hepl needed

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Hi, I am totally new to V4L. Currently I am woking on a project whcih will use two Philip 740 toU USB cam. I need use QT or other GUI tools to show the image obtained from the cams. I can use V4L interface to query the cams, but I don't know how to show them in the window. How can I connect the v4L API to the GUI. Is there a simple example I can study?
 
Thanks
 
LI

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