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VIDIOC_S_EXT_CTRLS

Tue, 09 Mar 2010 12:16:44 -0800

hello, i am working with the v4l2 api and am trying to get the pan/tilt working on my logitech orbit af. there seems to be something the matter with passing small values to the pan/tilt ioctl... check out this code-

Code:
void
pantilt (int fd, int pan, int tilt, int reset) {

    struct v4l2_ext_control xctrls[2];
    struct v4l2_ext_controls ctrls;

    ctrls.ctrl_class = V4L2_CTRL_CLASS_USER;

    if (reset) {
        switch (reset) {
            case 0:
                break;
            case 1:
                xctrls[0].id = V4L2_CID_PAN_RESET_NEW;
                xctrls[0].value = 1;
                break;
            case 2:
                xctrls[0].id = V4L2_CID_TILT_RESET_NEW;
                xctrls[0].value = 1;
                break;
            case 3:
                xctrls[0].id = V4L2_CID_PANTILT_RESET_LOGITECH;
                xctrls[0].value = 3;
                break;
        }
        ctrls.count = 1;
        ctrls.controls = xctrls;
    }
    else {
        xctrls[0].id = V4L2_CID_PAN_RELATIVE_NEW;
        xctrls[0].value = pan;

        xctrls[1].id = V4L2_CID_TILT_RELATIVE_NEW;
        xctrls[1].value = tilt;

        ctrls.count = 2;
        ctrls.controls = xctrls;
    }

    if (ioctl(fd, VIDIOC_S_EXT_CTRLS, &ctrls) == -1) {
        perror("VIDIOC_S_EXT_CTRLS");
        exit(EXIT_FAILURE);
    }
}

now, when i call the function

pantilt(fd, 1000, 0, 0);

the camera moves, as expected. however, when i execute this segment of code:

for (i=0;i

motion detection

Tue, 09 Mar 2010 06:14:12 -0800

Just bought a webcam pro 9000. Unfortunately I did not read the specification before my purchase and have since established from logitech that this webcam is not designed for automatic motion detection (surveillance etc) my primary reason for purchase. My previous logitech PRO 3000 was (which lasted 8 years before giving up). Anybody know if there is a way around this problem (third party software for example) without me buying yet another webcam??

capture of a video display flow

Tue, 09 Mar 2010 04:42:57 -0800

Hello !
Pbm: I have a device that shows a microscope capture through usb port device interface. I would like to capture the video flow to process the images for research purposes.

I've tried several available codes with directshow that works for webcams and similar devices but they don't work because the interface device is not known.

Is there a way to capture the the video flow at a certain point of the system?
Any helpful suggestion is welcome
Thx :)

B500 Webcam on Ubuntu 9.10

Mon, 08 Mar 2010 20:19:48 -0800

My webcam (PN 960-000559) fails to initialize on my ubuntu 9.10 OS. It works perfectly on my other computer, which uses windows 7. I attached the lsusb and dmesg. Help, please.

How i can capture high quality image?

Mon, 08 Mar 2010 06:55:14 -0800

Hello.
I use a Orbit AF Camera and i need to capure photos in high quality. I use the SampleGrabber to obtain it.
Actually, i capture in 1600*1200 with 96 ppp. The resolution it's ok, but, i need more quality in image.
Can anybody help me?
Thanks.

Webcam C500: UVC module fails to initialize webcam randomly in Ubuntu 9.10

Sun, 07 Mar 2010 23:48:58 -0800

Hello,

I recently purchased a C500 Webcam which is UVC-compliant
and after installing it in a clean installation of Ubuntu 9.10
it either worked or not worked after each restart
(not working more often than working).
Yesterday I updated to kernel 2.6.31-20 and it hasn't worked since.
The webcam is always plugged into the PC.
When it's not working there is no /dev/video device present in the system.

lsusb result:

Code:
Bus 001 Device 004: ID 046d:0807 Logitech, Inc.

dmesg regarding UVC:

Code:
[   13.921993] uvcvideo: Found UVC 1.00 device (046d:0807)
[   13.960944] uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported. Enabling workaround.
[   13.961435] uvcvideo: Failed to query (129) UVC probe control : -32 (exp. 26).
[   13.961443] uvcvideo: Failed to initialize the device (-5).
[   13.961531] usbcore: registered new interface driver uvcvideo
[   13.961540] USB Video Class driver (v0.1.0)

messages.log when working:

Code:
Mar  4 09:50:34 efrathome kernel: [   19.874694] uvcvideo: Found UVC 1.00 device (046d:0807)
Mar  4 09:50:34 efrathome kernel: [   19.889117] input: UVC Camera (046d:0807) as /devices/pci0000:00/0000:00:1d.7/usb1/1-4/1-4:1.0/input/input5
Mar  4 09:50:34 efrathome kernel: [   19.889196] usbcore: registered new interface driver uvcvideo
Mar  4 09:50:34 efrathome kernel: [   19.889202] USB Video Class driver (v0.1.0)

messages.log when not working:

Code:
Mar  5 20:06:23 efrathome kernel: [   20.061012] uvcvideo: Found UVC 1.00 device (046d:0807)
Mar  5 20:06:23 efrathome kernel: [   20.118623] uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported. Enabling workaround.
Mar  5 20:06:23 efrathome kernel: [   20.120534] usbcore: registered new interface driver uvcvideo
Mar  5 20:06:23 efrathome kernel: [   20.120540] USB Video Class driver (v0.1.0)

What should I do to make the UVC module recognize the webcam?
I found a somewhat similar thread regarding a different webcam of a different maker here.
However, I'd like to find a solution which doesn't require
compiling the UVC module for every new kernel update.
and of course I'm not sure if the trunk version will solve this problem.

Thank you,
-Nadav

Opening Logitech Orbit from two applications

Sun, 07 Mar 2010 23:09:14 -0800

Hello,

Does anybody know is it possible to open and use Logitech Orbit AF from two applications at the same time?. For instance open it from my DirectShow application, and open it from Logitech software (or skype) and record video and audio.

Regards
Dusan

Web cam for survilliance by using java middleware

Thu, 04 Mar 2010 21:52:29 -0800

Hi,

I am in initial development of R&D Project for video Security Survillance project.

I have written a middle ware in Java for two Single Board computers (SBC).

I want to connect webcam for boards.

I will be sending commands from my middleware to invoke the functions of camera ( like, On, OFF, Zoom, Pan, Tilt etc.,)

Tells me good camera in which the firmware can be used by our middleware.

Thanks

M. Prev Ravanth

Photo Capture from Webcam

Thu, 04 Mar 2010 09:55:59 -0800

Hello.
I need to capture a photo from Orbit AF Webcam.
Anybody have a c# demo to do this?.
Thanks a lot.

Registry setting to detect if camera is plugged/unplugged

Thu, 04 Mar 2010 08:47:49 -0800

I am writing an application which needs to detect whether the camera plugged in or unplugged - this is different from it being installed, as once the software is installed and it is plugged in once, the registry keeps these settings.

I am looking to find the registry location which indicates whether the camera is plugged in the USB slot or not, DYNAMICALLY.

Any help would be greatly appreciated for this time-critical apllication.

Thank you.

feature comparison WebCam PRO 9000

Thu, 04 Mar 2010 04:20:11 -0800

What is the difference between "WebCam Pro 9000" and "WebCam Pro 9000 for Business"?

It is prized identically on the official Logitech Website (U.S.) but the specifications available online are slightly different. I'm especially interested in UVC compatibility and driver-less deployment (for Windows systems).

http://www.logitech.com/index.cfm/webcam...3&cl=us,en

http://www.logitech.com/index.cfm/for_bu...9&cl=us,en

Thanks a lot for clarification,
Christian.

VMSystem.dll Crashed when using QuickCam Pro For Notebooks

Tue, 02 Mar 2010 02:45:33 -0800

Hi,

I am using direct show based application to access the camera. My application will be using direct show based camera capture filter to process the video captured from the camera.

When a logitech camera is in use by my application the thread from VMSystem.dll gets attached to my process and it seems to have crashed right after the graph was started. This happens only some times, because of which my application appears to have crashed to the user.

This crash has happened when using QuickCam Pro For Notebooks, on a XP PC.

Here is the extract of the crash location where the crash has been reported:

EXCEPTION_ACCESS_VIOLATION in module VMSystem.dll at 001B:0740E4C7, exception offset 0000E4C7

OS: Microsoft® Windows XP Professional Edition™ 5.1 Service Pack 3 Build 2600

EAX=0740E4B0 EBX=00001190 ECX=00000000 EDX=00000008 ESI=001AB854
EDI=0745CD20 EBP=0765FA88 ESP=0765F1FC EIP=0740E4C7 FLG=00010202
CS=001B DS=0023 SS=0023 ES=0023 FS=003B GS=0000

Call stack:
0765F1FC: 0765FAB0 0745CD20 0740BF58 0000046D 00000991 00000008
0765FA90: 9687FAF6 42B68BE7 5E0D17A8 73B5B39B 00000002 00000001 - 0001:0000D4C7 VMSystem.dll
00000008: -------- -------- -------- -------- -------- -------- -

Let me know if more details are required.

DirectShow and noise

Mon, 01 Mar 2010 00:00:04 -0800

Hi,

I use DirectShow with a Quickcam Pro 9000. When i get the frame (ISampleGrabberCB.BufferCB), the frame has some noise. If there is contrast in the scene, the frame has more noise (for example a red pen and bleu Handkerchief).

I try with a Logitech C905 too. I have the same problem.

Thanks

control logitech ptz camera pan/tilt using c or c++ o

Thu, 25 Feb 2010 23:08:59 -0800

hi, i am doing a project and is sidering to use a logitech ptz camera.
is there anyone who knows how can i control the built-in servo motor using c or c++. i already finished the code for face recognition, the camera can recognize human face and put a rectangle on the face.
the problem is can i control the built-in servo motor of the camera so that it will automatically pan/tilt when the face is moving.

thank you in advance!!

Video capture from three Webcams simultaneously

Thu, 25 Feb 2010 21:05:03 -0800

Dear webcam experts-
I am trying to use three Logitech Quickcam Deluxe for Notebooks in a custom rig to capture and record to hard drive, the video @ VGA resolution simultaneously. I used a third party software which allows video capture from any number of cameras. My problem is that I was only able to capture and record from all three cameras only when I set resolution at 320x240 for all three cameras. The third party software uses Directshow and not Video for windows. Is there any limitation in windows/Logitech drivers which wouldn't allow video capture simultaneously from the three cameras?

Any information in this regards would be appreciated.

Thanks in advance.

-Kamesh

How to ask Logitech Sphere if it is still moving?

Thu, 25 Feb 2010 09:11:56 -0800

hello,

Is it posible to ask Logitech Sphere (046d:0994) if it is still moving, via libwebcam or any other linux tool?

thanks
S.

uvcdynctrl, error 17: File exists

Thu, 25 Feb 2010 09:09:36 -0800

hello,

I have following problem with uvcdynctrl.
Installed from *.deb packages.

$ sudo uvcdynctrl-0.2.0 -d /dev/video1 -i logitech.xml
[libwebcam] Unknown V4L2 private control ID encountered: 0x0A046D03 (V4L2_CID_PRIVATE_BASE + 33844483)
[libwebcam] Unknown V4L2 private control ID encountered: 0x0A046D04 (V4L2_CID_PRIVATE_BASE + 33844484)
Importing dynamic controls from file logitech.xml.
logitech.xml: error: video1: unable to add control with GUID {63610682-5070-49ab-b8cc-b3855e8d2250} and selector 5. ioctl(UVCIOC_CTRL_ADD) failed with return value -1 (error 17: File exists)
logitech.xml: error: video1: unable to add control with GUID {63610682-5070-49ab-b8cc-b3855e8d2250} and selector 8. ioctl(UVCIOC_CTRL_ADD) failed with return value -1 (error 17: File exists)
logitech.xml: error: video1: unable to add control with GUID {63610682-5070-49ab-b8cc-b3855e8d221f} and selector 1. ioctl(UVCIOC_CTRL_ADD) failed with return value -1 (error 17: File exists)
logitech.xml: error: video1: unable to add control with GUID {63610682-5070-49ab-b8cc-b3855e8d2256} and selector 3. ioctl(UVCIOC_CTRL_ADD) failed with return value -1 (error 17: File exists)
logitech.xml: error: video1: unable to add control with GUID {63610682-5070-49ab-b8cc-b3855e8d2256} and selector 1. ioctl(UVCIOC_CTRL_ADD) failed with return value -1 (error 17: File exists)
logitech.xml: error: video1: unable to add control with GUID {63610682-5070-49ab-b8cc-b3855e8d2256} and selector 2. ioctl(UVCIOC_CTRL_ADD) failed with return value -1 (error 17: File exists)
logitech.xml: error: video1: unable to map 'Pan (relative)' control. ioctl(UVCIOC_CTRL_MAP) failed with return value -1 (error 17: File exists)
logitech.xml: error: video1: unable to map 'Tilt (relative)' control. ioctl(UVCIOC_CTRL_MAP) failed with return value -1 (error 17: File exists)
logitech.xml: error: video1: unable to map 'Pan Reset' control. ioctl(UVCIOC_CTRL_MAP) failed with return value -1 (error 17: File exists)
logitech.xml: error: video1: unable to map 'Tilt Reset' control. ioctl(UVCIOC_CTRL_MAP) failed with return value -1 (error 17: File exists)
logitech.xml: error: video1: unable to map 'Pan/tilt Reset' control. ioctl(UVCIOC_CTRL_MAP) failed with return value -1 (error 17: File exists)
logitech.xml: error: video1: unable to map 'Focus' control. ioctl(UVCIOC_CTRL_MAP) failed with return value -1 (error 17: File exists)
logitech.xml: error: video1: unable to map 'LED1 Mode' control. ioctl(UVCIOC_CTRL_MAP) failed with return value -1 (error 17: File exists)
logitech.xml: error: video1: unable to map 'LED1 Frequency' control. ioctl(UVCIOC_CTRL_MAP) failed with return value -1 (error 17: File exists)
logitech.xml: error: video1: unable to map 'Disable video processing' control. ioctl(UVCIOC_CTRL_MAP) failed with return value -1 (error 17: File exists)
logitech.xml: error: video1: unable to map 'Raw bits per pixel' control. ioctl(UVCIOC_CTRL_MAP) failed with return value -1 (error 17: File exists)

I'm using Ubuntu 9.10.

S.

Quickcam Sphere z axis control

Thu, 25 Feb 2010 07:46:00 -0800

Dear all,

I am planning to use a Logitech Quickcam Sphere MP on an ARM
embedded platform. I would like to control the movement along the
z axis. I took a look on the sorce code of v4l2_uvc.c (uvccapture
0.5 package) and I found that only pan or tilt are control are available.

Is there any way to control the movement along the z axis?

Thank you,
Attilio

webcam recognized, no /dev/video0

Thu, 25 Feb 2010 05:46:31 -0800

Please help (if you can...)

I've been looking around different forums, googling, and I cannot figure this out. I am using Logitech QuickCam and it is being recognized in Ubuntu 9.10. However, I keep getting an error that /dev/video0 is not found! How do I get it back? It worked fine just a week ago and I could see the webcam picture in Skype. I have no idea why all of a sudden it stopped working. It works under Windows XP.

Here are the details:

Code:
:~$ lsusb
Bus 005 Device 001: ID 0000:0000
Bus 004 Device 003: ID 046d:0870 Logitech, Inc. QuickCam Express
Bus 004 Device 001: ID 0000:0000
Bus 003 Device 002: ID 046d:c018 Logitech, Inc.
Bus 003 Device 001: ID 0000:0000
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 001: ID 0000:0000

Code:
~$ ls -al /dev/video0
ls: cannot access /dev/video0: No such file or directory

Code:
$ dmesg | tail -n 20
[  130.759674] NET: Registered protocol family 31
[  130.759676] Bluetooth: HCI device and connection manager initialized
[  130.759679] Bluetooth: HCI socket layer initialized
[  130.945419] Bluetooth: L2CAP ver 2.9
[  130.945423] Bluetooth: L2CAP socket layer initialized
[  130.949198] Bluetooth: RFCOMM socket layer initialized
[  130.949208] Bluetooth: RFCOMM TTY layer initialized
[  130.949209] Bluetooth: RFCOMM ver 1.8
[  132.144115] tg3: eth0: Link is up at 100 Mbps, full duplex.
[  132.144119] tg3: eth0: Flow control is on for TX and on for RX.
[  136.683159] NET: Registered protocol family 17
[  141.651726] NET: Registered protocol family 10
[  141.651924] lo: Disabled Privacy Extensions
[  152.022451] eth0: no IPv6 routers present
[  920.853238] usb 4-1: USB disconnect, address 2
[  926.294030] usb 4-1: new full speed USB device using uhci_hcd and address 3
[  926.513023] usb 4-1: configuration #1 chosen from 1 choice
[  926.515956] quickcam: QuickCam USB camera found (driver version QuickCam USB 0.6.6 $Date: 2006/11/04 08:38:14 $)
[  926.515960] quickcam: Kernel:2.6.24-16-generic bus:4 class:FF subclass:FF vendor:046D product:0870
[  926.530920] quickcam: unsupported sensor

and last but not least:

Code:
$ gstreamer-properties
gstreamer-properties-Message: Skipping unavailable plugin 'artsdsink'
gstreamer-properties-Message: Skipping unavailable plugin 'esdsink'
gstreamer-properties-Message: Skipping unavailable plugin 'sdlvideosink'
gstreamer-properties-Message: Skipping unavailable plugin 'v4lmjpegsrc'
gstreamer-properties-Message: Skipping unavailable plugin 'qcamsrc'
gstreamer-properties-Message: Skipping unavailable plugin 'esdmon'
gstreamer-properties-Message: Error running pipeline 'Video for Linux (v4l)': Device "/dev/video0" does not exist. [v4l_calls.c(168): gst_v4l_open (): /pipeline1/v4lsrc3]
gstreamer-properties-Message: Error running pipeline 'Video for Linux 2 (v4l2)': Cannot identify device '/dev/video0'. [v4l2_calls.c(429): gst_v4l2_open (): /pipeline2/v4l2src4:
system error: No such file or directory]
gstreamer-properties-Message: Error running pipeline 'Custom': Cannot identify device '/dev/video0'. [v4l2_calls.c(429): gst_v4l2_open (): /pipeline3/v4l2src5:
system error: No such file or directory]

I would appreciate any kind of advice, as I am clueless as to how I lost /dev/video0.... Thank you in advance.

How can I write program on C for display Webcam

Tue, 23 Feb 2010 11:30:13 -0800

Now, I have a project to use webcam for tracking thrown ball.
(I use Logitech Quickcam Pro 9000)

Firstly, I used C++ Language and OpenCV library to grab a frame. It is very easy. But I have a problem that is OpenCV cannot grab a frame by 30 fps. Because I have to track thrown ball then I have to use 30 fps for capturing.But OpenCV is limited at 15 fps. I cannot to find something to solve this problem.

So, I think I have to grab a frame from the webcam without using OpenCV. But I don't know how to use Windows API or any library.

So, I would like to ask anybody. Would anyone can give some example of code for grab a frame and display it for me?. Please help me! I cannot find the way how to fix this problem.

Thank you for your advance..