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Try using roslaunch. E.g.

<launch>
  <node pkg="rosbag" type="rosbag" name="rosbag" args="play -2 $(find NAME_OF_PACKAGE)/subset.bag" required = "true"/>
  <node pkg="stagelistener" type="stagelistener" name="stagelistener" args="listen"/>
</launch>

Not sure why you need the stdin stuff.. but I'm sure you have a good reason.

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