What is B-roll? Meaning, origin, A-roll vs B-roll and when you need it

B-roll is supporting footage that is cut in over the main shot, while the main shot’s audio keeps playing underneath. In a video of someone explaining how they make coffee, the shot of them talking is the A-roll; the close-ups of the grinder, the pour and the cup are the B-roll. You keep hearing their voice, but you see what they are talking about.

Wikipedia’s definition puts it as supplemental or alternative footage intercut with the main shot, usually shown without its own sound (Wikipedia).

A-roll vs B-roll

	A-roll	B-roll
What it is	The main footage that carries the story	Supporting footage cut over it
Typical content	The interview, the presenter, the person talking	Cutaways, details, locations, screen recordings, archive
Sound	Its audio is the main soundtrack	Usually muted or used as quiet background
Can the video work without it?	No	Usually yes, but it gets harder to watch

In a talking-head video, the A-roll is you speaking to the camera. Everything else you show while your voice continues is B-roll.

Where the term comes from

The name comes from film labs, not from film sets. 35 mm film was wide enough to hide the joins between spliced shots, but on 16 mm film the splices showed up as flaws in the picture. To hide them, editors spliced each shot to black leader and split the shots across two rolls in alternating order, a checkerboard. Both rolls were then printed onto the same stock, so each shot on one roll lined up with black leader on the other (Wikipedia). The two rolls were the A roll and the B roll, and because both could carry picture at once, the method also made fades and dissolves possible (Lumen Learning).

Television news adds its own version. In a first-hand account, John Premack describes how a second reel holding a cutaway, mostly black leader otherwise, was run in sync with the interview reel so the director could cut to it and hide a splice in the interview. That second reel was the “B” roll (b-roll.net).

When editing moved to videotape in the 1980s, the name moved with it: the “B” deck ran the tape with additional footage such as establishing shots and cutaways, while the sound usually came from the A deck (Wikipedia). The tapes are gone; the term stayed.

Types of B-roll

• Cutaways and inserts. Close-ups of what the speaker is talking about: hands, objects, a screen.
• Establishing shots. Where we are: the building, the street, the room.
• Process shots. Something being made or done, step by step.
• Screen recordings. For tutorials, the app or website being explained.
• Archive and stock footage. Material you did not shoot yourself, licensed or from your own library.
• Reaction and atmosphere shots. People, crowds, weather, the mood of a place.

What B-roll is for

Showing instead of telling. If you say “the dough should look like this,” the viewer wants to see the dough.

Hiding cuts. This is the original job. When you cut a sentence out of an interview, the picture jumps. Laying B-roll over the cut hides the jump while the audio flows on.

Changing the rhythm. A new image every few seconds keeps attention on long videos, where a static face for ten minutes becomes hard work.

Does a talking-head video need B-roll?

Not always, and less than many tutorials suggest. It depends on the length and the content.

Short videos usually do not. A 30 to 60 second Reel, Short or yap video works with the speaker alone. The face is the content, and jump cuts do the job that B-roll used to do: they remove the dead moments and keep the pace up. Viewers have long accepted the visible jump (why the jump cut won).

Explanations of something visual do. If you talk about a product, a place, a recipe or software, show it. Otherwise viewers are imagining what you could have shown them.

Long videos benefit from it. In a ten-minute video, cutting away every 20 to 40 seconds gives the eye a rest. The B-roll does not need to be elaborate: a screen recording, a close-up of your hands, a photo.

A sensible order for a talking-head video: first cut the A-roll so the talking is tight, then decide where B-roll helps. B-roll laid over a slow, unedited take only hides the problem; it does not fix it.

How to shoot simple B-roll on a phone

1. Shoot it after the main take, once you know what you talked about.
2. Shoot more than you need. Five to ten seconds per shot, several angles.
3. Keep it steady. Brace the phone or use a small tripod; slow movements only.
4. Match the light and orientation of the main take. Vertical video needs vertical B-roll.
5. Get close. Details read better on a phone screen than wide shots.

Where slicecut fits

slicecut does not add B-roll; it is not a timeline editor. It handles the step before: cutting the A-roll. You import the take, read the transcript, strike the false starts and repeats with a tap, and set every pause with one dial. The export is rendered on your phone at source quality. Then you lay your B-roll over the clean cut in CapCut, Premiere, iMovie or whichever editor you use for the finish.

More on the editing order in how to edit a talking-head video.