[ros-users] rosbag play help

Peshala Jayasekara peshala_24 at yahoo.com
Wed Oct 13 07:30:47 UTC 2010

Thanks Patrick.
It worked.

From: Patrick Mihelich <mihelich at willowgarage.com>
To: User discussions <ros-users at code.ros.org>
Sent: Wednesday, October 13, 2010 15:53:42
Subject: Re: [ros-users] rosbag play help

Instead of changing the bag file time stamps, you should use simulated time. See 

Short version:
 - Before launching any nodes, set parameter /use_sim_time to True.
 - Use the --clock option of rosbag play.

Then rosbag will publish the simulated time on the /clock topic. All nodes using 
ROS time will use the simulated time instead of wall-clock time.


On Tue, Oct 12, 2010 at 11:41 PM, Peshala Jayasekara <peshala_24 at yahoo.com> 

Hi all,
>I want to know if there is a way to change the time stamp of a bagfile when you 
>play it.
>For example, when you run robot_pose_ekf of navigation stack, it compares 
>current time with sensor time stamps and it will not update the filter for old 
>sensor data.
>Thank you in advance.
>ros-users mailing list
>ros-users at code.ros.org

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