rosbag filter 过滤topic

rosbag/Tutorials/Producing filtered bag files 

rosbag filter <your bagfile> turtlecom.bag 'topic == "/turtle1/command_velocity"'

Now run rosbag info on turtlecom.bag. You should see a single topic for command_velocity.

The python filter functionality can extend beyond separating out messages by topic name - we can also filter based on the actual data in the message. For instance, suppose that my original teleop of turtlesim produced the following behavior:

github上有个老哥用qt搞了gui

https://github.com/AtsushiSakai/rosbag_filter_gui

不用自己搞了　I think github should add a "like" button