B-roll
B-roll is everything that's not the main on-camera "A-roll". When a creator is talking and the visual cuts to a wide shot of a city, a product close-up, a screen recording, or an animated overlay while the voiceover continues — that's B-roll. The term comes from broadcast where the primary footage ran on the "A reel" and supplementary footage on the "B reel".
B-roll is supplementary footage cut over the primary on-camera audio — illustrative clips that visualise what the host is talking about without interrupting the spoken line.
Why B-roll matters for YouTube creators
B-roll is the single most effective tool for fighting AVD drop-off in talking-head content. A 10-minute video that's 100% A-roll (creator talking to camera) typically loses 5-10 percentage points of retention compared to the same script cut with 30-40% B-roll. Visual variety holds attention; static talking-head triggers tab-switching. B-roll also raises production quality perception, which lifts subscribe rates and sponsor pricing. The trade-off is shooting and editing time — B-roll commonly doubles the post-production cost of a video. Most successful long-form channels treat 30-50% B-roll as a non-negotiable production standard.
B-roll in practice
A history-essay channel cuts to archival images and slow zooms every 6-10 seconds throughout a 14-minute video; AVD lands at 58% versus the channel's 42% baseline before adopting heavy B-roll.
A travel vlogger shoots 4-6 hours of B-roll per destination (drone, wide shots, food close-ups) — a one-day trip yields 25 minutes of cuttable footage and supports two long-form uploads.
See B-roll on real channels
FameLifter pulls public b-roll data for 500K+ YouTube channels — refreshed hourly via the official YouTube Data API v3.