Hi Dejan, Thanks for the very prompt reply. Unfortunately it does not work. My Makefile now has the following contents: include $(shell rospack find mk)/cmake.mk -D WITH_FFMPEG=ON Is this what you meant? Thanks. -- View this message in context: http://ros-users.122217.n3.nabble.com/cvCaptureFromAVI-returns-NULL-tp1468798p1468898.html Sent from the ROS-Users mailing list archive at Nabble.com.