In addition to these factors, there are other reasons why QuickTime can’t play MP4 files. You can also try to use a third-party application to repair the damaged file as there are plenty of excellent repair tools on the market around the world. All these lead to a sad situation that it can’t be played on QuickTime as a damaged one.įrom this point, you can find a splendid converter to convert the file into other QuickTime player supported formats. Or the MP4 file is completely corrupted when you copy it from unauthorized external sites. Or the file is damaged by a suddenly terminated instruction of the application when it’s operating. The video file may be damaged by missing a codec when you download it. The MP4 file may be corrupted or damaged unintentionally for various reasons. Corrupted filesĮxcept for the upper reasons, the problem that QuickTime player can’t play MP4 files on Mac probably lies in the MP4 file itself. But don’t worry, I will show you two advanced converters for handling this issue later. Hence, if your QuickTime player can’t play MP4, it is likely to be caused by compressing the file with an incompatible codec.īesides, because of the incompatibility, it will be a hard thing if you want to share your video with others in good condition via QuickTime. However, MP4 is a container for miscellaneous video, audio, and metadata.

Although QuickTime offers strong support for many formats, it is only compatible with MPEG (.mp4. If your QuickTime player can't open MP4 after you upgraded your QuickTime Player, codec compatibility is one of the key factors deserving to be considered.

But you should know in advance that it is required to purchase for upgrade QuickTime. It’s probably that QuickTime player fails to read and compress the MP4 file data because some new function can’t be operated under an outdated version. If you can’t open MP4 files on your QuickTime, you should take the version of the application into consideration first. Why QuickTime player can't open mp4 sometimes The outdated version of QuickTime QuickTime alternatives to play MP4 easily.Solutions to fix MP4 Not playing on QuickTime.Why QuickTime player can't open mp4 sometimes.

How to play a mp4 on mac