Can't record output using Quicktime Player.
greetings
I have been able to previously record my computer audio sometimes using a combination of QuickTime player and iShow u capture audio. but now it seems that ishow u isn't compatible with big sur. so I searched online and people say that I can record the output audio using QuickTime alone but I'm unable. neither input nor output is being recorded. and yes, have tried changing my audio sources both from the system preference and from the small rectangle that pops up just before clicking record. but none of the ways seem to work.if there is any free screen recording app that I might download is also great.anything that works is really really appreciated. its really really important that I record everything on my screen along with my audio for my lectures. so please help me out. literally begging anyone. quite desperate here.
MacBook Air 13″, macOS 11.2