Ijharul Islam
To generate B-roll with AI, mark the moments in your script or transcript where a cutaway would help, write a short prompt for each one that matches your main footage's shape, light and style, generate 3 to 6 second silent clips on a text-to-video or image-to-video model, and cut them over your talking-head or voiceover. AI B-roll is best for generic or hard-to-film visuals, not for showing your real product, team or events.
This guide covers where AI B-roll fits, a step-by-step workflow, twelve prompts for common business topics, how to keep clips consistent, what it costs, and the cases where stock footage or your phone is the better choice.
The short answer
Find the lines in your transcript that need a visual, write one shot prompt per line (subject, action, setting, camera, light), generate 3-6 second silent clips in the same aspect ratio as your main video on a cheap model, keep the style words identical across prompts, then cut them over the A-roll. Use real footage for your actual product, people and events.
Key takeaways
- B-roll is the cutaway footage over a voice or interview; AI is good at generic, conceptual and hard-to-film shots.
- Plan from the transcript: one B-roll shot every 5-10 seconds is a common pace for talking-head videos.
- Match the A-roll's aspect ratio, light and colour, and reuse the same style words in every prompt.
- B-roll is usually silent and short, so cheaper models and 3-6 s lengths keep costs down.
- Don't use AI B-roll to depict real events, people or your actual product as if it were filmed.
Disclosure: we make QuickVeed and show how to do this in it, along with other ways. Details about other products come from their public pages, checked in October 2026 and linked at the end.
What AI B-roll is good for, and what it isn't
B-roll is the secondary footage you cut to while someone talks: hands typing, a city street, a chart, a coffee being poured. It keeps viewers' eyes busy, covers jump cuts, and shows what the speaker describes. AI video models can generate it from a sentence.
| Good fit for AI B-roll | Better with stock or your own footage |
|---|---|
| Concepts and metaphors (a maze, a growing plant, a ticking clock) | Your real product in use |
| Generic settings (an office, a warehouse, a cafe) | Your team, store or office |
| Shots that are expensive to film (aerials, slow motion, weather) | Real events, news or a specific place on a specific day |
| A consistent illustrated or stylised look | Anything a viewer would assume is documentary |
| Visuals for topics with little stock footage | Screens with exact, readable text or UI |
The rule of thumb: AI B-roll should illustrate, not testify. If a viewer would take the shot as evidence of something real, film it or use licensed footage.
Step 1: Find the B-roll moments in your script or transcript
Start from the words, not the footage. Get a transcript of your talking-head video (QuickVeed's captions and subtitles tool makes one at 1.5 credits a minute, rounded up, and you can download it as TXT), then mark every line where a visual would help.
- Lines that describe something concrete (“we pack every order by hand”).
- Abstract ideas that need a picture (“cash flow”, “burnout”).
- Lists, where each item can get its own shot.
- Jump cuts in the A-roll you want to hide.
- The first 3 seconds, where a striking visual helps the hook.
A common pace for talking-head videos is a cutaway every 5 to 10 seconds, each lasting 2 to 4 seconds on screen. A 3-minute video might need 15 to 25 B-roll shots. Note the timecode and a few words describing the shot next to each marked line.
Step 2: Write prompts that match your footage
B-roll that doesn't match the main footage looks pasted in. Decide on a fixed style line and add it to every prompt, word for word. For example: “Natural daylight, soft shadows, muted warm colours, shallow depth of field, photorealistic, 35mm look.”
Then write each shot with subject, action, setting and camera, ending with the style line. Twelve examples for common business topics:
| Topic | Prompt (add your style line) |
|---|---|
| Productivity | Top-down shot of hands ticking items off a paper to-do list next to a coffee cup, slow push in. |
| Growth | Macro shot of a green seedling pushing up through dark soil, time-lapse. |
| Cash flow | Close-up of coins being stacked in small towers on a wooden desk, slow pan right. |
| Remote work | Medium shot of a person on a video call at a kitchen table, laptop glow, from behind the shoulder. |
| Shipping | Hands taping a cardboard box shut on a packing table, close-up, steady camera. |
| Customer service | A headset on a desk next to a notebook, a hand picks it up, shallow depth of field. |
| Data | Slow tracking shot past rows of glowing server racks in a dim room. |
| Stress | Close-up of a hand tapping a pen rapidly on a desk, a phone buzzing beside it. |
| Planning | Sticky notes being placed on a glass wall by several hands, medium shot. |
| City business | Aerial shot gliding over a city street at sunrise, shops opening, light traffic. |
| Food business | Slow-motion shot of flour being dusted over dough on a wooden counter. |
| Ideas | A single desk lamp switches on in a dark room, slow push in. |
If your main video is vertical, generate the B-roll in 9:16 too. Cropping a 16:9 clip to 9:16 loses most of the frame. More prompt tips are in how to write prompts for AI video generators.
Step 3: Generate cheaply, then cut it in
B-roll is usually silent (your voice or music plays over it) and on screen for only a few seconds, so you rarely need a premium model or native audio.
- Generate each shot at 4 to 6 seconds, so you have room to trim the best 2 to 4 seconds.
- Use a cheaper model first; switch to a premium one only for shots that look wrong or get a lot of screen time.
- Reject clips with warped hands, faces or text rather than hoping no one notices.
- In your editor, place each clip over the A-roll at its marked timecode and trim to the phrase it illustrates.
- Apply the same colour adjustment to all B-roll so it sits with the main footage.
- Keep the speaker's audio running underneath; B-roll covers the picture, not the sound.
| B-roll plan | Model in QuickVeed | Credits |
|---|---|---|
| 10 shots, 5 s each, 540p drafts and finals | Luma Ray 3.2 | 10 × 38 = 380 |
| 20 quick 2 s shots | Vidu Q3 Turbo, 540p | 20 × 20 = 400 |
| 2 hero shots, 5 s each, 720p | Kling v3 | 2 × 210 = 420 |
A 3-minute video with 15 cheap cutaways and two hero shots fits inside the Starter plan's 1,000 monthly credits.
Build a library as you go. Name each clip by topic (growth-seedling-916.mp4) and keep the prompts in a document. Generic B-roll such as hands typing or a city at sunrise can be reused across several videos, so the cost per video drops over time.
Common AI B-roll mistakes
| Mistake | Why it hurts | Fix |
|---|---|---|
| Literal B-roll for every word | Feels like a slideshow; viewers stop listening | Illustrate the key nouns and ideas, not every phrase |
| Mixing styles (realistic, then animated) | Breaks the look of the video | One style line in every prompt |
| Clips on screen too long | AI artefacts become visible after a few seconds | Keep most cutaways to 2-4 seconds |
| People's faces in close-up | Faces are where AI errors show first | Prefer hands, objects, backs of heads and wide shots |
| Text, logos or screens in shot | Letters warp and look fake | Add on-screen text in your editor instead |
| Covering the speaker's key moment | Viewers lose the face during the punchline | Cut back to the speaker for the main point |
A good test: watch the edit with the sound off. If the B-roll alone suggests what the video is about and nothing looks odd, it's working.
Doing it in QuickVeed
- Open the AI video generator (in the app it is under Create video).
- Type a prompt, or upload an image to use as the starting frame.
- Choose a model. Clip lengths run from 2 to 15 seconds depending on the model: Veo 3.1 gives 4, 6 or 8 s, Kling v3 3 to 15 s, Seedance 2.0 4 to 15 s, Runway Gen-4.5 5 or 10 s.
- Pick the aspect ratio (16:9, 9:16, 1:1, 4:3, 3:4 or 21:9 where the model supports it) and the resolution (480p to 1080p).
- Check the price shown, then generate. Failed generations are refunded, and every result is saved in your asset library.
For B-roll, pick a silent, cheaper model in step 3 and the same aspect ratio as your main video in step 4. To match a specific look, start from an image: grab a still from your own footage with the free extract frame from video tool and use it as the starting frame, so the generated clip shares the light and colour of the real footage.
After editing, run the finished video through the captions and subtitles tool to burn on captions in one of 11 styles. If your video is a podcast or long interview, Podcast to Clips can then cut it into short vertical clips.
If a B-roll clip shows something realistic that didn't happen, such as a real place in an event, YouTube and other platforms ask you to disclose altered or synthetic content. Generic illustrative shots, like a seedling growing, usually don't mislead anyone, but check each platform's rules. For a longer sequence, see how long AI generated videos can be.
Frequently asked questions
Can AI generate B-roll footage?
Yes. Text-to-video and image-to-video models make short clips from a description, which work well as cutaways for generic, conceptual or hard-to-film visuals.
What is the best AI B-roll generator?
For realistic B-roll, Kling v3, Veo 3.1 and Runway Gen-4.5 give the most detail; cheaper models like Luma Ray 3.2 and Vidu Q3 Turbo suit quick cutaways. Test your style prompt on two models.
How long should B-roll clips be?
On screen, usually 2 to 4 seconds each. Generate 4 to 6 seconds so you can trim the best part.
Is AI B-roll free to use commercially?
It depends on the tool's plan and terms. Check the commercial licence, and don't generate real people, logos or trademarks you don't own.
How do I make AI B-roll match my footage?
Generate in the same aspect ratio, reuse one fixed style line in every prompt, start from a still of your real footage when possible, and colour-correct all B-roll together.
Try it with your own video
Pick three lines from your next script and generate a cutaway for each. Write three B-roll prompts with the same style line, generate them on a cheap model, and judge how well they cut together for yourself. QuickVeed plans start at $18/month, and new accounts get a 14-day trial with 75 credits, no card needed. Sign up or see pricing.
Sources
Competitor details in this post were checked against these public pages in October 2026. Products and prices change, so confirm with each vendor before you decide.
