Hi Justin, this is probably bug in uvcvideo. Theoretically it should allow you to run only 2-3 cams independent of type.
Am Donnerstag, den 09.06.2011, 09:56 -0400 schrieb Justin Piszcz: > > On Wed, 8 Jun 2011, Justin Piszcz wrote: > > > Is there anyway around this? > > When using 5 different webcams, no problems. > > When using 4-5 webcams of the same type, only 2 of 5 work. > > > > [ 832.218440] uvcvideo: Failed to submit URB 0 (-28). > > > > I also tried with uvcvideo quirks=128. > > > > Why is this? > > > > Anyhow, I found a workaround: > > > > [ 1183.054874] uvcvideo: Probing generic UVC device 6 > > [ 1183.054908] uvcvideo: Found format MJPEG. > > [ 1183.054916] uvcvideo: - 160x120 (30.0 fps) > > [ 1183.054922] uvcvideo: - 176x144 (30.0 fps) > > [ 1183.054927] uvcvideo: - 320x240 (15.0 fps) > > [ 1183.054933] uvcvideo: - 352x288 (15.0 fps) > > [ 1183.054938] uvcvideo: - 640x480 (15.0 fps) > > [ 1183.054943] uvcvideo: - 800x600 (15.0 fps) > > [ 1183.054949] uvcvideo: - 960x720 (10.0 fps) > > [ 1183.054955] uvcvideo: Found format YUV 4:2:2 (YUYV). > > [ 1183.054961] uvcvideo: - 160x120 (30.0 fps) > > [ 1183.054966] uvcvideo: - 176x144 (30.0 fps) > > [ 1183.054972] uvcvideo: - 320x240 (15.0 fps) > > [ 1183.054978] uvcvideo: - 352x288 (15.0 fps) > > [ 1183.054984] uvcvideo: - 640x480 (15.0 fps) > > [ 1183.054989] uvcvideo: - 800x600 (15.0 fps) > > [ 1183.054994] uvcvideo: - 960x720 (10.0 fps) > > [ 1183.055000] uvcvideo: - 1600x1200 (5.0 fps) > > > > I can use MAX: 2 devices of the same type with YUV 4:2:2. > > I can use MAX: at least ?? more devices of the same type with MJPEG. > > > > Now I see some weird banding or video artifacts, digging further (w/MJPEG). > > Why is there a problem using > 2 of the same device with YUV 4:2:2? > > > CC'd motion-user@ list to see if there is a 'proper' way to support > 2-3 > web cams. > > So far I have 1 PCI-e USB card with 4 ports and the system motherboard > itself and the motherboard headers, I am able to use 3 of the same camera, > but beyond that it says Failed to submit URB 0 (-28). > > I would like to use YUV 4:2:2 (YUUV) 1600x1200 for all 4 cams, would this > be possible? > > Right now I am able to use as many cameras as I want, as long as there > are not more than ~2 of the same type: > > Bus 001 Device 003: ID 046d:0809 Logitech, Inc. Webcam Pro 9000 > Bus 002 Device 004: ID 046d:0990 Logitech, Inc. QuickCam Pro 9000 > Bus 007 Device 002: ID 0471:0311 Philips (or NXP) PCVC740K ToUcam Pro [pwc] > Bus 002 Device 005: ID 046d:08b2 Logitech, Inc. QuickCam Pro 4000 > Bus 003 Device 004: ID 046d:08b2 Logitech, Inc. QuickCam Pro 4000 > Bus 003 Device 005: ID 046d:0809 Logitech, Inc. Webcam Pro 9000 > > Thoughts? > > Justin. > > _______________________________________________ > Linux-uvc-devel mailing list > Linux-uvc-devel@lists.berlios.de > https://lists.berlios.de/mailman/listinfo/linux-uvc-devel -- Regards, Alexey _______________________________________________ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
