> From the look of that loop you can probably blame that on me! (my > example code) > > Try swapping the order of the SYNC(nFrame) and CAPTURE(1-nFrame) pairs > of lines - that way there'll always be a "queued" capture, and you > shouldn't lose any frames assuming your processing isn't taking too > long. > > Ben Thanks, works - but I don't really know if it is a problem. I move the code to the pure c++ and the frame rate was 25 FPS, as it should be. But when I use it together with the Qt classes it slow down to 12 FPS. Somehow using Qt influnce video capturing performance. I don't why - maybe somebody have any idea on this? Jacek
