I am using openEMU as an emulator to play retro games (snes era) and would like to record the gameplay. I tried using the quicktime app (as suggested in this answer from ~8 years ago), but this uses the built-in laptop mic - this picks up the sound of my fingers pressing on the controller, and and the occasional cough and sneeze. How can I record this gameplay such that the audio is only the gameplay (nothing external)? Also, a 3 minute HD video with sub-par quality using this method takes up 200+ MB; I'm thinking this won't scale well for a game that plays half-an-hour to an hour.
I looked into this via google and came across an app called "soundflower". However, most mentions of this program are 5-10 years old; some articles state that it is difficult to uninstall. In particular, flux forge mentions that the software is not signed by OSX for versions 10.13 and higher. I am using High Sierra 10.13.6 (in case it's relevant). Is soundflower the way to go here, or are there better alternatives?