Looking at the source code, this ui can handle x11 or wayland, but wayland can only do window recording or monitor recording, for x11 it's all just handed over to ffmpeg which can handle x,y,width,height input variables.
A few weeks ago, I tried Blue Recorder just because Gnome's Screen Recorder gave out some static when recording a certain area. IIRC, in Blue Recorder I can't even do recording a selected area, maybe because I am on wayland.
Interesting. On wlroots compositors, it is easier to capture a region than a window, so many screen recording tools that target wlroots (for example wl-recorder) support regions but not windows.
Whats the function of the "Select an Area" button in this screenshot then? https://github.com/xlmnxp/blue-recorder/blob/master/screensh...