Both hdmi(display0) and vga(display3) output a video On DM816X

Hi , i am a so newbie ...I have a trouble problem on DM8164....Now ,I have achieved run a video  via VGA(display3) on DM8164 (linux)  by this code:

devmem2 0x48140894 w 1
devmem2 0x48140898 w 1
devmem2 0x48140724 w 4

echo 0 > /sys/devices/platform/vpss/display3/enabled  
echo component,rgb888 > /sys/devices/platform/vpss/display3/output  
echo 1 > /sys/devices/platform/vpss/display3/enabled
 
gst-launch  filesrc location=/usr/share/ti/data/videos/dm816x_1080p_demo.264 ! 'video/x-h264' ! h264parse access-unit=true ! omx_h264dec framerate=24 !  gstperf ! omx_scaler ! "video/x-raw-yuv,width=1920,height=1080"  ! v4l2sink sync=false device=/dev/video2

I want to run a video and display via HDMI and VGA simultaneously.

How can Ido？please help.