pub const PREVIEW_WIDTH: u32 = 720;Expand description
Default capture width in pixels. Paired with PREVIEW_HEIGHT
— square dims are the natural input shape for the circular bubble
mask. 720×720 (M-QUAL.3): the webcam’s native 16:9 frame is
center-cropped to 1:1 then scaled here, so the recorded bubble is
crisp at native-resolution output instead of an upscaled 480².