Video Overlay and capture.

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Hi.
I am trying to understand if I can , at the same time,
overlay at least one channel to the videocard and
capture it if I want.
Just reading the V4L-1 API didn`t helped me to
understand why some win32 programs do full frame rate
overlay and capture at the same time. Could it be an
OS specific resource ?
BTW, why does clipping means, in the overlay context ?
It does automatic "cut" if the image area is smaller
than the capture ?
Thanks in advance.

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