use the same fox as in shot 1, with the same green scarf and fur colors.”
• If the tool allows, lock the character’s design project‑wide once you’re happy.

2. Close‑up comes back as a copy of the wide shot

Problem: You asked for a close‑up on the fox’s face but get a mid‑shot showing half the forest again.

Fixes:

• Add framing detail: “Fox’s face fills most of the frame; only a thin background strip of forest is visible.”
• Mention cropping: “Crop tightly so we only see from fox’s nose to ears.”
• If the tool supports storyboards, enforce that at sketch stage before generating the final clip.

3. The wrong mouth moves

Problem: You wanted narrator voiceover, but the fox looks like it’s talking.

Fixes:

• In the prompt: “Narrator speaks; fox’s mouth and jaw remain still.”
• If it keeps failing, consider cutting that shot as purely visual and move the line to a different shot where no character is visible.

4. Safety checker blocking harmless shots

Problem: You try to show the forest going dark and get a warning about “disturbing imagery,” or ruins look too ominous and get flagged.

Fixes:

• Adjust wording from “dark, dying forest” to “dim, fading forest” or “quiet, overgrown forest.”
• Remove any words that could be read as violence or harm, even in a metaphor.
• Emphasize “gentle,” “calm,” “peaceful” in your prompts if you just want mood.

Expect to occasionally rephrase innocuous ideas in more “comforting” language.

5. Budget reality: every second costs

For trailers, think in short, carefully planned clips:

• Prefer 6 shots at 3 seconds over 2 huge 9‑second shots. The shorter clips are more reusable and cheaper to redo if one fails.
• Don’t generate full alternative versions of the entire trailer. Instead:
• Lock shots 1–4 once good.
• Experiment on shots 5–6 for variations of ending/title.

Use AI to cover the hardest shots that you can’t do yourself, not to fill space.

Step 9: Sound, music and text: half your trailer’s impact

Visuals get the attention, but audio sells emotion.

Music

For the fox trailer:

• Start with a low, airy pad and subtle forest ambience at 0–5s.
• Introduce light chimes when the acorn pulses in shot 2.
• Bring in gentle percussion and a rising chord change as the chase begins in shot 4.
• Hit a shimmering sustained note and a final chime under the title.

Options:

• Use copyright‑free libraries if budget is tight.
• If your AI tool can generate songs or stems, treat that as your composition scratchpad:
• Build a single track with soft pads and simple rhythm.
• Export stems so you can lower drums or raise chimes in your editor.

Ajax Studio’s song studio, for example, lets you split a song into tracks like vocals, drums, bass, guitar and keys, and adjust the mix, mute parts, or export everything. That kind of detail control is handy when you want music that swells exactly as the acorn flares, without hiring a composer.

Sound design

Even simple touches help:

• Footsteps on forest ground as the fox walks and runs
• Soft rustle of leaves when camera glides past trees
• A gentle whoosh when the acorn pulses

You can find free or cheap sound packs and layer them under the music. Keep them subtle.

On‑screen text and titles

Use text sparingly:

• One line per beat:
• “In a fading forest…”
• “A single light remains.”
• “Before the forest goes dark?”

Practical tips:

• Place text where it doesn’t collide with high‑detail areas.
• Test readability on a phone screen if you expect mobile viewers.
• Keep fonts clean and legible; avoid ultra‑stylized fonts that AI tools sometimes hallucinate poorly.

Step 10: Put it all together and iterate with purpose

Once you have your shots, music and sound:

1. Rough assemble your clips in your editor in correct order and durations.
2. Lay music under the whole timeline, roughly aligned with emotional beats.
3. Add voiceover if you have it, then adjust shot timings so key moments land on musical changes.
4. Overlay text last, then tweak position so it’s never lost in the background.

Watch it several times and note:

• Where your attention drifts.
• Where you feel confused about what’s happening.
• Where the fox’s design changes or movement feels off.

When you go back to your AI trailer maker to fix things:

• Only regenerate the shots that break continuity or pacing.
• Keep previous versions organized, so if a “fix” is worse, you can revert.
• Always compare new renders side‑by‑side with old ones and your storyboard.

This is how you keep costs down and quality up: small, targeted passes, not endless full regenerations.

When an AI trailer maker is actually the right choice

Use AI when:

• You have a clear visual concept but not the animation skills or budget to hire a full studio.
• You’re making proof‑of‑concept trailers for pitches, crowdfunding, or social teasers.
• Your story relies more on mood and symbolism than intricate fight choreography or complex physical comedy, which are still tricky.

Consider alternatives when:

• You need pixel‑perfect control over every frame and motion.
• Your story has very specific branded characters that must match an existing style exactly.
• You’re in a context where any visual inconsistency could damage trust, like big‑budget commercials.

Blend approaches if you can:

• Use AI for magical, atmospheric, hard‑to‑shoot environments.
• Use simple 2D motion graphics or live‑action you shoot yourself for titles and interface shots.

Ajax Studio fits well when you want structured help: it can take a one‑sentence description of a trailer, write the story, storyboard every shot, then generate scenes with pricing shown at each step. Projects are grouped by show or band, and characters keep the same look and voice across videos, which helps a lot with continuity.

Quick recap: a repeatable process for AI‑assisted trailers

Using our fox and glowing acorn example, here’s the workflow you can reuse:

1. Clarify the trailer’s job: emotion + viewer action.
2. Write a one‑sentence spine, then expand to 3 beats.
3. Turn beats into a shot list with framing, characters, action, text, and seconds.
4. Design characters and world once and reuse them everywhere.
5. Write prompts like directions, not poems.
6. Insist on storyboards first, fix continuity there.
7. Control pacing by planning durations per shot.
8. Tackle AI‑specific issues: character drift, wrong mouth, safety filters, budget limits.
9. Craft audio and text to sell mood and clarity.
10. Assemble, then iterate deliberately, only regenerating what truly needs fixing.

If you think of your AI trailer maker as a slightly unpredictable junior animator who needs precise direction, you’ll get much better results. The craft is still yours: choosing moments, shaping emotion, and making sure that, by the last two seconds, your viewer is thinking one thing:

“I want to see more of that.”