B-roll is alternative footage to your main footage (A-roll). In a documentary, your A-roll would typically be interviews, and your b-roll would be footage that supports the topic/stories of those interviews. One thing to keep in mind when shooting b-roll is to try and do it after shooting your A-roll footage, so you have something in mind to help you choose what to film. You also want to keep the same style/consistency when filming b-roll to make your documentary seem reliable. Lastly, you have to choose what kind of b-roll to film depending on the topic of your documentary. If your documentary is about someone’s story, film b-roll that supports/enhances the narrative. If you’re filming an instructional documentary, film b-roll of demonstrations.
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