You can take the regular way to shut down your Mac. When you get the QuickTime Player won't open issue, you can try restarting your Mac first to solve the problem.
In that case, when you run the program, the video playing window won't appear on the desktop. Various reasons will cause the QuickTime Player won't launch problem, such as a corruption in the macOS, or in the files associated with the QuickTime. How to Fix QuickTime Screen Recording Errors How to Fix QuickTime Player Can't Open MOV/MP4 File
Perhaps Apple will restore some of the more advanced functionality down the road in a future update to QuickTime X, but for now it’s certainly nice to have the option to run the older, feature rich, and still very functional, 7.6.6 release. Many of the features of 7 like screen recording, audio recording, and trimming have been brought into version X, while simple conversion, encoding, and export features have been adopted by OS X Finder instead, which is great, but having a single video playing and editing app is preferable for many Mac users, and often iMovie doesn’t quite fit that bill. In some ways, using QuickTime Player 7 is actually easier to use than iMovie for making simple movie edits and adjustments to videos, which makes it disappointing to have lost many of the 7 features in the transition of the app to version X. It’s a lot like the adjustment tools that are built into the Preview image editor in OS X, but obviously they’re for video instead, allowing you to make viewing and sound edits without any complexity at all. My personal favorite aspect of version 7 is the AV panel, accessible from the Window menu by selecting “A/V Controls”. For those familiar with the older version, you’ll instantly know and appreciate the differences, though to unlock it’s full potential you really need the Pro version. Go ahead and launch the QuickTime Player 7 app, you can even run it alongside QuickTime Player X if you want to.
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