I have a Matrox Meteor/RGB framegrabber card connected to a Point Grey Triclops trinocular camera (a camera with three lenses). I am using V4L2 for grabbing a stereo image (one camera for each channel, R, G and B) to get stereo vision for a robot I am developing. I am programming i C++. I have tried testing the setup with the demo software that came with the driver (Xcaptest, vcat), but I can only get output from channel 5 (RGB) when streaming with Xcaptest. Xcaptest returns an error with DQbuf if I try to grab a single image. Vcat produces no input at all from input 5. If I grab from input 0,1 and 2 (composite), I get the image from each of the lenses, but when trying to change input, run-time, I have to close the grabber and re-open it, or else the input is not changed. Does anyone on this list know how input is changed run-time without closing the opened device? The documentation states it should be able to (grabbing multiple, preset inputs), but I am unsure how this is done. If anyone knows hot to grab from input 5, please tell me! The (pseudo)code (Very snipped): FUNTCION GRABOPEN vid = open(device, O_RDWR); ioctl(vid, VIDIOC_S_STD, &vstd); ioctl(vid,VIDIOC_S_FMT,&fmt); close(vid); FUNCTION GRAB vid = open(device, O_RDONLY); ioctl(vid, VIDIOC_QUERYCAP, &cap); ioctl(vid,VIDIOC_S_INPUT,&inputVidR); R = read(vid, dataR, fmt.fmt.pix.sizeimage); close(vid); <repeated for other channels> Settings: Std=NTSC Format=320x240x32 (V4L2_PIX_FMT_BGR32, 32 because of other function libraries) fmt.type=V4L2_BUF_TYPE_CAPTURE fmt.flags=V4L2_FMT_FLAG_ODDFIELD All help is greatly appreciated! Jonas Lepsøy
