How can I install my favorite video on screensaver in macOS?
Initially in macOS you cannot use any video as a screensaver. To do this, you will have to install a special extension.
How to set up a new screensaver with your video
2. Mount the downloaded image, launch the screensaver and confirm its addition to the system.
3. Re-enter the System Settings – Desktop and Screen Saver – Screen Saver .
4. Select the SaveHollywood screensaver and click Screensaver Settings .
5. Select the folder containing the desired clips and save the settings.
Now clips from the folder will be played as a screen saver when the computer is idle.