> > I am pretty sure the operation of bttv is correct. The problem comes > > in, because bttv will capture the ENTIRE video image (including the > > half-line scans). Many broadcasters transmit some information (looks > > like a timestamp to me) in the first half of the first visible display > > line, and this is probably what you are seeing. Analog TVs cut off the > > top, bottom, and borders of the visible image, so you don't usually see > > this. > > This doesn't explain why "grabdisplay" is different from "overlay". bttv can handle both overlay and capture at the same time if both are small enouth that one field is enouth. It does this by splitting even and odd fields. This has the side effect that overlay and grabdisplay are slightly different because overlay uses the odd field and capture (i.e. grabdisplay) the even one. Gerd
