What is B-roll?
Contrary to what someone I once met thought, B-roll isn't an abbreviation for a Bacon-Roll sandwich. In the film world, B-roll is the footage that is used to enrich the story you are telling and is shot in addition to the main footage or A-roll that is captured. Filming B-roll also adds flexibility when it comes to the editing stage of your video.
In the timeline above, I filmed a 1-hour interview with the CEO of the company - this is the A-roll. Throughout the interview, he talked about the history of the company, products that were currently on offer and what the future looked like for them. Generally there are two main things to consider when filming an interview:

Few people have had formal training for public speaking. Less so, training to be in front of a camera. So it's understandable that sitting down in front of a lens for an hour can be intimidating. It's very difficult to deliver a speech perfectly, so as you'll see in the video example below, it's normal to have "uhms", "you know" etc. throughout. Long pauses, fumbles and even blanks are expected. While all of this is going on, as a filmmaker, I'm behind the camera mentally editing the video together and thinking which and how many B-roll shots would be beneficial to film after the interview is over. 

Another reason to film and include B-roll (aside from covering up edits) is to engage the viewer. While a 2-3 minute video of someone talking could be entertaining if edited correctly. The viewer will be more immersed in the story if context is shown. This is one of the fundamentals in storytelling, "show, don't tell". Having someone say "I wake up every morning at 04:00 am." is fine, but if you can show her standing at a bus stop in the early hours when the streets are dark and empty, all the better. The audience can relate and empathise with that shot much more.

Now that we’ve discussed the two main benefits of allotting time after the interview to film B-roll, let’s see how this is applied in the video below where we go from raw footage or A-roll to finished piece with B-roll and music: 
Production Workflow
Every production has different objectives and so scheduling time for B-roll will always differ. But as a guide, on a basic shoot, for example, something similar to the one above (a store), if 1 or 2 hours have been spent on the interview including retakes, then 2 hours should be reserved for filming B-roll. If for whatever reason that amount of time cannot be made available, a simple shot of the speaker entering and leaving the building will help act as bookends to the video.
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