Glossary
B-roll: the cutaway footage that keeps viewers watching
When someone talks on camera, that is your A-roll — the spine of the story. B-roll is everything you cut away to: the hands, the place, the process, the proof. This guide explains what B-roll is, when it earns its place, and how to shoot and edit it so viewers keep watching.
From the Mellius product team · Updated September 28, 2026
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The short answer
B-roll is the supplementary footage that plays over or between your main shots. While A-roll carries the story — usually an interview or presenter — B-roll shows it: details, places, actions, and evidence. Editors use it to cover cuts, illustrate ideas, set scenes, and keep the picture changing so viewers stay engaged.
It shows what the words say
Good B-roll illustrates the narration or dialogue playing over it, so viewers see evidence instead of just hearing claims.
It covers a cut gracefully
Useful B-roll hides trims, removes mistakes, and bridges jumps in time or location without a jarring break.
It refreshes the picture
Strong B-roll changes the shot every few seconds during long explanations, giving the eye something new before attention fades.
B-roll vs. A-roll: the full definition
A-roll is the primary footage that carries the story forward — most often an interview, a presenter, or the main event unfolding. The term comes from film days, when editors literally cut two rolls of film: the A-roll held the main action, and the B-roll held the supplementary shots spliced in over it. Today the rolls are gone but the job titles remain: A-roll tells, B-roll shows.
Common kinds of B-roll include cutaways (a reaction or detail shot that interrupts the main action), insert shots (close-ups of objects, screens, or hands), establishing shots (wide views that set a location), and sequences (a few related shots edited together, like arriving, ordering, and tasting). What unites them is function: each shot exists to support a moment in the main story rather than stand alone.
When B-roll earns its place
Reach for B-roll whenever the viewer has stared at one shot long enough to drift — typically during long explanations, lists, or stories. It also earns its place when words make a claim the camera can prove: a revenue number pairs with a dashboard close-up, a travel story pairs with street footage, a recipe pairs with sizzling pans. If a sentence describes something visible, that sentence wants a picture.
B-roll also does structural work. It covers the trims where you removed filler words, bridges a jump between two locations, and sets pace: quick cutaways add energy to montages, while slow wide shots give emotional moments room to breathe. The rule is simple — every cutaway should either prove something, cover something, or move the feeling forward.
Common B-roll mistakes beginners make
The most frequent mistake is decorative B-roll: pretty shots that have nothing to do with the words underneath. A sunset over narration about pricing confuses viewers instead of convincing them. Related to this is mismatched footage — shaky handheld clips or different lighting spliced into a polished interview — which breaks the illusion that everything was filmed in one world.
The second mistake is proportion. Too little B-roll leaves long talking stretches that feel static; too much turns the video into a montage that loses the speaker's connection with the viewer. Aim for variety with restraint: change the picture when attention needs refreshing, then return to the speaker before the audience forgets who is talking.
A practical sequence
Put it into practice
- 01
List the sentences that need pictures
Read your script or transcript and mark every claim, place, or process a viewer should see. Each mark becomes one shot on your B-roll list.
- 02
Capture short, steady, well-lit clips
Shoot five to ten second clips with a still camera or phone, matching the light and color of your main footage. Gather more options than you need so the edit has real choices.
- 03
Lay B-roll over cuts, then watch it through
Place cutaways where attention dips or trims need cover, keeping each shot on screen just long enough to read. In Mellius, you can ask for B-roll over a specific line and then trim the result on the editable timeline, undoing anything that feels off.
Frequently asked questions
How much B-roll do I need?
Plan roughly one cutaway for every few sentences of talking-head footage, and more for fast-paced social video. A five-minute interview typically needs fifteen to thirty short clips. It is better to overshoot simple options than to discover a gap during editing.
Can I use stock footage as B-roll?
Yes, stock footage works well for generic subjects like cities, offices, or nature, and it saves shoot days. Match its lighting and color to your main footage so it blends in. For anything specific to your story — your product, your space, your process — film it yourself.
What is the difference between B-roll and cutaways?
A cutaway is one type of B-roll: a single shot that briefly interrupts the main action, like a reaction or detail. B-roll is the broader category covering cutaways, inserts, establishing shots, and sequences. All cutaways are B-roll, but not all B-roll is a cutaway.
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Primary sources
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