Re: [Linux-uvc-devel] Quirk for mjpeg bandwidth

[Sebastian Arcus]

On 31/10/11 23:14, Sebastian Arcus wrote: I seem to recall some discussion about a hack/patch/quirk to get several of the newer HD cameras to work in mjpg mode on a single usb hub/bus. Does anybody know if this has made it into the uvc driver, and if yes, after which version. Just to clarify, I am after the patch which tries to overcome the cameras requesting too much bandwidth in mjpeg mode - not regular yuyv. I believe some of the original discussion referred to a Logitech C910. I need to run four MS Lifecam Studio's on the same usb root hub in 800x600 / 10fps mode - if possible. I believe there should be enough bandwidth - if I can just convince the cameras and the uvc driver to play together somehow. Many thanks in anticipation, Sebastian Bump. Anybody? It would be really nice if there was a quirk which just allowed the specification of a fixed bandwidth at user's choice, on loading the kernel module. Thus, one could find out through trial and error, by using different numbers, what bandwidth can be used with a certain camera model, at a certain resolution and fps - on mjpeg. I suspect this would break the standard, but there seems to be no other way to make an increasing number of really good quality HD cameras work on multiple camera setups - although the numbers indicate there should be enough bandwidth to make even 4 of them work at the same time, on same usb root hub, in mjpeg streaming mode. Any contributions much appreciated. Sebastian

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