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why the time stamp of the message is later than the rosbag time?

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I'm debugging my code with rosbag replay. In my code, I did tf transform like this: tf.transformPose(target_frame, input_pose, output_pose); Sometimes, there's an exception thrown, which read: "Lookup would require extrapolation into the future. Requested time 1484037737.206813097 but the latest data is at time 1484037724.492085834, when looking up transform from frame [odom] to frame [map]" I checked in the debugger, and found the time stamp of the message input_pose is later than the rosbag time: p input_pose.stamp_ $1 sec = 1484037737, nsec = 206813097 p ros::Time::now() $2 sec = 1484037724, nsec = 918256570 Also, the rosbag play console shows: [PAUSED] Bag Time: 1484037724.967132 The commands I used to run the rosbag is rosbag play --clock --pause bagfile.bag And the param use_sim_time is already set to true: $rosparam get use_sim_time true Could anyone please help with this problem? Thanks!

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