On Thursday 20 December 2007, Thomas Netter wrote: > Hi Laurent and UVC developers, > > I'm starting to give a close look at luvcview failures when using Xacti > cameras with UVC. I'm new to UVC so any help would be greatly appreciated. > The problem was initially described by Lars Täuber with the Sanyo HD 1000: > http://lists.berlios.de/pipermail/linux-uvc-devel/2007-September/002145.htm >l To summarize: luvcview works on the first execute-quit sequence but fails > if you try to execute luvcview again. I tried plugging Lars Täuber's code > snippet into uvc_driver.c but that had no visible effect. > > I'm experiencing the same problem with a Xacti C6. I also have access to > Xacti C4, HD 1000, and HD 2 cameras to test on other models. > > Device numbers: > Xacti HD 1000: 0474:0238 > Xacti C6: 0474:0241 > > Below are logs obtained with SnoopyPro-022 while starting AMCap video > capture on Windows XP ( http://noeld.com/programs.asp?cat=video ) > These logs track the following sequence: > - Start Amcap > - Capture 2 to 3 seconds of 320x240 video > - Quit Amcap > - Wait a few seconds > - Start Amcap > - Capture 2 to 3 seconds of 320x240 video > - Quit Amcap > > Log from "video device": > Snoopy binary log: http://www.ailab.ch/~tnetter/USBLog12.usblog > Text version: http://www.ailab.ch/~tnetter/log12.txt.gz > > Simultaneous log from "composite device": > Snoopy binary log: http://www.ailab.ch/~tnetter/USBLog13.usblog > Text version: http://www.ailab.ch/~tnetter/log13.txt.gz > > Here's what happens in Ubuntu 7.10, linux 2.6.22-14-generic, > uvcvideo-r104, luvcview-20070512 (tried both from SVN and from deb > package). > > First attempt works: > sudo ./luvcview > luvcview version 0.2.1 > Video driver: x11 > A window manager is available > video /dev/video0 > Stop asked > Clean Up done Quit > > Second attempt fails: > sudo ./luvcview > luvcview version 0.2.1 > Video driver: x11 > A window manager is available > video /dev/video0 > Unable to set format: 5. > Init v4L2 failed !! exit fatal > > If I unplug and replug the camera into the USB port then luvcview > works again for one more attempt. > > Any help / hints are welcome.
Thanks a lot for the logs. Unfortunately I won't be able to look at them before January 7th as I'll be away next week. I'll try to debug the problem when I'll come back. In the meantime, could you generate a log on Linux that includes the two luvcview runs ? In a nutshell, to use usbmon: mount -t debug none /sys/kernel/debug cat /sys/kernel/debug/usbmon/<busnr>t > usbmon.dump You will need debugfs and usbmon support in your kernel. Best regards, Laurent Pinchart _______________________________________________ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
