“Can I convert .bag to .mp4 in Ubuntu if I get ‘No module named roslib’ error?”

I used Intel RealSense Depth Camera D435i to record some videos, exported them as a .bag file and try to convert them into .mp4.

I just found a GitHub repo that has done a similar thing called rosbag2video.

However, when I installed the dependencies it required and run the script, I got an error ModuleNotFoundError: No module named 'roslib'

I did try to follow the blog which is Installing ROS2 on Ubuntu 22.04 with no error emerged.

When I run python rosbag2video.py location1.bag, it still contains the same problems.

My system info will be:

Distributor ID: Ubuntu

Description: Ubuntu 22.04.2 LTS

Release: 22.04

Codename: jammy

=================== Update ===================

I discover one possible reason from rospy/Troubleshooting.

This probably means that your PYTHONPATH is not configured. Please make sure that your PYTHONPATH includes $ROS_ROOT/core/roslib/src.

It should be done when i
echo "source /opt/ros/humble/setup.bash" >> ~/.bashrc and source ~/.bashrc according to the blog?

Since no error emerge when installing ROS2 according the blog above, the update section is for reference only.