> Or do different OSs have very different strategies for this? Yup. Check out their capture "source" plugins: https://github.com/obsproject/obs-studio/tree/m

> Or do different OSs have very different strategies for this? Yup. Check out their capture "source" plugins: https://github.com/obsproject/obs-studio/tree/master/plugins/linux-capture https://github.com/obsproject/obs-studio/tree/master/plugins... https://github.com/obsproject/obs-studio/tree/master/plugins/mac-capture https://github.com/obsproject/obs-studio/tree/master/plugins... https://github.com/obsproject/obs-studio/tree/master/plugins/win-capture https://github.com/obsproject/obs-studio/tree/master/plugins...