
Under this circumstance, you may receive the message that "the movie could not be opened" sometimes. However, there are some MP4 videos that can't be recognized by QuickTime. Part 1: Why Can't You Play MP4 Video Files on Mac with QuickTimeĪs Apple's default media player, QuickTime can provide you the easiest way to play MP4 video files on Mac because it is part of the operating system. Part 4: FAQs about How to Play MP4 on Mac.Part 3: How to Play MP4 on Mac with Video Converter Ultimate.Part 2: How to Play MP4 on Mac with Free Online Video Converter.

