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Possible root causes could be malware or virus issues, file damage, network interruption while downloading the file, issues caused by wrong video processing, and your player not supporting the file format. All of these are common and possible reasons for videos not playing on Mac.
Why can't I open a video on my Mac?
If you face a 'video not opening' issue on your Mac, this means your video is either corrupted or missing a codec. You can fix this issue by trying different measures like scanning your Mac for malware or reinstalling Adobe Flash Player.
Why can't I watch MP4 videos on my Mac?
You cannot play MP4 on Mac, if the codecs used in your video file are missing. Issues like QuickTime player has no sound on Mac when playing MP4 file or audio lag are usually due to incompatible codecs. So download MP4 codecs on Mac to fix the issue.
