Reboot the computer and delete the cache bundle for the library. The file can be damaged or corrupted and that is why you can’t open it on Mac. Open one of the clips in the QuickTime player and report what it says in the information window. Last but not least reason why QuickTime can’t open MP4 on Mac is the file state. So check whether you are using the updated version as some functions can’t be operated under an outdated version, that is why cursing issues with playing MP4 on Mac. If that happens, your app won't open the file or won't play back its audio or video"Īmong the other possible reasons is also the outdated version of QuickTime. Although it is a proprietary of Apple, it runs on both MAC and. It uses an algorithm to compress video and audio. "Older or specialized media formats might not work in your app, because the format requires software designed to support it. This video extension is developed by Apple. So if you face the issue that your QuickTime is unable to playback MP4, most likely the file was encoded using a different standard. In general, QuickTime is able to handle MP4 files that are encoded with MPEG-2, MPEG-4, and H.264. The main reason why QuickTime can’t always play MP4 videos on Mac lies in the format encoding difference.
Why Can't QuickTime Player Open MP4 file on Mac?
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