So this is one of the easiest ways you can record screen and audio at the same time. Go to your saved movie in QuickTime Player, and test out the sound. Trim the clip either in QuickTime Player or iMovie.You should be able to hear sounds now from your speakers. In the sound Output, change the preference back to Internal Speakers (or whatever was your original choice). At the top of your screen, click on the black square, which is the button to stop the Quicktime recording.After you’re done recording s top the video in your application that was playing your video.Go to the application that was set to play the video and then press play.Choose the appropriate audio source, in our case, the Loopback Audio software.Choose if you want to record all your screen or a portion of your screen, then click on the Record button.Go to the QuickTime Player application choose File/New Screen Recording.After doing this you will hear no sound from any of your Mac’s applications because the sound will be recorded with the Loopback software.Then in the sound Output, choose Loopback Audio in the Output option. 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.

Open the media you want to screen capture in your application (if it’s a browser, use Firefox or Chrome.Install loopback audio software on your Mac.

Quicktime record screen and audio