Apple support recommended to reinstall macOS but I suppose it doesn’t help.įor those people who have the same issue when playing MP4 video with QuickTime player after upgrading your Mac computer to the new macOS Sierra, you can fix the problem with the following solutions: Solution 1: Convert unsupported MP4 directly with QuickTime player VLC player can play the MP4 file but QT doesn’t. Even my iMac with Sierra can play it but not my MacBook. I have the same problem on MacBook Air HD5000. Codec of video is h.264 and sound AAC. Does anybody have the same problem or have any ideas how to fix it? Hi, I found that QuickTime player doesn’t play mp4 videos after I updated macOS Sierra. Macos Sierra QuickTime no video just sound
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