After re-launching the player, try to open & play your MP4 video again. Since the problem is with the QuickTime player so, very first, you need to close and again open the media after some time.

If the Apple QuickTime player can’t open the MP4 video file then it might… Complete Steps Way 9: Use Recommended Tool To Repair Corrupted MP4 Video File Maybe you are not able to play your video in QuickTime Player or… Complete StepsĮven after trying the above fixes, if you are still unable to play your MP4… Complete Steps This is another effective method that users are often trying when they face playback… Complete Steps Way 6: Convert MP4 Video Format To Another Format If you are still not able to open/play your MP4 clips on QuickTime player… Complete Steps

Way 5: Download The Supported QuickTime MP4 Codec Many times, it happens that we are unable to play our favorite movie on an installed… Complete StepsĬontinuously using a PC whether it is Windows or Mac OS produces some… Complete Steps Way 3: Update Or Reinstall The QuickTime Player Since the problem is with the QuickTime player so, very first, you need to close… Complete StepsĪnother simplest way which you can try to troubleshoot the QuickTime player… Complete Steps How To Fix QuickTime Player Can’t Open MP4 On Mac?įollow the below guide to learn how to easily solve the file isn’t compatible with QuickTime player MP4 file and won’t open issue. If so, just scroll down this webpage and get your answer in the next section. Now, you must be worried to know how to fix QuickTime player can’t open MP4 Mac. So, these are the major factors behind unplayable MP4 video on QuickTime player. The MP4 video that you need to open & play is corrupt.When your Mac PC is infected by the viruses or malware.QuickTime Media Player is damaged/corrupted.Thus, below we have listed the common causes: There are many reasons that can lead to MP4 QuickTime not working. But, before we dig into the fixes, it’s important to know why QuickTime Player can’t open MP4 Mac.

Can quicktime play mp4 on mac