Step 3: Go to the First Aid tab and click Repair Disk Permissions button. Step 2: Go to the boot disk volume, which is used to store system and built-in apps. Step 1: Open the Disk Utility app from the Applications folder. If you receive the message said QuickTime Player quit unexpectedly, follow the steps below to fix it. Some users reported that QuickTime is not working when screen recording iPhone. Part 2: How to Fix QuickTime Screen Recording Not Working Solution 1: Repair Disk Permission Then you can play more video formats in QuickTime. You can search for QuickTime codec page in Google, download and install the proper one.

Convert your video files to QuickTime supported formats, like MOV.Look for another media player, such as VLC.If your video does not play in QuickTime, you have three options: The multimedia formats compatible by QuickTime are MOV, most MPEG files, some AVI and WAV files.

QuickTime is not working partly because your video formats are not compatible. Step 3: Wait for the process to finish, reboot your computer, and open your videos in QuickTime again. Step 2: If there is an updated available, click the Update Now button and follow the onscreen instruction to install it. Step 1: Click the Apple menu, go to System Preferences and choose Software Update.

When QuickTime is not working on Mac, the first thing you should do is to update your software. Part 1: How to Fix QuickTime Not Working When Playing Video Solution 1: Update Software Part 3: FAQs about QuickTime Not Working.Part 2: How to Fix QuickTime Screen Recording Not Working.Part 1: How to Fix QuickTime Not Working When Playing Video.

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