As per anApple Support article, this compatibility issue is something that Apple expects.
Basic Fixes
Fix 1.
However, theres still a chance that the extension name is incorrect or mistakenly changed by you.
In such a scenario, renaming the file in the correct format name should help.
You may try the following steps on a MacBook or iMac.
Step 1: OpenFinderand navigate to the location where the file is stored.
Select theFile, right-click, and selectGet info.
Step 2: Here, check theMore infoandName & Extensionand ensure all is in order.
If you feel the extension is not what it should be, try changing it.
Fix 2.
Encode Video or Audio Files for QuickTime Player
Macs come with an out-of-the-box multimedia encoder.
Step 1: OpenFinderand select thevideo file.
Right-hit the file and select Encode Selected Video Files.
Step 2: Here, poke the drop-down arrow beside theSetting.
Once the encoding session is complete, youll spot a converted video file in the same folder.
Try playing it, hopefully, you’re able to now play it.
Fix 3.
Now, the last option is getting another video player that could play the file youre facing issues with.
To find the right app for the file, right-click thefile selectOpen WithApp Store.
Look through the available options and find the one that suits you the best.
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