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how to display video input

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DSB
DSB 2017-4-20
编辑： DSB 2017-4-20
i'm trying to display real-time video in gui it doesn't display the camera is working but display nothing
Here's my code
handles.output = hObject;
axes(handles.axes1);
vid=videoinput('macvideo',1);
imaqhwinfo(vid);
preview(vid);

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