

Change the extension of the video files which can’t be played.Update QuickTime Player to the latest version.

Please try these solutions when QuickTime Player can’t open your video files: Possible causes include: incompatible or outdated QuickTime Player, the video file is corrupted somehow, and Mac system issues. What causes this issue and how to fix it? Some Mac users said they can’t play videos in QuickTime all of a sudden. How to Troubleshoot QuickTime Player Not Opening Videos You can use the playback controls which will appear when you place the pointer over the screen to play and control your file: it allows you to fast-forward play, reverse play, and change the playback speed.

Look for the QuickTime Player app and double click on it to open.Select Applications in the sidebar of the Finder window.Locate the Finder icon in your Dock and click on it.There are some tips for using QuickTime Player on your Mac device. If valuable data get lost suddenly and you don’t have any backups of them, please visit the MiniTool official website and choose the suitable data recovery software for your system. If you think so, you’d better form a habit of backing up your files & folders regularly. Most people can’t agree more with the idea that data is the most important thing on a computer.
