I am using IPP 5.1 media sample to decode MPEG-4 streams. I am linking to the umc libraries statically in my Visual Studio 2005 dll. I noticed on an XP SP2 dual core machine that the threads are not cleaned up right. After further investgation, I concluded that the thread leak is related to OpenMP. Every time I instantiate an MPEG-4 decoder, an extra thread starts and does not get cleaned up after I destroy the decoder. In our application, I can open a multiplexer window that shows MPEG-4 images from up to 64 streams. On closing the window, I notice that the number of leaked theads is exactly equal to the number of decoder instances. I stopped at a break point and noticed the call stack for each of the extra thread is stopped at the call _vcomp NullAPCFunc.
I tried to use ippSetNumThreads(1) right after ippStaticInit when loading the dll to disable IPP internal threading and observe the difference but it made no difference. Any ideas?
