i was busy trying that with the ip-cams in our lab... only worked on linux with gnomevfssrc, but i just found another promising way using rtspsrc:

http://gstreamer.org/data/doc/gstreamer/head/gst-plugins-good-plugins/html/gst-plugins-good-plugins-rtspsrc.html
http://blog.nicolargo.com/2009/04/gstreamer-aime-les-cameras-ip-axis.html

i don't understand much french, though and haven't had time to test it... please write back if you got it running

i understood that its for linux, but it shows some lines on how to use rtspsrc, which afaik is supported in the windows-binaries of gstreamer (in contrast to gnomevfssrc)

Last time i tried, i experienced the exact same problem you described... maybe we should ask the gstreamer guys?

I tried to launch the stream directly from gst-launch.exe, but if i remember correctly, it was grey there as well, so i expect the fault not to be in GSVideo...

I hope we can figure it out somehow (i don't own a ip-cam myself, so i can just test it in the lab @ university)

DESPERATE FOR ANY HELP TO MOVE THIS FORWARD AS TIME IS RUNNING OUT

import codeanticode.gsvideo.*;
import hypermedia.video.*;
GSPipeline pipe;
OpenCV opencv;
void setup() {
//  pipe = new GSPipeline(this, "gnomevfssrc location=http://192.168.1.118/axis-cgi/mjpg/video.cgi?resolution=640x480 ! jpegdec ! ffmpegcolorspace");
//  http://192.168.2.3/jpg/image.jpg
pipe = new GSPipeline(this, "gnomevfssrc location=http://192.168.2.3/mjpg/video.mjpg");
opencv = new OpenCV( this );
opencv.allocate(width,height);
}
void draw() {
if (pipe.available() == true) {
   pipe.read();
   opencv.copy(pipe, 0, 0, 640, 480, 0, 0, width, height);
   print ("   hello    ");
}
print ("   not found   ");
}