Click on Quicktime Player and then select “update.” That will give you a list of all the installed applications and what updates they have available. If you’re running the program on a Mac, go into the App Store application and then click on the updates button. ![]() If you happen to be running an outdated version of Quicktime Player you can update it quite easily. If not, continue reading for some other solutions. Then check to see if your MP4 file will open now. Once the program is closed, wait a few moments and open it back up. To restart your program, go to the Quit option from the drop-down menu in the top bar when Quicktime Player is open. The first way to do that is by restarting the program and/or computer and seeing if it resolves the issue. If you’re experiencing issues when opening an MP4 file, it’s a good idea to start with a small fix and work your way up from there. ![]() Quick Fix #1 – Restart the Program and/or Computer ![]() Unless the file is completely corrupted, you can typically get things fixed pretty quickly. ![]() There are also other errors that can occur with software updates. It could be as simple as a small, easy-to-fix glitch or as complicated as a completely corrupt file. There’s no one exact reason why an MP4 file might not open for you in Quicktime Player.
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