Read messages on certain topics from within a ROS bag file

Installation

First, see the Installation Instructions at the top of the file: ros_readbagfile.py.

See help menu:

ros_readbagfile -h

Basic usage:

ros_readbagfile <mybagfile.bag> [topic1] [topic2] [topic3] [...topicN]

For a tutorial demonstration, see my ROS tutorial I wrote here: Reading messages from a bag file.

In short:

Download a 730 MB demo.bag file:

 wget https://open-source-webviz-ui.s3.amazonaws.com/demo.bag

Now, read a couple topics from this file and store them into a topics.yaml file:

time ros_readbagfile demo.bag /obs1/gps/fix /diagnostics_agg | tee topics.yaml

Done! Here is a sample topics.yaml output file obtained by running the commands above: ros_readbagfile_sample_output/topics.yaml.