Jacek Dylak (dylak@xxxxxxxxxxxxxx): > I am using my own software to grab images from the small black-white > camera via the simple TV card (AverMedia TvGO) with BT848A chip on > board. Using v4l API on linux kernel 2.4.20 > > My problem is that the grabbed image is whole black with some white > lines (looks like divided into 16 small frames). > > When I try it with xawtv I can see the same effect (for Composite1 > channel). But when I swicht the TV norm in xawtv settings window to > PAL-NC (from plain PAL) I can see the correct image. What is PAL-NC > norm and how can I set it programatically using v4l API - I can't find > way to do it. I think that something else is wrong, not the norm. The difference between PAL-NC and the default PAL (BG) that you should get by default does not explain the image you get. PAL-Nc is a variant of PAL found only in Argentina. It is not in the V4L1 API spec, but it is in the V4L2 spec. That said, the bttv driver you are using supports PAL-Nc as norm number '3'. Maybe you should post your code and a screenshot/image file showing what you see? -Billy
