Playing .mkv files in QTX/QT7 video works fine, sound is distorted.

What I'm trying to do is open some .mkv files in Quicktime 7 so that I can export it as an mp4 with AAC audio (instead of AC3, 5.1). The audio during playback ends up sounding like a helicopter or what you'd hear if you stuck a piece of sandpaper in a box fan. When I play the files in VLC the audio is as it should be. I'm at a loss as to what the problem could be. I have version 1.2.1 of Perian installed as well if that helps at all.

It could be a 'difficult' form of Matroska file. FYI Matroska is just a container like MOV or AVI, and some mkv have the video encoded with Real Video Codec (RV9 RV10). Perian+QT can't decode this, but VLC will play .mkv files just fine on OS X, as long as they don't use H.264!
It's a bit of a lottery until Matroska decide to support the Apple platform. I have found this:
http://mkv4mac.free.fr/index.php?lang=en&p=lec
which may help.
But there may be another workaround: 1. Get Info the mkv file
2. Change to extension to wmv. Save as wmv and that could work better.
Or this link may be helpful:
http://www.squidoo.com/mkv-converter-mac
Recently, a poster (ZachP14) suggested this:
"There's a program called Plex that runs .mkv files awesome on my 2.0 ghz macbook."
http://www.plexapp.com/
Maybe worth a try?

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