How to record the screen of your Apple TV4 / 4K without any cable:
1. While on the same WiFi network as your Apple TV, go to Applications and open QuickTime. 2. Now when the application is running, click on the FILE tab on the taskbar and select ‘New Movie Recording’. You’ll immediately see the QuickTime application using the facetime camera on your Mac to record a new movie.
3. Now, click on the small down arrow right next to the red record button. You’ll see a drop-down menu. Select ‘Apple TV’ under the head ‘camera’.
4. Now you’ll see a 4 digit passcode appearing on your AppleTV screen. Use the code on your Macbook to connect to the Apple TV wirelessly.
5. The Apple TV will ask for a confirmation to share the screen. Press the Record button and you are good to go. While you are at it, you can also take screenshots of your Apple TV using this method.