Automatic Silence Detection for AI-Powered B-Roll

Auto B-Roll Placement scans your timeline for silent gaps — pauses in speech, breaks between sentences, or sections with no voice — and automatically places B-roll clips over those moments. This saves you from manually finding and filling every pause with supplementary footage.

How to Use

1

Add B-roll clips to your project

Import the supplementary footage you want to use as B-roll. These clips should be separate from your main speaking clips — scenic shots, close-ups, cutaways.

2

Mark clips as B-roll

Select the clips you've imported and designate them as B-roll material. This tells Bitcut they're available for automatic placement rather than being part of the main edit.

3

Run Auto B-Roll

Tap the Auto B-Roll button. Bitcut analyzes speech patterns on your timeline, identifies silent sections, and places B-roll clips to cover them. Clips are trimmed to fit the duration of each gap.

4

Review and adjust

Check the auto-placed overlays. You can reposition, swap, or remove any B-roll clip. The placement is a starting point — fine-tune as needed.

How Detection Works

The AI analyzes your main timeline audio to find sections without speech. It looks for:

  • Natural pauses — gaps between sentences or thoughts
  • Silent clips — clips that have no speech content at all
  • Long pauses — extended silence within a speaking clip

Short pauses (under half a second) are ignored — they're natural breathing gaps that don't need coverage.

More B-roll options = better results: Import several B-roll clips to give the auto-placement more variety. If you only have one or two clips, you'll see the same footage repeated across multiple gaps.
Works with subtitles: If your clips have subtitles, the auto-placement uses word timestamps for more precise gap detection. Run Clips Enhancement first for best results.