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Concepts

What's the difference between b-roll and a-roll in video production?

Short answer

A-roll is the primary footage carrying the story, usually interviews or on-camera dialogue. B-roll is supplementary footage that illustrates what's being said and gives the editor cuts to work with. Most documentary-style video is roughly 25% a-roll, 75% b-roll.

A-roll: the spine

A-roll is the footage that carries the words: an interview subject explaining something, a CEO speaking to camera, a customer giving a testimonial. If you watched only the a-roll with no other cuts, the story would still make sense.

B-roll: the visual layer

B-roll is everything that gets cut in over the a-roll: shots of the product being made, the team in motion, exteriors, environmental detail. It's what lets the editor cut around a stumble, condense a 4-minute answer into 30 seconds, and visually support what's being said.

Why the b-roll-to-a-roll ratio matters

If you shoot interviews but skip serious b-roll, you end up with a "talking heads" video that's hard to watch. If you shoot beautiful b-roll but no interviews, you have music-video atmosphere with nothing to say. The right ratio for documentary brand work is roughly 1 hour of interview to 3 to 4 hours of b-roll.

What good b-roll looks like

Specificity and motion. Don't shoot a static wide of the office. Shoot a designer's hands marking up a print, a manager scribbling on a whiteboard, the moment a machinist measures a finished part. The more specific the b-roll, the more it earns its cuts.

Related questions

How much b-roll should I budget for?

For a 3-minute brand film, plan for 3 to 4 hours of b-roll capture. That gives the editor real options instead of a thin pile to choose from.

Can stock footage substitute for b-roll?

Sparingly. Stock can fill gaps (aerial drone shots of a city skyline, generic establishing footage) but it dilutes a brand film fast if used for the actual content.

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