MP4 and M4A File Support

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MP4 files are the common name (based on the regular file extension) for MPEG-4 Part 14 container files). Put simply, MP4 files are a modern file format that serves a similar purpose to AVI files and other audio and video container formats (but provides new features not available in older formats).

M4A files are simply MP4 files that contain only an audio stream (usually AAC encoded). There is no difference between a M4A file and a MP4 file other than the file extension. In fact, the M4A extension was actually not part of the original MP4 "specification" but was invented by Apple to differentiate audio-only MP4 files from video MP4 files. Other common MP4 extensions include: M4V (for video), M4P (for MP4 files "protected" with Apple's DRM system), 3gp (for Mobile Phones), and M4B (audiobooks). All of these different file types are really just MP4 files "inside" (though 3GP files are special simplified MP4 files).

Enabling MP4 Playback in MC

In order to play these files back with MC you need to have either:

  • Apple's Quicktime Player installed
  • proper DirectShow filters installed, and you need to enable DirectShow M4A support in MC

Generally, using DirectShow for playback will give better results for M4A files in MC12. DirectShow playback allows MC to use visualizations on the files, to natively convert the files to other formats, and a number of other features not available with Quicktime-supported file types. However, because most new users have Quicktime already installed (while they may not have proper DirectShow filters installed to support MP4 decoding), MC disables DirectShow support in favor of Quicktime by default. This is easy to change though!

Enabling MP4 Playback Using Quicktime Player's Engine

Uncheck both M4A and MP4 in the DirectShow Playback Settings dialog box in order to enable playback of these filetypes using the Quicktime engine.
further information: DirectShow Playback Guide: Apple Quicktime Player

This couldn't be simpler. Simply install Apple's Quicktime Player, which is available free of charge from Apple for a variety of platforms.

Installing Quicktime can sometimes create more problems than it solves because of some of the default settings the application uses when you install it. All of these annoying qualities can be mitigated or eliminated by being very careful as you proceed through the installation process, and by taking a few steps after the installation is complete. For a detailed guide to installing Quicktime in the least annoying method possible, refer to the Quicktime Installation Guide at

Then you also need to tell MC to use Quicktime (rather than DirectShow) to play these file types back. Simply go to Tools --> Options --> Playback --> DirectShow Playback Settings and uncheck M4A and/or MP4 in the DirectShow Filters list.