Bug is committed to premier support - posting here just to let others know, that output of H.264 encoder/decoder in 4:2:2 mode is corrupted for chroma on Core 2/Xeon5100 series and higher.
Thanks for informing here. When you link with IPP static libraries you may choose to dispatchCore2 optimized code (V8 libraries) instead of Core i7 optimized code where you discover the issue (P8). You may dispatch processor specific code with ippStaticInitCpu call.
I think it should be fixed in the latest update. Sorry, can't provide exact answer right now (do not have the issue number to check with data base).