Fast screen capturing

FROM : gabriele
DATE : Sun Aug 13 08:48:31 2006

Hi,

I'm quite new to OS X development. I'm tring to find out a fast way to
capture the content of a screen or a window to create a very simple
screencasting application. I tried many examples found on this list and on
other sources but it seems these solutions are too slow to capture more
then 10 frames per second. I need at least 14-15 to have a quite-fluid
movie. I saw Snapz Pro captures screens very fast so I think I can be
done, but I dunno how.

I tried both the OpenGL way (the faster) and the Cocoa way (the slowest)
(you can found the code on cocoadev.com)

Thanks for any help,
Gabriele

p.s: there is an opensource screencasting application for OS X ?
p.p.s: VNC servers capture images at an high frame rate ?