Hi Javier, On Friday 22 May 2009 09:36:32 J. Martínez Baena wrote: > Hello, > > I have a problem with 2 webcams I'm trying to get work simultaneously. I > have several models (Logitech P3000, Logitech P9000, Creative LiveCAM Optia > AF, Philips). When I plug two of them on different USB ports, then > everything works ok: I can see both simultaneously with, for example, > luvcview. > > The problem exists when I plug two of them on the same USB (for example on > frontal USB or in a USB hub). I've got the problem for combinations in wich > UVC driver is used by both cameras. I can get frames for one of them (the > first that I try), but for the second one I get a "noisy/green" screen ... > it seems as if the image is corrupted. > > However, if I put the philips and the logitech P9000/Optia it works fine. > The Philips (and logitech P3000) use a different driver than UVC. Also, I > can plug two philips webcam and they works fine. > > ¿Is this a bug or an unresolved problem of the UVC driver? ¿Is it a USB > problem?
My guess is that you're having USB bandwidth issues. As the uvcvideo driver starts capturing video on both cameras, you're not exceeding the theoretical USB bandwidth limit. However, bugs in the USB host controller, the USB host controller driver or the camera can result in corrupted data. Could you perform the same test on another computer ? Best regards, Laurent Pinchart _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
