Hd content won't play in itunes properly

I am trying to play 720p & 1080p content in itunes on my macbook pro.  The itunes library is on a firewire 800 external drive.  The videos play fine in quicktime player, but when I try to play hd video in itunes the framerates slows down so much as to be unwatchable but the audio plays fine.  I've tried taking out all the plug-ins for both itunes and quicktime.  I turned perian off.  Nothing seems to help.  The same videos play fine in other programs (quicktime player, vlc, etc.) but in itunes the video is unwatchable.  SD videos play with no trouble.  I tried playing a movie I bought from the itms and that played mostly, it was a little slow.  But podcasts and videos I have encoded myself will not play.

Hi
I have the same problem. Any solution yet? I would like to play hd videos in iTunes on my late 2012 iMac.
Take care

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