I have downloaded mpeg4 encoder and decoder examples with ipp library from intel web. I can build them and run exe files. First I use decoder to produce a YUV420 file, then I use encoder to encode it and produce a m4v bitstream file. but I find I can not correctly decode the m4v file with decoder example. Displaying image is error. And I find the m4v file is very bigger than other codec software, compression ratio is only 10 times, I use default "stefan.par" parameter file. why?