System setup:

I currently have Windows XP on VirtualBox running on Fedora 13 ( Just to make things hard :P )

I have a Logitech C600 webcam - and with virtual box I can send the device (marked as Unknown Device 046D:0807 [0009]) to Windows.

I have tested it with the motempl.exe... The initial behavior is as expected.  A window comes up, the camera turns on, and it looks correct,  HOWEVER, when the dos terminal is closed or Ctrl-C entered to quit the program.. The next time it starts, windows ask which USB device I want to use - it has a dropdown of the camera - but when selected IT DOES NOT WORK..  

It will not work until a reboot of windows....  so, something in the releasing of resources possibly is messing things up...

Now, I will try the javacv sample MotionDetector.class

I dropped it in the myrobotlab-0003/lib directory with all the jars from javacv

cd to the directory and used the following command line

WHAT A PITA - FINALLY GOT IT TO WORK USING THE FOLLOWING EXPLICIT PATHS

 

ReBooting :P

 

Running the JavaCV sample MotionDetector in Eclipse on Fedora works fine - however there is an error being logged to the console

HIGHGUI ERROR: V4L2: getting property #0 is not supported

 

I'll look into this later... now I want to see differences between MotionDetector.java and my OpenCV.java

 

That was easy ... No OpenCVFrameGrabber in OpenCV.java

 

I have a CvCapture object...
When a camera is activated :

capture = cvCreateCameraCapture(index);

 

MotionDetector has a 
 OpenCVFrameGrabber grabber = new OpenCVFrameGrabber(0);

 

checking google....

Found this excerpt:

 

 

		Fixed in latest release:
 * New `videoInputLib` wrapper and corresponding `VideoInputFrameGrabber` to capture using DirectShow, useful under Windows 7 where OpenCV and FFmpeg can fail to capture using Video for Windows

Use VideoInputFrameGrabber instead of OpenCVFrameGrabber.