1. Recording and playing back data

   This tutorial will teach you how to record data from a running ROS system into a .bag file, and then to play back the data to produce similar behavior in a running system

2. Reading messages from a bag file

   Learn two ways to read messages from desired topics in a bag file, including using the really handy ros_readbagfile script.

3. Producing filtered bag files

   This tutorial will cover using rosbag filter to filter bag files into new bag files using topic and data information

4. How to export image and video data from a bag file

   This tutorial explains how to export image messages from a bag file into a series of jpeg images and then goes on to show how to encode them into an OGG Theora video.

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