I want to see either a persistent rectangle box on the edges of the region being recorded (anything outside the box isn’t recorded), or dim the parts of the screen that aren’t being recorded. I looked for screen recorders for hyprland & wlroots and didn’t find any with this functionality. wf-recorder + slurp works for me but I want a boundary visual.
I use ffmpeg to record only the top left corner of my screen but I don’t have any visual for it.
I used https://github.com/ftorkler/x11-overlay/ in the past for another tool, maybe this could help you.