Hi,
I ran into a problem while trying to get a "Microsoft LifeCam
Studio(TM)" (045e:0772) to work with uvccapture on a Raspberry PI
running Kernel 3.6.11 under Debian Wheezy.
I started grabbing a picture with:
/usr/bin/uvccapture -x1920 -y1080 -o/media/ramdisk/webcam.jpg -q80
[1]
http://ftp.de.debian.org/debian/pool/main/u/uvccapture/uvccapture_0.5.orig.tar.gz
[2]
http://ftp.de.debian.org/debian/pool/main/u/uvccapture/uvccapture_0.5-2.debian.tar.gz
Grabbing a picture takes between 20 seconds and 1-2 minutes.
Unfortuantely the captured image is heavily distorted.
Doing a stack trace I see that it always hangs on:
ioctl(3, VIDIOC_STREAMON, 0xbe8f15e4) = 0
ioctl(3, VIDIOC_DQBUF
So I did an:
echo 0xffff > /sys/module/uvcvideo/parameters/trace
This resulted in a rather lengthy kernel log starting like this:
Apr 10 07:08:11 raspberrypi kernel: [ 5262.503209] uvcvideo:
uvc_v4l2_ioctl(VIDIOC_G_CTRL)
Apr 10 07:08:11 raspberrypi kernel: [ 5262.509395] uvcvideo:
uvc_v4l2_ioctl(VIDIOC_QUERYCTRL)
Apr 10 07:08:11 raspberrypi kernel: [ 5262.509466] uvcvideo: Control
0x00980913 not found.
Apr 10 07:08:11 raspberrypi kernel: [ 5262.519683] uvcvideo:
uvc_v4l2_ioctl(VIDIOC_STREAMON)
Apr 10 07:08:11 raspberrypi kernel: [ 5262.524446] uvcvideo: Device
requested 3072 B/frame bandwidth.
Apr 10 07:08:11 raspberrypi kernel: [ 5262.524481] uvcvideo: Selecting
alternate setting 24 (3072 B/frame bandwidth).
Apr 10 07:08:11 raspberrypi kernel: [ 5262.534925] uvcvideo: Allocated 5
URB buffers of 32x3072 bytes each.
Apr 10 07:08:11 raspberrypi kernel: [ 5262.540632] uvcvideo:
uvc_v4l2_ioctl(VIDIOC_DQBUF)
Apr 10 07:08:12 raspberrypi kernel: [ 5263.014155] uvcvideo: USB
isochronous frame lost (-63).
Apr 10 07:08:12 raspberrypi kernel: [ 5263.019468] uvcvideo: USB
isochronous frame lost (-63).
Apr 10 07:08:12 raspberrypi kernel: [ 5263.024473] uvcvideo: USB
isochronous frame lost (-63).
Apr 10 07:08:12 raspberrypi kernel: [ 5263.068612] uvcvideo: USB
isochronous frame lost (-63).
Apr 10 07:08:12 raspberrypi kernel: [ 5263.078582] uvcvideo: USB
isochronous frame lost (-63).
Apr 10 07:08:12 raspberrypi kernel: [ 5263.327576] uvcvideo: USB
isochronous frame lost (-63).
Apr 10 07:08:12 raspberrypi kernel: [ 5263.366721] uvcvideo: Frame
complete (overflow).
Apr 10 07:08:12 raspberrypi kernel: [ 5263.366759] uvcvideo: Dropping
payload (out of sync).
It continued to show over 1Mio lines in 5 minutes with:
Apr 10 07:08:12 raspberrypi kernel: [ 5263.371102] uvcvideo: Dropping
payload (out of sync).
intermitted by a few:
Apr 10 07:08:12 raspberrypi kernel: [ 5263.388864] uvcvideo: USB
isochronous frame lost (-63).
After enabling the trace uvccapture was not able to garb an image at
all. I had to kill the process.
I am at loss here... The whole setup worked flawlessly on my Laptop with
Debian Wheezy and kernel 3.2 on an Intel Chipset.
I did a few more tests lowering the capture resolution which seemed to
work a lot better. Up to 800x600 the images were captured almost
instantly, but they were still distorted. At the resolution of 640x480
the images were finally clear. But since the camera supports 1920x1080,
I would also like to be able to capture at this resolution...
Any help is greatly appreciated.
Thanks in advance.
André
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