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Demo Recording
From Quake Wiki
To record a demo, type in the Quake console: record mydemo
To stop demo recording, type in the Quake console: stop
To play a demo: playdemo mydemo
If you have a video codec installed like Google's VP 8 and are using FitzQuake Mark V on Windows:
To convert a demo to AVI movie: capturedemo mydemo
Notes: GLQuake could not start recording a demo after the start of a map, but most modified engines like Quakespasm support this (an example of engine that doesn't is DarkPlaces).