colour shift in DSP application on AM57xx

Hi experts,

I got colour shift (I see a green video) by trying following command from http://processors.wiki.ti.com/index.php/DRA7xx_GLSDK_Software_Developers_Guide#Running_DSP_sample_applications 

root@am57xx-evm:~# yuvcopytest -s 30:800x480 /run/media/sda1/176x144.yuv -w 176 -h 144
0x2b070: Opening Display..
using 1 connectors, 800x480 display, multiplanar: 1
width = 176, height = 144

Setting mode 800x480 on connector 30, crtc 32
Fill input buffer with yuv luma data

0x2b070: Opening Engine..
Comparing output buffer with input buffer

yuvcopytest executed successfully

root@am57xx-evm:~#

I got the same result no matter I try YV12 or NV12...

Did you know why??

Thanks.