B-roll
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B-roll or B roll is unrelated talk during an interview.
This technique of using the cutaway is common to hide zooms in documentary films: the visuals may cut away to B roll footage of what the person is talking about while the A camera zooms in, then cut back after the zoom is complete. The cutaway to B roll footage can also be used to hide verbal or physical tics that the editor and/or director finds distracting: with the audio separate from the video, the filmmakers are free to excise "uh"s, sniffs, coughs, and so forth. Similarily, a contextually irrelevant part of a sentence or anecdote can be removed to construct a more effective, to-the-point delivery. This can also be used to change the meaning of the speaker to fit the view of the producer. In fiction film, the technique can be used to indicate simultaneous action or flashbacks, usually increasing tension or revealing information.
"B roll" also refers to footage provided free of charge to broadcast news organizations as a means of gaining free publicity. For example, an auto maker might shoot a video of its assembly line, hoping that segments will be used in stories about the new model year.
[edit] B-Rolls in EDLs
In an Edit decision list (EDL), b-rolls have an entirely different meaning. Linear editing systems are unable to dissolve between clips on the same tape. Therefore, the EDL can mark such clips as "b-roll" to indicate that they should be dubbed onto another tape to make the dissolve possible,
