video capture

Hello there. I am interested in streaming technology in general and i want to understand how OBS software is even possible. How does the software fetches rendered frames from the computer to then encode them in the first place? I find this topic interesting, but did not found anything related...

Hi guys, my setup as follows: Elgato HD 60 Pro installed Mainmonitor: Acer Predator 144 Hz G-Sync Displayport to GPU for Gaming Secondmonitor: Old Acer 60 Hz DVI to GPU for Chat etc Nintendo Switch via HDMI to Elgato IN There are two scenarios for me: 1. Just capturing Switch Gameplay to my...