some dartclients fail with the message
/.../MITK-MBI-Superbuild-Debug-nightly/MITK-superbuild/CMakeExternals/Source/OpenCV/modules/highgui/src/cap_ffmpeg.cpp:469: error: 'CODEC_TYPE_VIDEO' was not declared in this scope
this is due to the incompatibility of OpenCV 2.2 with the newest ffmpeg versions bundled with newer ubuntu distributions as described on the OpenCV bugtracker: https://code.ros.org/trac/opencv/ticket/1020
we should update the superbuild to use OpenCV 2.3 in the next bugsquashing session