Hello, Do you have the Quickcam Pro 9000 or the Vision Pro ? I didn't have any difficulty turning off the auto-exposure with both of them. Have you tried with normal user and root ? Anyway my problem was not so with the framerate (which may be dependant of the exposure) but on dropped frames (which has an effect on framerate)
Regards, 2009/6/25 Andrey Nechypurenko <[email protected]>: > > Hi, > >> 1) dropping by the device because the host is too slow to drain the data, -> >> use a different host to test > > I also have this camera and on my Dell Precission M6400 notebook running > latest stable Debian (lenny) luvcview shows no more then 10-12 fps so far. > I did try it only in room with "normal" light conditions and auto-exposure > turned on. I beleave auto-exposure was turned on because as I know it is the > default setting and attempt to turn it off using luvcview does not work. I am > currently on different computer and do not remember exact error message but > it was just saying that attempt to turn it off failed. > > Just want to mention it to exclude USB and host performance related issue. > > Regards, > Andrey. > > > On Wed, Jun 24, 2009 at 5:29 PM, Saint Germain <[email protected]> wrote: > > I've tried disconnecting all PCI cards except the USB controler and > using it in different slot, but same results. > I also tried booting with acpi=off but no such luck. > > I will try on another computer this week end. Really strange... I never > had any problem with this USB controler. > > I also have a Philips Toucam Pro (need pwc driver) which if connected > on the same port works correctly without a single dropped frame (but > with a poor definition, something about the previous pwcx module being > reimplemented). > > Maybe some freak combination of motherboard + USB controler + UVC > module ? > > I'll keep you updated this WE. > > Thanks for your help ! > > On Wed, 24 Jun 2009 23:46:11 +0100, Paulo Assis <[email protected]> > wrote : > > >> The YUYV fps difference to MJPG, IMHO, can only be caused by the >> frame size. MJPG is compressed so it can be some 10 times smaller >> compared to YUYV. This also indicates that CPU is not a problem since >> MJPG requires a lot more CPU (needs decompressing) >> So if memory is also not a problem, the only thing left is the USB >> connection. >> >> I'm just intrigued by the flickering, even at 20 fps video should be >> acceptable, I'm guessing the driver is dropping some data, in yuv >> case the entire frame as incomplete frames are droped by default, in >> the case of MJPG since there is no way of knowing the complete frame >> size (it varies due to the compression process), you just get part of >> the frame and that causes the ficker. >> >> In any case all seems to point to the usb connection, so I would run >> some tests on that. >> >> Best regards, >> Paulo > > _______________________________________________ > Linux-uvc-devel mailing list > [email protected] > https://lists.berlios.de/mailman/listinfo/linux-uvc-devel > > > > -- > Best Regards > Brian > > > > > _______________________________________________ > Linux-uvc-devel mailing list > [email protected] > https://lists.berlios.de/mailman/listinfo/linux-uvc-devel > _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
