On 20.09.2011 22:34, Pitt, Jason N wrote: > Hi- > > I have a ubuntu 11.04 machine that I'm trying to capture 12 usb webcam feeds > on. The webcams are split over 3 pcie usb cards and the motherboards's usb > controller. I'm encountering instability using both streamer and guvcview. > I can get all 12 streams running but eventually one dies (in a minute or so) > and then about 3 more die as well...leaving me with 7 or 8 stable streams. > What is the limitation? The guvcview error is: > > Could not grab image (select timeout): Resource temporarily unavailable > > > which is repeated repeatedly.... > > > the streamer error is: > v4l2: oops: select timeouts > > this usually only effects one or two cameras > > > > with both programs dmesg yields: > > [ 5330.048166] uvcvideo: Failed to resubmit video URB (-27). > [ 5330.048174] uvcvideo: Failed to resubmit video URB (-27). > [ 5330.048178] uvcvideo: Failed to resubmit video URB (-27). > [ 5330.048183] uvcvideo: Failed to resubmit video URB (-27). > [ 5330.048188] uvcvideo: Failed to resubmit video URB (-27). > > > I only need to capture an image from every camera every 2.4 seconds, if > someone can provide me a good work-around I'd appreciate it! >
Hi, usb controller or usb device is usually responsible URB errors. -27 is th error number. You can find it in include/asm-generic/errno-base.h 27 is EFBIG in this case, then in Documentation/usb/error-codes.txt you can find description of this error. "-EFBIG Host controller driver can't schedule that many ISO frames." I currently do not know if usbcore itself do not allow so many ISO frames, or only one controller can't handle it. Are there any system in this error? I mean do cams day on one controller or only one per controller? Regards, Alexey _______________________________________________ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
