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Try to install some/all packages from: http://opencv.willowgarage.com/wiki/InstallGuide

"(Optional) ffmpeg, libgstreamer, libv4l, libxine, unicap, libdc1394 2.x.

You should have some/all of these packages installed (together with

associated development packages) to add video capturing, video decoding and video encoding capabilities to highgui. The output of the cmake will show you, which of the packages have been detected and will be used in highgui. (Enable full video support with FFMPEG). For example, on Ubuntu 9.10 all the necessary ffmpeg files can be installed using the following command:

     sudo apt-get install libavformat-dev libswscale-dev"

And after installing it, remember to rebuild OpenCV. I have the same problem.

Try to install some/all packages from: http://opencv.willowgarage.com/wiki/InstallGuide

"(Optional) ffmpeg, libgstreamer, libv4l, libxine, unicap, libdc1394 2.x.

 
You should have some/all of these packages installed (together with

associated development packages) to add video capturing, video decoding and video encoding capabilities to highgui. The output of the cmake will show you, which of the packages have been detected and will be used in highgui. (Enable full video support with FFMPEG). For example, on Ubuntu 9.10 all the necessary ffmpeg files can be installed using the following command:

     sudo apt-get install libavformat-dev libswscale-dev"

And after installing it, remember to rebuild OpenCV. I have the same problem.