$summary I think that the problem is with +debug
Created attachment 263331 [details] Build log
The error: /tmp/portage/media-libs/opencv-2.0.0/work/OpenCV-2.0.0/src/highgui/cvcap_ffmpeg.cpp: In member function ‘virtual bool CvVideoWriter_FFMPEG::writeFrame(const IplImage*)’: /tmp/portage/media-libs/opencv-2.0.0/work/OpenCV-2.0.0/src/highgui/cvcap_ffmpeg.cpp:1065: error: invalid conversion from ‘int’ to ‘PixelFormat’ /tmp/portage/media-libs/opencv-2.0.0/work/OpenCV-2.0.0/src/highgui/cvcap_ffmpeg.cpp:1065: error: initializing argument 1 of ‘int avpicture_get_size(PixelFormat, int, int)’
does not work only with +debug
Fixed by 2.2.0 in kde overlay. Will be moved to main tree soon.