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I fixed it! Use the patch described at :

http://toychest.in.tum.de/wiki/_media/fastdev:gscam.patch

in particularly, add the following instructions in src/gscam.cpp:

ros::Time now = ros::Time::now();
msg.header.stamp.sec = now.sec; 
msg.header.stamp.nsec = now.nsec;
camera_info.header.frame_id = frame_id;
camera_info.header.stamp.sec = now.sec; 
camera_info.header.stamp.nsec = now.nsec;

Bye

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