Reply to the mail from Gleicon Moraes (gleicon@xxxxxxxxxxxx): > Hi. > > That page stats what we all already know: they are selling a > surveillance system that can be expanded, and claim that you can get 30 > fps from each board. > It`s hard to tell you if it is made in Brazil or outside, but seems like > a very common bt878 designs. > I saw some Win32 based software give, or at least do a good mimic, high > framerates. Usually they dont peak at 30 fps, but the visual effect is > very convincing. I dont know if they work with a kind of interpolation, > spliting the ood and even fields and building distinct images... > Personally, I can understand the input sync problem and why we can`t get > more frames per second while capturing and changing inputs. > But it sure does bother me. I`ve never put my hands in the source code > for a driver or application under Win32, because usually its closed > source or need the proper N.D.A. signed. To get high frame rates from multiple inputs on a single Bt878, the sources have to be synchronized ( ie. all cameras start to capture a frame at the same time ) to reduce settling time. Also the card would need a faster multiplexer than the Bt878 provides. There are some cards with external multiplexers which act faster and allow fast switching of the inputs. If you are interested in a Bt878 driver for windows, look here: btwincap.sourceforge.net This driver is GPLed. -Arne
