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Camera preview, thin lines in the frames




Hello, list:
    I am new to v4l2.  I am working on integrating a usb camera device on
the beagleboard(Omap3530 dev board).
    Now I met a camera preview issue that is there are thin lines coming out
in the frames.
    I still have no idea how to describe this exactly. It's like the images
shows here,
    http://0xlab.org/~jeremy/camera_preview.html
    I modified capture.c sample to save the frames to picture files.  So in
my guess,  the problem is not in userspace. And this is not happen on my
laptop with the usb camera.
    Could anybody give me a clue ?  Any one would be thankful.

-- 
Regards,
-Jeremy
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