webcam USB vs webcam built-in

Hello everybody,

I've the following problem:

I'm just using the capture.c example from video capture
example<http://v4l2spec.bytesex.org/spec/capture-example.html>( in
http://v4l2spec.bytesex.org/ ).

If I run the executable file on my laptop with its built-in webcam
everything works fine!
But if I try to use a USB webcam the images is really bad! (I attach one of
them!).

Somebody can show me if I have to change some parameters on the code?

(I'm sure USB webcam is not broken ;) )

Thank you very much!

-- 
-Cristiana

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