The Ultimate Guide to Writing Better Prompts for AI Video Generation

OneMob's AI Video Generator builds a complete video — script, visuals, avatar, and voice — from a short description you type. The quality of that video comes down almost entirely to one thing: how clearly you describe what you want.

You can see a full demo here.

This guide shows you exactly what to put in the prompt box to get a polished, on-brand result on the first or second try. For the click-by-click on where to generate, see Generate a Video with AI.

The one rule: Be specific. A vague prompt forces the AI to guess; a clear one gives it direction.

Quick start: your first prompt in 60 seconds

Every strong OneMob prompt answers five questions. Write one line for each:

1. Goal — what type of video and how long? (e.g. 60-second product explainer)
2. Audience — who is it for? (e.g. mid-market sales prospects)
3. Tone — how should it feel? (e.g. confident and conversational)
4. Key points — the 2–4 things it must say.
5. CTA — the one action you want the viewer to take. (e.g. Book a demo)

Copy-paste template:

Create a [length] [video type] for [audience]. Tone: [tone]. Cover: [point 1], [point 2], [point 3]. End with a clear call to action: [action].

Filled-in example:

Create a 60-second product explainer for mid-market sales prospects. Tone: confident and conversational, fast pace, clean visuals. Cover: the problem of slow follow-up, how OneMob's AI video fixes it, and the time it saves. End with a clear call to action: "Book a 15-minute demo."

Paste it in, click Generate, then review and refine. That's the whole workflow.

The 5 levers that actually change your video

Unlike a film crew, you're not setting camera angles or color grades — you're steering an AI that already handles production. These are the controls that move the needle in OneMob:

1. The prompt (your creative brief)

This is where most of your control lives. Always include goal, audience, tone, and pacing. The more context you give, the less the AI has to invent.

• Instead of: "Make a product overview video."
• Try: "Create a 60-second product overview for sales reps to send to mid-market prospects. Confident, conversational tone, fast pace, clean visuals."

2. Add a script (when the words matter)

If you have required messaging, a value proposition, or compliance-approved language, use Add script instead of relying on the prompt alone. The AI will build the video around your exact words. Best for sales pitches, legal/regulated messaging, and anything where wording can't drift. Because the AI uses what you write verbatim, this is where the craft of the script matters most — see Write a script worth saying below.

VO (voiceover) is simply the spoken narration. When you add a script, you're writing the VO.

3. Add files (so it uses your content)

Use Add files to upload slides, screenshots, product images, one-pagers, or PDFs. The AI uses these as visual context, so your video shows your real product and brand instead of generic stock-style placeholders. This is the single fastest way to make a video look like yours.

4. Avatar & voice

Pin a custom AI avatar and voice for consistency across every video you send — or leave them on Auto and let the AI pick the best match. If you present on camera regularly, a pinned avatar keeps your videos recognizably you. (See Generate a Video with AI to create one.)

5. Format: orientation, duration & style

• Orientation — Portrait for mobile and social (LinkedIn, Instagram); Landscape for email, presentations, and browser viewing.
• Duration — set a target length, or leave it on Auto.
• Style — apply your company Style to keep colors, fonts, and layout on-brand across every video.

Write a script worth saying

When you use Add script, the words are the video. A great script produces better delivery, better pacing, and better visual choices — because there's something real for the AI to work with. These patterns consistently win:

Stories beat lists. A first-person narrative — "I tried this, then that happened" — gives the AI richer material than bullet points. "Here are three reasons to use video" is a list. "I stopped writing long emails and started sending short videos, and my reply rate tripled" is a story. Tell the story.

Bold beats safe. A pointed opener — "Stop sending follow-up emails. They don't work anymore." — earns the next ten seconds of attention and pushes the AI toward bolder choices. You're not trying to provoke; you're trying to be watched.

Flow beats structure. Write the way you'd talk to a colleague. Read your script aloud before you generate — if a line feels awkward to say, it'll sound awkward in the video. That single check catches most problems.

Skip the rhetorical questions. "Are your emails getting ignored? Tired of chasing prospects?" feels unnatural from a single presenter talking to camera. Make the statement instead.

Weak script vs. strong script

WEAK
OneMob lets you create personalized videos, host them on microsites,
and track engagement in your CRM. Reps see higher open rates and
shorter deal cycles.

STRONG
Three weeks ago a deal I'd written off went quiet for a month. So
before I closed it lost, I sent one last video — thirty seconds, just
me, recapping why we'd be a fit. They watched it twice, forwarded it
to their VP, and we signed Friday. I didn't change the offer. I
changed the format.

Both say the same thing. The second one gets watched.

Add tone, not timestamps

After the script, the most useful thing you can add is a tone line — how it should feel, not how it should be sliced up.

DO THIS
[your script]
Tone: Like a CSM checking in with a customer they actually like —
warm, confident, no corporate filler.
Duration: 30 seconds.

AVOID THIS
Scene 1 (0-5s): Hook...
Scene 2 (5-12s): Point 1...
Scene 3 (12-22s): Point 2...

Timestamped scene breakdowns give you precise control and a robotic, choppy result. Describe the tone and let OneMob set the rhythm.

Templates you can reuse

Swap the bracketed text for your details. Keep the winners in a note and reuse them.

Product explainer

Create a 90-second product explainer for [audience]. Tone: clear and modern. Cover: the problem, how [product] solves it, and the top benefit. Landscape orientation, on-brand style. End with: "[CTA]."

Cold outreach — "be the email that gets opened"

Use Add script. Open with a real number or moment from your own experience, name the problem the prospect feels, say what you tried instead and what happened, and close with a human reason to reply. Tone: a rep sharing what's working with a peer — direct, no marketing gloss. 35 seconds, landscape.

Sales follow-up (1:1)

Create a 45-second follow-up video for [prospect name/role] after our call. Warm, personal tone. Recap the main thing they cared about — [topic] — and the next step. End with: "[CTA]."

Renewal / check-in

Create a 30-second check-in for [customer]. Lead with a genuine result they've gotten, acknowledge where you can do more, and make renewing feel like the obvious next chapter — not an invoice. Tone: warm, appreciative, confident.

Executive / account message (translation-ready)

Use Add script. Write a warm, universal message to a key account — avoid idioms and slang, keep sentences short. Add: "This is a direct-to-camera message — one person, one camera, sincere eye contact throughout. The presenter should be on screen the entire video." 40 seconds, landscape.

Social / awareness

Create a fast-paced 30-second portrait video for LinkedIn about [topic]. Energetic, modern tone, strong hook in the first 3 seconds, bold on-screen captions. End with: "[CTA]."

Training/enablement

Create a 2-minute training video explaining [process or feature] for [internal team]. Calm, instructional tone. Walk through the steps in order, keep visuals clean and simple. End with a quick recap.

See the difference

Same tool, completely different output — because the second prompt makes every decision for the AI.

Going global? Make it translation-ready

If you'll translate a video for an international account, the presenter's face needs to stay visible the whole time so lip-sync works. Use Add script, write clean universal language (no idioms or slang, short sentences), and include:

This is a direct-to-camera message — one person, one camera, sincere
eye contact throughout. The presenter should be on screen and
speaking for the entire video.

Frame it as what you want, not what you don't. "No B-roll, no cutaways" tends to produce a flat result. The positive framing above keeps the presenter on screen while still allowing tasteful overlays.

Troubleshooting: my video came out wrong

Don't start over — adjust one thing in your prompt and regenerate.

Tip: Refine one variable at a time. Small adjustments beat full rewrites, and you'll learn which prompts work for your team.

A few quick do's and don'ts

Do

• Lead with goal and audience, then add detail.
• Attach files whenever you have them.
• Read your script aloud before generating.
• Always end with a single, clear CTA.
• Review and edit before sharing — you can trim the video after it generates.

Don't

• Write a vague one-liner and expect a polished result.
• Slice the script into timestamped scenes — it makes delivery sound robotic.
• Build the script around rhetorical questions.
• Tell the AI what not to do — describe what you want instead.
• Stack five different messages into one video.
• Skip the CTA — every video should tell the viewer what to do next.

After you generate: close the loop

A finished video is the start, not the end. To get the full value:

1. Share it on a microsite so it opens instantly, on any device, with your branding and a clear call to action around it.
2. Send it at scale through Campaigns.
3. Track engagement in your CRM — who watched, how long, and what they clicked next — so you know exactly when to follow up.

Get started with OneMob AI Video

Already a OneMob customer?

• Enterprise — AI Video Generation is available to you now. Click the + in the navigation menu and select Generate AI Video to begin.
• Free & Pro — contact your OneMob team for a free trial of AI Video at sales@onemob.com.

New to OneMob?

• Sign up for a free account at onemob.com, then reach out to sales@onemob.com for a free trial of OneMob AI Video.

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• Generate a Video with AI — the step-by-step how-to
• OneMob AI Video Generation Best Practices
• Trimming Your Video
• Introduction to Campaigns — share your finished video at scale