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When recording in AVI on dual core CPUs appears a lot of dropped frames, although the CPU load does not achieve critical level.

This occures mainly on AMD Athlon64x2 CPUs, due to drift of the core clock counters. Programs and drivers using system call QueryPerformanceCounter, get different counter values, that causes the problem. We can't workaround this problem in our driver, because driver code that provides timestamps can not be bound to definite processor core. You can diagnose system for counters drift with the help of utility ICEAffinityTest.exe. This problem officially described by Microsoft. To resolve this problem you have to add option /usepmtimer in file boot.ini, in line with selection of your operating system and reboot PC. For example:

multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Windows XP Professional" /noexecute=optin /fastdetect /usepmtimer




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