Re: xawtv and v4lctl with usbvision kernel driver
Devin Heitmueller wrote: > On Mon, Nov 16, 2009 at 10:01 AM, Sietse Achterop wrote: >> Context: >> debian/lenny with usb frame grabber: >> Zoran Co. Personal Media Division (Nogatech) Hauppauge WinTV Pro >> (PAL/SECAM) >> This uses the usbvision driver. >> >> The problem is that while xawtv works OK with color, v4lctl ONLY shows the >> frames >> in black-and-white. > I don't know about that board in particular, but on some boards the > composite and s-video are actually wired together (sharing the luma > line), so if you have the device configured in "composite" mode but > have the s-video plugged in, then you will get a black/white image > (since it expects to see both luma/chroma on the one pin that provides > luma). Hi Devin, Thanks for your reponse, but xawtv happely shows color, so I don't think thats the issue, Thanks again, Sietse -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
xawtv and v4lctl with usbvision kernel driver
Dear all, Context: debian/lenny with usb frame grabber: Zoran Co. Personal Media Division (Nogatech) Hauppauge WinTV Pro (PAL/SECAM) This uses the usbvision driver. The problem is that while xawtv works OK with color, v4lctl ONLY shows the frames in black-and-white. I understood that the usbvision driver needs some attention, e.g. a command like "v4lctl setinput 2" is not working, it will keep using setting 0. Because I need 2 (S-video) I patched the driver to always use 2 by setting channel=2 in "usbvision_muxsel" to permanently select that channel. With that usbvision module loaded I am getting pictures, but in BLACK_AND_WHITE, as mentioned. When starting "xawtv", it works fine! With a simple opencv application I do an CvCapture* capture = cvCaptureFromCAM( cnum ); ... cam = (CvCaptureCAM_V4L*)capture; ... ioctl(cam->deviceHandle,VIDIOC_G_FMT,&format)) ... and find that the format is YV12, but the picture is black-and-white. But YV12 is a color format. The question is, how to get proper color pictures when using v4lctl or other simple applications with this driver. Thanks in advance, Sietse Achterop -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
