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Media player corruption can prevent sound from playing. Mac Media players may occasionally become corrupted or can't open MP4 files as a result of unnecessary operating system updates. Mac Media player corruption can result from faulty or inappropriate installation. The other one is the MP4 file you are using may be corrupted. There are 2 main reasons, and one is the Mac media player is problematic. As a result, it becomes quite difficult for them to initially detect the issue. The majority of users are not familiar with codecs. You might have this issue if any codec on your device does not function properly with any media file. The bulk of the time, a software problem is to blame. The majority of people believe that their Mac's MP4 failures are some of the hardware issues. However, as we'll see in this piece, there's always a chance to fix damaged MP4 files on a Mac. File corruption, malware assault, or incomplete video transfer can harm MP4 videos, often as a result of incorrect video management. Like this Mac user, You frequently get the error " MP4 no sound on Mac" when attempting to play MP4 video files in any media player. After a brief interval, the video returns to the laptop, and the Apple TV now plays the audio." I pick Apple TV as the output by clicking the Sound Pref Pane button. On TV, there is video but no sound (on TV or laptop). But certain files exhibit the following behavior: In Quicktime, click Apple TV / Airplay. " I can view several QuickTime files on my retina MacBook Pro running Sierra 10.12.6 on Apple TV, and the sound is good. PAGE CONTENT: What Causes MP4 No Sound on Mac How to Fix Mac MP4 File Has No Sound Issue Settings Should Check About MP4 No Sound on Mac