B-Roll
Supplementary footage that supports your main content — the coffee close-up in a cafe review, the city timelapse under narration, the hands-typing shot in a tech video. AI video generation is a b-roll machine: instead of buying stock or filming, you generate exactly the 5-second clip you need, matched to your color grade and mood. This is one of AI video's most commercially useful applications today, since b-roll tolerates small imperfections that would sink a main shot. Example: 'macro shot of rain drops on a window, shallow focus, moody blue tones'.