Part 2: How to Play MP4 Files in QuickTime When It Can't Play the MP4 Files With other words, if the QuickTime misses a kind of audio or video codecs of MP4, then it will result in that QuickTime won’t play MP4 files. As a powerful audio and video player from Apple that listens to/watches the web, QuickTime 3.0 can also handle still images, animated images, vector graphics, multi-track, MIDI music, 3D, virtual reality panoramas and virtual reality objects, and of course text.Ībove all, the exact reason for the failure of playing MP4 files in QuickTime should lie in that some MP4 codecs are missing in the player. What is QuickTime player really is? Why sometimes QuickTime won’t open MP4? QuickTime is a built-in media player with powerful multimedia technology that allows you to watch Internet videos, HD movie trailers and personal media works in a variety of file formats, giving you an exceptionally high quality. Simply speaking, commonly MP4 is video format that has various audio and video codec. MP4 container video format allows users to operate on a single object, providing unprecedented interactivity. The objects are relatively independent, which improves the reusability of multimedia data. Different coding algorithms of MP4 format can be used for different objects, thereby further improving compression efficiency. MP3 is an abbreviation of MPEG-1 Audio Layer 3 MP4 is MPEG-2 AAC, which is completely an audio compression format. MP4 was originally an audio format and has little to do with MPEG-4, just as MP3 and MPEG-3 have nothing to do with it. Before we start to figure out all the questions, we had better get to know the exact meaning of MP4 format and the QuickTime. However, at times, QuickTime can’t open MP4 due to the variety of the MP4 codec.
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