> > I don't care about the datasheet, I care what happens in reality. If I tell > > xawtv or other V4L programs to capture in more than 768x576 all I get is a > > 768x576 picture with black borders. If I ask only 768x576 capture, the > > black borders are gone but the actual image is still the same. And even > > that is still much more than what a real TV would display. > I am still very puzzled by this whole thread. The end result of my > captures has to be square pixel, half of 704x576. I set my capture card > at 704x576 then scale down by a factor of 2 using simple software > decimation. If the correct setting were 768x576 there should be an > observable vertical stretching, no? I think that one of you has a bttv card and the other one a saa7134-based card (or something similar). The bttv driver allows capture up to 768x576, the saa7134 limits capture to 720x576. Both cards can actually capture up 768x576, but the drivers handle them differently. I assume (should check this though) that if you have the bttv card capture at 768x576, that you get some sort of black borders or borders with noise. If not, it apparently scales the image the other way around... Anyway, capturing at 720x568 should always be safe (tested on both saa7134 card and bttv card).
