Dear Paulo, Paulo Assis wrote: > Hi, > I tested this in my system and was able to grab two simultaneous YUYV > 1600x1...@5fps video streams. > The cameras are two different uvc logitech models connected to two > separate usb controllers, my board has plenty of them :) > Connecting both cameras to the same controler (e.g. the two front > ports) will cause the second stream to fail. > it turned out that the computer on which we need to run the application has also two separate USB controllers. The output of the second controller was hidden on the motherboard and was not connected to the USB connectors on the case so I needed some cables to connect it. The important is that when cameras are connect to these separate USB controllers IT INDEED WORKS in the highest resolution. Thanks a lot for the hint.
> I don't know about windows since I don't use it, but are you sure you > aren't getting a zoomed (1600x1200) image from a lower resolution? > maybe the windows driver is playing a trick on you. > Well, this is still an open question. I'm sure that the computer I used has just a single USB2 controller. I tested the cameras in an original Logitech software which allows to setup all camera modes. I would assume that if one selects 1600x1200 YUYV then the software will use this exact setting though in Windows one never knowns... It is true that there was also other "suspicious" modes with resolution higher than 1600x1200. Now when it runs in Linux I don't have a motivation to investigate this more. Thanks again for your help. Best regards, Vojtech > BTW with some new camera models that support MJPG in high resolution > you should able to squeeze two MJPG 1600x1...@10fps video streams from > the same usb controller. > > Best regards, > Paulo > > > 2009/11/8 Vojtech Franc <xfra...@cmp.felk.cvut.cz>: > >> Paulo Assis wrote: >> >>> Hi, >>> >>> >>> >>>> It seems to be a problem on the driver's side. >>>> >>>> >>> No, this is a usb bandwidth problem ( not enough :D ) >>> >>> Did you plug the cameras into the same usb controller ? >>> >>> Try using different ones, one for each camera, usually for desktops >>> the front ports use a different controller from the back ones. >>> >>> Best regards, >>> Paulo >>> >>> >> Dear Paolo, >> >> thanks for reply. I tried to run my Logitech cameras in Windows XP and >> Ubuntu using exactly the same hardware (I have double boot on my >> notebook). Since in Windows it runs (2 x Logitech Pro9000 camera at >> 1600x1200/YUV) without problems means that it is not the (hardware) >> bandwidth problem as you mentioned. >> >> I also found out that both cameras are connected to the same USB 2 >> controller regardless to which physical port it is plugged: >> $ lsusb >> Bus 005 Device 004: ID 046d:0990 Logitech, Inc. >> Bus 005 Device 002: ID 046d:0990 Logitech, Inc. >> >> Maybe if I use additional (PCMCIA) USB card it will work, however, as I >> mentioned in Windows it is not necessary. >> >> If you have any other idea what might cause the problem I'll be obliged >> to you for any hint. >> >> Thanks, >> Vojtech >> >> _______________________________________________ >> Linux-uvc-devel mailing list >> Linux-uvc-devel@lists.berlios.de >> https://lists.berlios.de/mailman/listinfo/linux-uvc-devel >> >> > > > -- -------------------------------------------------------------- Vojtech Franc, Ph.D. Research fellow Center for Machine Perception Department of Cybernetics Faculty of Electrical Engineering Czech Technical University in Prague email: xfra...@cmp.felk.cvut.cz www: http://cmp.felk.cvut.cz/~xfrancv phone: +420 22435 7665 -------------------------------------------------------------- _______________________________________________ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
