I believe that the uncompressed 4:2:0 output of the sample_decode project is not as described at http://www.fourcc.org/yuv.php#NV12 or as descibed in the IPP documentation (consistent with the description at fourcc). The output is actually three planes: a Y, followed by a U then a V plane. Not (as described in the documentation) a Y plane followed by a lane of interleaved U/V samples.
Can someone confirm this?
PS - This may be the issue with using the ipp resize as in a previous post.