Hi Javier, On Friday 15 January 2010 15:45:31 Javier Candeira wrote: > On Sat, Jan 16, 2010 at 1:30 AM, Paulo Assis <[email protected]> wrote: > > 2010/1/15 Javier Candeira <[email protected]>: > >> I am working with minoru3D, a dual-webcam that is really two z-star > >> vimicro webcams and a usb hub in a single package. > >> > >> I can get images from either one of the cameras using python-opencv > >> (Ubuntu 9.10, 32 bits), but when I try to capture from both cameras in > >> sequence I get this error: > >> > >> "VIDIOC_STREAMON error 28, No space left on device" > > > > It seems there is not enough USB bandwidth for streaming from both > > cameras at the specified resolution/Mode. > > > > I'm not a opencv expert but it looks you are asking for a 640x480 > > resolution, this shouldn't be a problem even for a uncompressed yuv > > stream, in any case if the camera supports MJPG could you force that > > Unfortunately the Minoru cams do not support MJPG. > > > mode instead and check if you still get the same error. Also try other > > applications (luvcview, guvcview, cheese, ....) > > I have tried running two instances of luvcview, two instances of > guvcview, one of each, one of either and one of cheese, to no avail. > > When I try to run two instances of luvcview, one with /dev/video0 and > the other with /dev/video1, the first works fine, but the second > instance exits with this error: > > kandin...@derive:~/data/work/hack/pyralax$ luvcview -d /dev/video1 > luvcview 0.2.4 > > SDL information: > Video driver: x11 > A window manager is available > Device information: > Device path: /dev/video1 > Stream settings: > Frame format: YUYV (MJPG is not supported by device) > Frame size: 640x480 > Frame rate: 30 fps > Unable to start capture: No space left on device > Error grabbing > Cleanup done. Exiting ...
Could you please set the trace parameter to 0x400 and check the kernel log to see how much bandwidth the driver requests ? You will need to use the latest driver version from linuxtv.org for that. -- Regards, Laurent Pinchart _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
