On Friday 08 August 2003 11:58, Alexandre Strube wrote: > Anyway, the camera shows 4 simultaneous images (and there are models > which does up to 16) when used this windows app. What I want to do is > the same, for linux. Are they really simultaneous, or is the app multiplexing? Understand that to capture four concurrent video sources you must have four 878's (for a BT878 card). And "simultaneous" isn't really simultaneous in video, unless all the cameras are driven with the same exact sync and the propagation delays of the coax to each and every camera results in all four video signals being exactly in phase at the chip. Otherwise you need a timebase corrector for at least three inputs. Timebase correctors are expensive. More than likely the Windows app is rapidly switching amongst the inputs and displaying them in different regions of the framebuffer. Even then I would expect some jitter, unless the Windows app is doing software frame sync (very possible). -- Lamar Owen Director of Information Technology Pisgah Astronomical Research Institute
