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why can't display picture in picture simultaneity in dm355?

Hi , I want to used video0 and video1 to display pictures simultaneity, the fbdev devices are:

#define FBVID_DEVICE    "/dev/fb/1"    //video0
#define FBPIP_DEVICE    "/dev/fb/3"     //video1

the video0 size is vga,and the video1 size is qvga,and the video1 position is  in left bottom。Now ,i can see the part  picture in the video0 whick been cover with video1 , and the vide1 is black,why can't picture been display in video1?

If  I send datas to video0 or video1 only ,pictures can been seen ok!