About the starting position of a display window

[schuming]

Hello everyone：
     I want to ask if I use playbin2 to creat a pipeline，how can I change
the starting position of a display window when I play a video。It seems that
the window is always be shown in the middle of my screen。 Is there anyway to
control the x-coordinate and y-coordinate of the display window？
    In some other subjects，I used to learn a concept called “Registration
point” in which way I can change it to control the starting position of a
display window，I dont know whether the playbin2 has some funtion
 or properties like this。
   BTW ，we are using gstreamer-0.10 in a mobile equipment，the library of
gstreamer-0.10 has already been transplanted in this equipment ，so some apis
in 0.11 verson cant be posiible。。。。
   Any points？
   Thanks！



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