[Linux-uvc-devel] Connecting multiple cameras
Linux UVC driver and tools
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From: David M. <dc...@MI...> - 2006-03-16 06:33:20
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Hi, I'm interested in connecting more than one camera at once, specifically, a pair of Logitech Quickcam Pro 5000s. I only have one at the moment, but when I run it at full uncompressed resolution (640x480x30fps YUV), it chooses an ISO endpoint with a packet size of 3060 bytes. This is more than half of the available ISO bandwidth. (cat /proc/bus/usb/devices claims it's 60% -- I expected more than half, but not quite that much). Obviously, this would prevent me from using more than one camera. By my calculation, 640x480x30fps YUV should take 2304 bytes minimum per microframe. So why can't the Quickcam choose its next smaller ISO endpoint, which is 2688 bytes per microframe. This would probably put me at less than 50% of the ISO bandwidth? Do you think this is a hardware limitation of the Quickcam, or is there some driver involvement in this decision? Thanks, David |