Short version

  • AI mask is needed fast (Use SAM2 masks for cars, people, and moving subjects, then compose the mask sequence for Heavy Tracking.)
  • AI mask is imperfect (Add animatable polygon masks for manual corrections or simple deterministic regions.)
  • Wrong tracking region (Choose whether Heavy Tracking follows black background pixels or the white masked object region.)

AI masks are fast for object selection

SAM2 mask layers let you click an object in the viewer, confirm the selection, and generate mask frames across the sequence. The Tiny model is fast for simple demos, while larger models can improve quality at a higher processing cost.

Polygon masks are reliable for simple shapes

Animatable polygon masks are useful when the shape is simple, when AI needs correction, or when you want deterministic control. You can add keyframes and let the mask interpolate through the shot.