Face Analysis: Detect Faces, Scene Changes and Keyframes

Before face tracking can follow anyone, Bitcut needs to analyze the clip to find faces and understand the scene structure. This analysis runs entirely on your device and typically takes a few seconds per clip.

Starting Analysis

1

Select a clip on the timeline

Tap the clip you want to analyze. The clip toolbar appears below the preview.

2

Tap the Face button

In the clip toolbar, tap the face icon. This opens the face tracking mode and starts analysis automatically if the clip hasn't been analyzed yet.

3

Wait for analysis to complete

A progress indicator shows analysis status. Bitcut scans through the clip detecting faces, identifying scene changes, and generating tracking data. This usually takes 2-5 seconds.

4

Review the face strip

After analysis, a face strip appears at the top of the timeline showing detected faces and scene boundaries. The preview updates to show the cropped vertical frame.

What Happens During Analysis

The analysis process detects several things at once:

  • Face positions — where each face appears in every frame, its size, and movement
  • Scene changes — camera cuts, angle switches, and transitions between shots
  • Face identity — which face detections belong to the same person across frames
  • Keyframe generation — optimal crop positions with smooth transitions between them

Re-Analyzing a Clip

If you've trimmed a clip or want to refresh the tracking data, you can re-run analysis. In the face tracking mode, tap Re-analyze to discard existing data and start fresh. This is useful after you change clip boundaries, since the face positions may need updating for the new time range.

Analysis is per-clip. Each clip on your timeline has its own face tracking data. Changes to one clip don't affect others.