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Tf_echo missing timestamp

Hi,

I start to play my rosbag and then I start tf_echo : rosrun tf tf_echo odom map This is the output :

At time 1559381315.708

  • Translation: [0.000, 0.000, 0.000]
  • Rotation: in Quaternion [0.000, 0.000, 0.000, 1.000] in RPY (radian) [0.000, -0.000, 0.000] in RPY (degree) [0.000, -0.000, 0.000]

I am happy with this result. But now if I start tf_echo first and then I start to play the rosbag :

At time 0.000

  • Translation: [0.000, 0.000, 0.000]
  • Rotation: in Quaternion [0.000, 0.000, 0.000, 1.000] in RPY (radian) [0.000, -0.000, 0.000] in RPY (degree) [0.000, -0.000, 0.000]

You see, it doesn't display the timestamp of the rosbag but "0.000" instead. Do you have any explanation ?

Thank you