thumb|right|B-roll video of computer server racks|thumbtime=13:53
thumb|right|B-roll video of computer server racks|thumbtime=13:53
In film and television production, B-roll, B roll, B-reel or B reel is supplemental or alternative footage intercut with the main shot. The term A-roll, referring to main footage, has fallen out of use to some degree.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).