On Tue, 18 Jun 2002 20:27:37 -0700 (PDT) Trent Piepho <xyzzy@xxxxxxxxxxxxx> wrote: > > Brooktree made a nice databook for the bt848, you should be able to download > it somewhere. In there it details the temporal decimation registers, which > let you lower the frame/field rate to whatever you want. Available at: ftp://telepresence.dmem.strath.ac.uk/pub/spec/brooktree/L879_a.pdf I have a patch to support temporal decimation in hardware. I can send you if you need it. However, 2 notes: - lots of PCI bus (if not all) are unable to cope with several bt878 cards. (I wonder if it does not come from the card itself, anyway, that can be solve in software, or maybe by using the latest PCI patch for your mobo). This problem can "black" lines to appears in the image (or no image). - temporal decimation works OK, but NOT as specified in the bt878 data sheet. I was unable to choose to decimate on frame/field (it's always FRAME) and which field is first (when I receive a frame, it's always EVEN field first! But, anyway, it reduces the needed PCI bus bandwidth. Chris: keep us informed on your sucess/failure to use your 10 cards! (I'm curious: what kind of PCI bus are you using? it's usually only 3 slots). Benoit
