jade - rosbag play with remap

edit

I don't have a Jade setup to test with, but I was able to remap playback on Indigo.

You want to use the remap tag inside the node tag. E.g.:

<launch>
  <arg name="file"/>
  <node pkg="rosbag" type="play" name="playback" ns="myNamespace" args="—clock $(arg file)">
     <remap from="/myTopic" to="/playback/myTopic"/>
  </node>
</launch>

That should result in the recorded topic /MyTopic being published as /playback/myTopic. To be honest, I'm not certain exactly how the remap interacts with the namespace specification (my initial testing suggests that the namespace into which you put rosbag play doesn't affect the scoping of its published topics).

At the command-line, I was able to remap topics in the usual way, using the same syntax that you suggested.

If these techniques aren't working for you on Jade, then please open an issue: https://github.com/ros/ros_comm/issues .

Although it's not clear from the statement what remap the OP is asking for specically, from the given bag file that contains /ivar/testAccel, /ivar/testPoint, /ivar/testTopic, I assume that OP wants to remap multiple topics by a single remap operation.

Although I'm not entirely sure (because I have a trouble understinding the English statement and the example table in Remapping Arguments wiki page), I don't think that is possible. My understanding is that remap in launch file works for the full exact name.

Using the example OP provides (with a little modifition done by me), the following worked on my Ubuntu 14.04 - Indigo computer.

<launch>
  <arg name="file" default="$(find foobar)/myRecord.bag" />
  <node pkg="rosbag" type="play" name="playback" ns="myNamespace" args="-l --clock $(arg file)">
    <remap from="/ivar" to="/playback/ivar"/>                      <!-- This does NOT remap. -->
    <remap from="/ivar/testPoint" to="/playback/ivar/testPoint"/>  <!-- This DOES remap. -->
  </node>
</launch>