The speaker clip is scaled to size_percent of the screen width (height from its ...
https://ton.halowerk.com/v1/picture-in-pictureOverview
The speaker clip is scaled to size_percent of the screen width (height from its display aspect ratio; circle = centre square crop), masked with an anti-aliased rectangle, rounded-rectangle (corner radius 12 % of the shorter side) or circle mask, optionally framed by a border of border_px in border_color, and overlaid with ffmpeg 6.1 at the chosen corner with margin_px from the frame edge to the outer border.