100% CPU in QuickTime H.264 decoder on Windows on Win7, except when using XP compat. mode

Posted by user858518 on Super User See other posts from Super User or by user858518
Published on 2012-10-11T20:59:52Z Indexed on 2012/10/11 21:39 UTC
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windows-7

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Windows

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cpu-usage

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quicktime

I have a Windows program that uses the Apple QuickTime API to play video. On Windows 7, CPU usage is 100% on one core, which I believe is why the playback is choppy. If I turn on XP compatibility mode for this program, the CPU usage is around 20% of one core, and playback is normal.

Using a profiling tool called Very Sleepy (http://www.codersnotes.com/sleepy), I was able to narrow down the high CPU usage to a function in the QuickTime H.264 decoder called JVTCompComponentDispatch.

I can't imagine why there would be a difference in CPU usage when XP compatibility mode is turned off or on. Any ideas?

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