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why decode_display_a8host_debug.xv5T block when output to ypbpr display?

HW:DM8168

SW:EZSDK5.3.1.15

why decode_display_a8host_debug.xv5T block when output to ypbpr display? But the hdmi output  is OK!

root@dm816x-evm:/home# ./decode_display_a8host_debug.xv5T  -i 1080P_HP.h264 -w 1
920 -h 1080 -f 60 -g 0 -d 1 -c h264
input file: 1080P_HP.h264
width: 1920
height: 1080
frame_rate: 60
gfx: fbdev disable
codec: h264
display_id: 1
Decoder-Display example
===============================
OMX_Init completed
UIAClient is ready to send a UIA configuration command
UIAClient received UIA_CONFIGURE_ACK
UIAClient is done sending requests
UIAClient is ready to send a UIA configuration command
UIAClient received UIA_CONFIGURE_ACK
UIAClient is done sending requests
opening file
decoder compoenent is created
PADX: 32 PADY: 24
level set is 12
scalar compoenent is created
set input port params (width = 1920, height = 1080)
set output port params (width = 1920, height = 1080)
set number of channels
set input resolution
set output resolution
enable scalar input port
got eventEnable/Disable Event
enable scalar output port
got eventEnable/Disable Event
found handle 0x13af58 for component OMX.TI.VPSSM3.VFDC
got display handle
found handle 0x13ea60 for component OMX.TI.VPSSM3.CTRL.DC
Buffer Size computed: 4147200
set input port params (width = 1920, height = 1080)
setting input and output memory type to default
enable input port
got eventEnable/Disable Event
connect call for decoder-scalar
connect call for scalar-display
decoder inport buffers allocated
decoder outport buffers allocated
got eventState changed to: OMX_StateIdle
state IDLE
Scalar input port use buffer done
scalar outport buffers allocated
got eventState changed to: OMX_StateIdle
scalar state IDLE

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