Aug 102012

The Issue

With the release of Mountain Lion, many OS X 10.8 Lion users only to find that when they play MKV, AVI, MP4 or any video files with AC3 stereo audio, AC3 5.1 surround with Perian Player, no sound is played, only the video portion is played.

Interesting thing is if you convert the MKV, AVI to MP4 or M4V and passthrough the AC3-audio, the QuickTime 7 can play the file fine.

In fact, it is not strange at all if you get to know that Dolby Digital audio AC3 is a paid audio codec. QuickTime has got an ac-3 decoder from Apple, but other apps like VLC, Perian can’t use the AC3 codec due to copyright issue.

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