Imxg2dcompositor

[cristiano]

Dear All, I'm struggling with the gstreamer on a SABRE iMX6 quad core. I have
prepare an image with Ubuntu 16 and compiled gstreamer iMX. I would like to
use the imxg2dcompositor to gather 4 h264 streams. 

This is a porting from Ubuntu workstation to that embedded board, using
accelerators.
 
The pipeline I have prepared, following some docs on the Network, is the
following:

/gst-launch-1.0 \
imxg2dcompositor name=c background-color=0xFF \
sink_0::xpos=0 sink_0::ypos=0 sink_0::width=400 sink_0::height=300 \
sink_1::xpos=400 sink_1::ypos=0 sink_1::width=400 sink_1::height=300  \
queue2 ! video/x-raw, width=800, height=600 ! imxipuvideosink \
rtspsrc location=rtsp://<user>:<pwd>@192.168.1.250/h264_2 ! rtph264depay !
h264parse ! imxvpudec ! queue2 ! c.sink_0 \
rtspsrc location=rtsp://<user>:<pwd>@192.168.1.188/h264_2 ! rtph264depay !
h264parse ! imxvpudec ! queue2 ! c.sink_1/

I have got to face with the following  problem: the video is black, none of
the streams is visible. 
Moreover, if I use the same stream (2 times the H264 from a same camera), it
works!

If I convert the pipe on my Ubuntu workstation (with the "normal"
compositor, and using avdec_h264) everything works like a charme.

 /gst-launch-1.0 rtspsrc location=rtsp://<user>:<pwd>@192.168.1.250/h264_3 !
rtph264depay ! h264parse  ! avdec_h264 ! queue2 ! c.sink_0 rtspsrc
location=rtsp://<user>:<pwd>@192.168.1.188/h264_2 ! rtph264depay ! h264parse 
! avdec_h264 ! queue2 ! c.sink_1  compositor name=c sink_0::xpos=0
sink_0::ypos=0 sink_0::width=400 sink_0::height=300 sink_1::xpos=400
sink_1::ypos=0 sink_1::width=400 sink_1::height=300 sink_2::xpos=0
sink_2::ypos=300 sink_2::width=400 sink_2::height=300  ! queue2 !
video/x-raw, width=800, height=600 ! autovideosink/


 
I have tried several tests to solve the problem, went to any corner of
google, but I haven't found out any interesting answer.
 
I've posted the question on the NXP iMX group too, hoping they can help me.

Btw, I have also tried the imxipucompositor: same problem.
 
Where I wrong?
 
Thank you for any advise.



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