If you can‘t install the QuickTime MPEG-2 Playback Component

The QuickTime MPEG-2 Playback Component can't be installed in OS X Lion or later.

QuickTime Player in OS X Lion or later can play back MPEG-2 media without additional software. It works with most non-encrypted MPEG-2 file formats containing MPEG layer I or II audio, including .mpg, .mpeg, .m2v, .m2a, and .m2s files.

If the QuickTime MPEG-2 Playback Component is already installed when you upgrade to OS X Lion or alter, the component remains available for use by older QuickTime 7-based applications.

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