how to save a screenshot (or a frame) from a camera stream

[arzo]

Hello, 
I am trying to save jpeg (or bmp), while displaying the screen
simultaneously. 

I have written following code: 
(can be compiled after *getting* 
*compilation: *

*linker:* 

*application code: *


The problem is i get triple repeated images in result (after pressing gtk
button). 
I attach example photo here:
http://img854.imageshack.us/img854/4541/picture1dkz.png 

Do you have any ideas can I deal with this problem? 



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