To record your Mac’s Screen with both audio and video:
- Install loopback audio (free extension).
- Open the media you want to screen capture in your application (if it’s a browser, use Firefox or Chrome, not Safari). Start at least 5 seconds before where you want to start – this will usually give time for the application to hide any playback controls which might be distracting. Don’t press play yet.
- Go to System Preferences/Sound. In the sound Output, choose Loopback Audio in the Output tab.
At this point, you will hear no sound from any of your Mac’s applications, but don’t worry.
- Go to the QuickTime Player application; choose File/New Screen Recording.
Click on the red record button.
Then choose the screen you are recording (if you have multiple screens).
- Go to the application that was set to play the video; press play (hopefully you queued up the video to play at least 5 seconds before the area you wanted to capture – this will usually give time for the application to hide any playback controls which might be distracting).
After you’re done recording:
- Stop the video in your application that was playing your video.
- Go back to QuickTime Player; hit the escape key on your keyboard to bring up the record controller, then click on the black square button (stop).
Save your video file.
- Go to System Preferences/Sound. In the sound Output, change the preference back to Internal Speakers (or whatever was your original choice). You should be able to hear sounds now from your speakers.
- Go to your saved movie in QuickTime Player, and test out the sound. Trim the clip either in QuickTime Player or iMovie.