How to download YouTube videos using Safari or Firefox | Macworld: And then there’s the ugly way—using a screen capture utility to grab video and audio in real time. You can do this with QuickTime Player by choosing File -> New Screen Recording, but you won’t be able to capture the video’s audio until you install Cycling ’74’s free Soundflower. To do that, download and install Soundflower, open the Sound system preference, and choose Soundflower (2-ch) in the Output tab. Within QuickTime’s Screen Recording window, click on the triangle and under the Microphone heading choose Soundflower (2ch). Start the recording and then start the video playing.