ROS offline bag view with message_filter synchronizer callbacks

I have a stereo camera node that takes in images and camera infos set up with an approximate sync policy: typedef message_filters::sync_policies::ApproximateTime ApproximatePolicy; typedef message_filters::Synchronizer ApproximateSync; approximate_sync.registerCallback(boost::bind(&Node::image_callback, this, _1, _2, _3, _4)); I want to run an offline executable that will open up ros::Views on several rosbags in C++. How can I use the existing callbacks and time synchronizers by iterating through rosbag::MessageInstance? Thanks!