Anyone got any experience with this for video creation? For high fps capture? Or some references on how to use this effectively? I've got nothing.
When did this command even become available?

I always used a low timedemo and wrote screenshots then synched up audio later (which for some reason always had to be set to 99% playback rate to match up with the video). Obviously, this method still works, just hoped it was a bit 1999 at this point.