Add B-roll to Video with AI
Place supporting visuals where the story is describing something, instead of leaving a talking-head on screen for every sentence. Cubix Add B-roll can search stock, use your uploads, or run an auto pass from the transcript — and every cutaway stays a layer you can swap or remove.
B-roll here means placed footage: stock or yours. It is not a generated movie of the scene.
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Talking-head
Voice continues underneath.
Cubix Add B-roll
- Reading the transcript
- Picking moments to cover
- Matching footage
- Laying cutaways on top
Cutaways placed
0:02
0:03
0:04
- Original audio stays
- Cutaways are layers
- Any insert can be swapped
What is B-roll in video editing?
B-roll is the supporting footage that covers a talking-head: a cutaway of the thing being described, a process being explained, or a place being named. It sits over the original audio so the voice keeps going while the picture changes. Cubix Add B-roll places those cutaways from stock footage or your own uploads. An Auto option can read the transcript, pick moments worth covering, and find matching clips.
A talking-head explaining a visual idea still looks like a talking-head.
When someone describes a product, a place, a workflow, or a result, the picture should sometimes show that thing. Doing it by hand means noting every line, searching a library, trimming each shot, and laying it over the voice. Add B-roll is that placement job. It is not the whole editing agent, and it is not Creator Polish. It is the cutaway pass.
Stock
Search stock video and place a matching cutaway on the timeline.
Uploads
Use footage you already recorded — product shots, screen captures, b-roll you filmed yourself.
Auto
Reads the transcript, picks moments that are worth covering, and finds footage for each one.
What Cubix Add B-roll does
- 01
Places cutaways over the original take
Supporting visuals sit on top of the talking-head. Your spoken audio stays underneath.
- 02
Searches stock footage
Look up a shot — a city, a product-in-use, a process — and drop it onto the line it belongs to.
- 03
Uses your own uploads
Prefer your library when you have the real thing: a product, a screen, a location you actually filmed.
- 04
Can place B-roll automatically from speech
Auto reads the transcript, chooses moments that are describing something visual, and finds footage for those lines.
- 05
Lets you set how long a cutaway holds
Hand-picked inserts can run about two, three, or five seconds, then you can still trim them on the timeline.
- 06
Keeps every insert editable
Swap a shot, delete one, add another. Revert takes out the cutaways this pass added without touching B-roll you placed by hand.
How to add B-roll to a video with AI
- 1
Add the video that needs support
A talking-head, tutorial, product walkthrough, or explainer that currently shows only the speaker.
- 2
Open Add B-roll
Choose Stock to search, Uploads to use your own clips, or Auto to let Cubix read the transcript and place matching cutaways.
- 3
Review every insert
Play through. A shot that almost matches is still yours to replace. A moment that should stay on the speaker is yours to uncover.
- 4
Trim, swap, or export
Adjust length and timing on the timeline, then export, or keep finishing with captions, reframing, or the editing agent.
Choose the source. Then treat every insert as a layer.
Auto is a starting placement from the transcript. Stock and Uploads stay available when you want to pick the shot yourself.
Source
Where the cutaway footage comes from.
Length
How long a hand-picked cutaway holds.
Auto finds and places clips from the transcript. Length applies when you are picking shots yourself. Either way, you can still trim on the timeline.
B-roll is a cutaway pass, not a full edit.
AI Editing Agent / Creator Polish
“Make the whole video better.”
- Coordinates several kinds of edit
- Can include pacing, captions, and more
- Is a broader treatment than cutaways alone
Add B-roll
“Show the thing being talked about.”
- Places supporting visuals
- Uses stock or your uploads
- Can auto-place from the transcript
- Leaves the voice underneath
Where B-roll is doing real work
Tutorials
Cover the step being explained instead of holding on the presenter for the whole lesson.
Product demos
Cut away to the product, the UI, or the result while the voiceover keeps going.
Creator videos
Break up a talking-head with visuals that match the point, without rebuilding the whole edit.
YouTube videos
Support a long-form explanation so the middle of the video is not only a face.
Marketing videos
Pair a claim with a picture of the product, the place, or the outcome.
AI can place the cutaways. You still pick the picture.
Every insert is a normal overlay. If Auto chose the wrong shot, replace it. If a line should stay on the speaker, delete that cutaway.
Cubix handles
- Stock search
- Using your uploaded clips as cutaways
- An auto pass from the transcript
- Laying B-roll over the original audio
You control
- Stock vs your footage vs Auto
- Which moments get covered
- Which shot sits on each line
- How long each cutaway holds
- Removing or reverting the pass
- Final export
AI B-roll FAQs
B-roll is supporting footage used as a cutaway while the original audio continues. It shows the thing being described instead of holding on the speaker for every line.
Yes, if you choose Auto. That pass reads the transcript, picks moments worth covering, and places matching footage. You can also search stock or use your own uploads instead of running Auto.
Yes. Every cutaway is a layer. Swap the shot, trim it, delete it, or revert the cutaways this pass added.
From stock video search, from files you have uploaded, or from the Auto pass that matches footage to the transcript. Cubix is placing existing clips, not inventing a generated scene of your footage.
Those are the main jobs: a talking-head that needs visuals, a tutorial that should show the step, and a product or marketing video that should show the thing being claimed.
Yes. Cutaways are video overlays. The spoken track is not replaced by the B-roll.
Yes. Use Uploads and place your clips, or restrict what Auto can pull from. If you do not want stock, do not search Stock.
No. Add B-roll is the cutaway pass. The AI Editing Agent can plan and apply several kinds of edit from a prompt, which may include B-roll along with cuts, captions, and reframes.
No. Creator Polish is a broader everyday finish for talking-head footage. Add B-roll only places supporting visuals.
When you pick shots yourself, Cubix offers short holds around two, three, or five seconds. You can still trim any insert on the timeline after it lands.
No, and it should not. Auto looks for lines that are describing something visual. A stretch that should stay on the speaker can remain uncovered, or you can delete an insert after the fact.
Yes. Open Add B-roll again, search another shot, or drop in another upload. The timeline keeps the layers you already approved.
If the line is visual,the picture should be too.
Place B-roll from stock or your uploads, review every cutaway, and keep the voice underneath.
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