I agree with you when you say that NormDiff_L2 and NormDiff_L2 and NormDiff_L1 may help, but the problem is that none of the functions TransMacroBlockIntra_MPEG4 or TransMacroBlockInter_MPEG4 is called!!!
yes, simpleplayer can be used to decode the MPEG4 stream.
ippiNormDiff_L2 usage, could you check "Example 11-11 Using the function ippiNormDiff_L1" in IPP manual. The usage of NormDiff_L2 and NormDiff_L1 is same except that they return difference norm result.