-c:v selects the audio codec to use for the output format, which is x264.-i represents the input source as the display :0.0, which represents the primary display on X11.-s signifies the area in pixels that we want to capture.-framerate indicates the framerate to use, which is 20.-y overwrites the output file without a prompt.-f specifies the input format, which is x11grab to allow screen capturing on X11.
