Build a Short-Form AI Video Workflow for Vertical Feeds

Short-form vertical video is no longer a novelty format you squeeze a repurposed landscape clip into. It is often the first place an audience meets a brand, a character, or a story. That changes the work: a 9:16 clip has to earn attention in under two seconds, survive being watched with the sound off, and still feel like a human with taste made a decision somewhere.

AI video generation solves the expensive half of that problem — producing enough visual variety to test ideas quickly instead of storyboarding for a week. But a generator alone does not make a video. A workflow does. What follows is a repeatable path from a one-line concept to a published vertical clip, with prompts, examples, decision criteria, and the failure modes worth avoiding.

Why a workflow beats a pile of generated clips

Most people who bounce off AI video do so for the same reason: they generate twenty clips, none of which match, and conclude the tool is not good enough yet. The tool was never the bottleneck. The missing piece was a constraint set — a shot list, a look, a length, and a reason each shot exists.

A working short-form workflow has four properties:

• It starts with a beat sheet, not a prompt. You decide what happens in second 1, second 8, and second 22 before you type anything into a generator.
• It produces shots in matched batches. Consistency comes from reused references, not from luck.
• It culls aggressively. Expect to keep one in four generations. Budget for that emotionally.
• It finishes in an editor. Captions, sound design, and pacing happen outside the generator, and they matter more than resolution.

Once you accept that generation is one step of six, the quality of your output becomes predictable rather than accidental.

Step 1: Turn a loose idea into a shootable beat sheet

A beat sheet for short-form video is three columns: timecode, what the viewer sees, and what the viewer learns. Keep it to four to six beats for anything under 45 seconds.

The three-beat spine that works for almost everything

• Hook (0–2s): one visual that raises a question. A hand entering frame. A machine doing something unexpected. A face reacting before we know why.
• Turn (3–15s): the thing the hook promised, delivered or complicated. This is where most of your generation budget goes.
• Payoff (final 5–8s): the resolution, the proof, or the loop back to the first frame so the video replays seamlessly.

Write each beat as a single sentence in the present tense. If a beat needs two sentences, it is two beats.

Write the hook line before you write the visuals

Draft the caption or spoken line that will sit over your opening shot. Then design a shot that makes that line inevitable. This ordering prevents the most common short-form failure: a beautiful opening frame that says nothing, followed by an explanation nobody stays for.

A quick test — cover the video and read only the first line. If it does not create a small information gap, rewrite it. "Three ways to light a night scene" is a topic. "This night scene was lit by one phone screen" is a hook.

Step 2: Prompt for a vertical frame, not a pretty picture

Vertical composition is a different discipline. Two people standing side by side in a wide shot become two cropped foreheads in 9:16. The frame is narrow, so depth has to come from layering, not from width.

Describe the camera, not the adjectives

Generators respond more reliably to physical instructions than to mood words. Compare:

• Weak: "a cinematic, gorgeous shot of a barista making coffee, warm lighting, moody."
• Strong: "low-angle medium close-up, camera at chest height, barista's hands in the lower third, steam rising through a backlight from a window behind her, shallow focus, vertical 9:16 framing with headroom above the hands."

The second prompt tells the model where to put things. It also tells you, the director, where things go — which is the point.

Build a reusable prompt skeleton

Most of your prompts can follow the same five-part order:

1. Shot size and angle — "overhead close-up," "eye-level medium shot."
2. Subject and action — one subject, one action, present continuous.
3. Environment and light direction — where the light comes from, what it hits.
4. Lens and depth — shallow focus, wide lens, long lens compression.
5. Format and motion — 9:16 vertical, slow push in, handheld drift.

Save this skeleton somewhere you can paste it. The prompt library is a good place to see how the same skeleton produces very different results when you swap one variable at a time.

What to leave out

Cut brand names, cut camera model numbers, cut three adjectives in a row, and cut anything you cannot see. "Emotional" is not visible. "Tears welling, jaw tight" is. If a phrase would not change the pixels, delete it.

Step 3: Keep characters and style consistent across shots

Consistency is the single hardest part of AI video, and the part that most often decides whether a clip reads as professional or as a slideshow of unrelated stock.

Use reference frames as anchors

Generate or upload a still of your character — front-facing, neutral light, clean background — and reuse it as an image reference for every shot in that sequence. Then change only the variables that must change: camera angle, action, environment.

The AI image generator is useful here: build the character sheet first, approve it, then move to motion. Approving a still is cheap; approving a bad character across twelve clips is not.

Write a look bible in five lines

Keep a short document per project:

• Palette: two dominant colors, one accent.
• Light: source direction and quality (e.g., hard side light, warm, no fill).
• Lens: one focal length feel for the whole piece.
• Wardrobe and props: what never changes.
• Texture: grain level, contrast, saturation.

Paste the relevant lines into every prompt. It feels repetitive. Repetition is the mechanism.

When to break consistency on purpose

A single mismatched shot can be a deliberate cut — a memory, a flash-forward, a change of location. Signal it with a hard audio cut or a one-frame flash so the viewer reads it as a choice rather than an error.

Step 4: Generate in batches, then cull without mercy

Generate three to four variations per shot rather than one. You are not looking for perfection; you are looking for the least wrong option that cuts together.

Cull in two passes:

1. Technical pass — discard anything with warped hands, melting edges, teleporting background objects, or motion that fights the subject. This should take seconds per clip.
2. Editorial pass — watch the survivors muted, at speed. Keep the ones where the action is legible in the first half second. A shot that needs a caption to explain what is happening is a shot that will lose viewers.

Name files by beat and take (hook_a, hook_b, turn_02) so assembly does not become archaeology.

When you need motion you can cut against — establishing shots, transitions, product inserts — template-driven starting points save real time. Browsing video templates is faster than prompting an empty box when the brief is conventional.

Step 5: Finish in the edit, where short-form is actually won

The generator hands you footage. The edit makes it watchable.

The first three seconds

• Start mid-action. No fade-ins, no logo stings, no establishing drone shot.
• Put a visual change — cut, subject entrance, light shift — inside the first 1.5 seconds.
• If the hook is spoken, the first word should land before the first frame settles.

Sound design on a budget

Three layers is enough: a bed (music or room tone), punctuating effects on cuts and actions, and a voice. Duck the bed 6–9 dB under any spoken line. If a clip is designed to be watched muted, add one short text overlay that carries the hook, not a transcript of everything said.

Captions that do not fight the frame

Vertical video is caption-hostile: the platform UI eats the bottom fifth and the right edge. Keep captions in the upper-middle band, use two to five words per line, and never place text where the interface will sit on top of it. Burn in a version and keep a clean master.

Export settings that survive compression

Export at 1080×1920, 30 or 60 fps matched to your source, high bitrate, and a mild sharpen. Platforms re-encode everything, so start with more data than you think you need. Test-upload a private copy before publishing; compression artifacts on gradients and dark scenes are the usual surprise.

A worked example: 30-second product demo

Say you are launching a compact desk lamp and want one vertical clip.

• Hook (0–2s): extreme close-up of a hand clicking the switch; the room goes from dark to warm in one frame.
• Turn (3–16s): three quick shots — the lamp arm folding, the light falling across a keyboard, a wide shot of the desk at night. Each shot two to four seconds.
• Payoff (17–28s): pull back to the whole desk, lamp on, person leaning in to work. Caption resolves the hook: "One switch. Whole room."

Generation plan: one still of the lamp for reference, four motion prompts per shot, three kept, one reshoot on the folding-arm shot because the hinge warped. Edit time: roughly 40 minutes including captions. That is a realistic ratio — most of the work is culling decisions, not typing.

Mistakes that make AI short-form look cheap

• Uniform shot sizes. Five medium shots in a row read as flat. Alternate wide, close, and insert.
• Motion on everything. Constant camera drift is exhausting. Let some shots be locked off.
• Over-lit scenes. Flat, shadowless lighting is the fastest tell. Name a light source and a direction in every prompt.
• Too many ideas. One clip, one idea. A second idea is a second video.
• Ignoring the platform frame. Safe zones, caption placement, and end-card timing are part of the creative brief, not post-production cleanup.
• No clean master. Always keep an export without burned-in text so you can re-cut for another surface later.

Decision criteria: what to build and what to borrow

Before adding another tool, decide where your time is genuinely best spent:

• Volume matters more than uniqueness? Start from templates and vary the copy and the hook.
• A recurring character or host? Invest in a reference sheet and a look bible before generating any motion.
• Fast-moving product drops? Build a reusable shot library — three hooks, three inserts, one payoff — and swap assets.
• Comparing engines? Judge them on reference adherence and motion stability, not on the beauty of a cherry-picked demo. Side-by-side breakdowns like Orelon vs Runway are more useful than spec sheets.

A practical rule: if a shot requires more than two rounds of prompt rewriting, it probably needs a different approach — a still that you animate, or a real filmed insert — rather than a better sentence.

FAQ

How long should an AI-generated short-form video be? If the idea is strong, 15–30 seconds is usually the sweet spot: long enough for a turn, short enough that retention stays high. Only extend past 45 seconds when the concept has genuine progression, such as a build, a transformation, or a mini-story with a twist.

Do I need a different prompt style for vertical versus horizontal? Yes, mainly in framing. State 9:16 explicitly, describe where the subject sits in the narrow frame (lower third, upper third), and lean on layered depth — foreground object, mid subject, background light — because you cannot spread information horizontally.

How many generations should I expect per usable second? Budget roughly three to four generations per shot and two to four seconds per shot. That sounds wasteful until you compare it to a half-day shoot. The savings come from fast culling, not from perfect prompts.

Can AI video keep the same person across a whole clip? Usually, with references. Build one approved still of the character, reuse it in every prompt for that sequence, and change one variable at a time. Expect drift on extreme angles and profile shots; those are the ones to check first.

What should I check before publishing? Motion artifacts at the cut points, caption placement inside the platform safe zone, audio levels on phone speakers, and the first frame as a standalone image. If the first frame is confusing without context, the video starts late.

Is it worth building a shot library? For anything recurring — a series, a product line, a presenter — yes. A small library of reusable hooks, transitions, and inserts turns each new video into an assembly task instead of a blank page.

Start your next vertical clip in Orelon

A good short-form video is a small piece of direction: one idea, three beats, a consistent look, and an edit that respects the first two seconds. AI removes the friction of producing visuals at that pace, which means the remaining work — taste, structure, and finishing — is where your advantage lives.

Orelon is built as an AI video generator for cinematic ideas in motion, so you can move from a beat sheet to moving frames without losing the look you planned. Take a concept you have been sitting on, write the three-beat spine, and generate the first shots. Then read more workflow breakdowns on the Orelon blog and keep refining the system that fits how you actually make things.