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I believe your issue is that both cameras exist in the same namespace. This can be modified within openni.launch through the following argument:

<arg name="camera" default="camera"/>

I believe your issue is that both cameras exist in the same namespace. This can be modified within openni.launch through the following argument:

   <!-- "camera" should uniquely identify the device. All topics are pushed down
   into the "camera" namespace, and it is prepended to tf frame ids. -->
    <arg name="camera" default="camera"/>default="camera" />

I believe your issue is that both Are the two cameras exist in the same namespace. separate namespaces? This can be modified within openni.launch through the following argument:

   <!-- "camera" should uniquely identify the device. All topics are pushed down
   into the "camera" namespace, and it is prepended to tf frame ids. -->
    <arg name="camera" default="camera" />

So running roslaunch openni_launch openni.launch camera:=camera1 on the first camera, and, on the other, roslaunch openni_launch openni.launch camera:=camera2 should publish the topics under separate namespaces.