obs
Open Broadcaster Software.
TLDR
Launch OBS
$ obs
Launch OBS in portable mode
$ obs --portable
Automatically start recording a video on launch
$ obs --startrecording
Automatically start the replay buffer on launch
$ obs --startreplaybuffer
Automatically start streaming on launch
$ obs --startstreaming
Minimise to the system tray on launch
$ obs --minimize-to-tray
Make the log more verbose (for debugging)
$ obs --verbose