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Hello,
First you need to change from
<param name="pixel_format" value="mjpeg" />
to
<param name="pixel_format" value="yuyv" />
Then you need to remap topic name from
<remap from="image" to="/usb_cam/image_raw"/>
to
ex: <remap from="image" to="/group_name/node_name/image_raw"/>
<remap from="image" to="/camera1/usb_cam1/image_raw"/>
Your code should be like:
<launch>
<group ns="camera1">
<node name="usb_cam1" pkg="usb_cam" type="usb_cam_node" output="screen" >
<param name="video_device" value="/dev/video1" />
<param name="image_width" value="640" />
<param name="image_height" value="480" />
<param name="pixel_format" value="mjpeg" />
<param name="camera_frame_id" value="yuyv" />
<param name="io_method" value="mmap"/>
</node>
<node name="image_view" pkg="image_view" type="image_view" respawn="false" output="screen">
<remap from="image" to="/camera1/usb_cam1/image_raw"/>
<param name="autosize" value="true" />
</node>
</group>
<group ns="camera2">
<node name="usb_cam2" pkg="usb_cam" type="usb_cam_node" output="screen" >
<param name="video_device" value="/dev/video2" />
<param name="image_width" value="640" />
<param name="image_height" value="480" />
<param name="pixel_format" value="mjpeg" />
<param name="camera_frame_id" value="yuyv" />
<param name="io_method" value="mmap"/>
</node>
<node name="image_view" pkg="image_view" type="image_view" respawn="false" output="screen">
<remap from="image" to="/camera2/usb_cam2/image_raw"/>
<param name="autosize" value="true" />
</node>
</group>
</launch>