Thus, if we meet with the problem that QuickTime refuses to play some kind of MP4 files, all we need to do is convert the MP4 files into the format suitable for QuickTime Player.Īlthough most of MP4 files are available to play with QuickTime in Mac & PC, some incompatibility issue may still be unavoidable. However, in some cases, you still probably come across the error message like 'the movie could not be opened' when you try to open a MP4 file WITH QuickTime player. QuickTime can play most of MP4 videos with MPEG-4, MPEG-2, H.264 video codec and MP3, AAC codec. However, not all formats are treated equally. It supports a lot of media formats and codecs.

mp4 file can't be opened and prompts you to download additional codec to open it.Īs we know, QuickTime Player is developed by Apple and is the default player pre-installed in Mac operating system. Sometimes you may feel confused when the video ends in MP4 file extension, but the Apple QuickTime player just says that the. However, the incompatibility of formats can still be a problem now and then. There are innumerable file formats as well as codecs in the multimedia world.

Play mp4 on mac