## Your Environment

Thank you for taking the time to report an issue.

To more efficiently resolve this issue, we'd like to know some basic information about your system and setup.

1) Your operating system:

2) Version of python you are running (`python --version`):

3) How did you install rosbags? Did you use pip to install from PyPI or a repository checkout or something else?

4) Version of rosbags you have installed (`pip show rosbags | grep Version`):


If you're having issues with (de)serialization of custom message types please include a copy of the following:
* Message definition files (msg or idl)
* The bytes of an example message


## The Issue

Please describe the issue that you are experiencing.


## Steps to Reproduce

If the issue is predictable and consistently reproducible, please list the steps here.