ros_camera_info service not found for usb_cam

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Hi!

I use 2 USB cameras for stereo vision with the usb_cam driver in ROS Groovy and I would like to calibrate them with the camera_calibration package. I start the cameras with the following launch file:

<launch>
  <group ns="stereo">
    <node name="left" 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="left" />
        <param name="io_method" value="mmap"/>      
    </node>

    <node name="right" 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="right" />
        <param name="io_method" value="mmap"/>      
    </node>
  </group>  
</launch>

they work nicely. Then I want to calibrate them with the following command:

 rosrun camera_calibration cameracalibrator.py --size 9x7 --square 0.0053 right:=/stereo/right/image_raw left:=/stereo/left/image_raw left_camera:=/stereo/left right_camera:=/stereo/right --approximate=0.005

and it generates the following errors:

Waiting for service /stereo/left/set_camera_info ...
Service not found
Waiting for service /stereo/right/set_camera_info ...
Service not found

Why? How can I fix it? I know I can use the the --no-service-check parameter and it works afterwards, but it won't commit then the calibration parameters to cameras. What is the proper way to do camera calibration with the usb_cam driver?

Running the calibration with the --no-service-check parameter works and results a /tmp/calibrationdata.tar.gz file which contains the ost.txt text file with the calibration parameters. But I don't know what to do with this data in order to use the stereo vision. Can anybody help me here?

Update 1:

the /stereo/left/camera_info do exists in my case and the rostopic echo /stereo/left/camera_info streams messages like this:

---
header: 
  seq: 1383
  stamp: 
    secs: 1368623369
    nsecs: 14836818
  frame_id: left
height: 480
width: 640
distortion_model: ''
D: []
K: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
R: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
P: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
binning_x: 0
binning_y: 0
roi: 
  x_offset: 0
  y_offset: 0
  height: 0
  width: 0
  do_rectify: False
---

Update 2:

the rosservice list query results the following output:

/rosout/get_loggers
/rosout/set_logger_level
/stereo/left/get_loggers
/stereo/left/image_raw/compressed/set_parameters
/stereo/left/image_raw/compressedDepth/set_parameters
/stereo/left/image_raw/theora/set_parameters
/stereo/left/set_logger_level
/stereo/right/get_loggers
/stereo/right/image_raw/compressed/set_parameters
/stereo/right/image_raw/compressedDepth/set_parameters
/stereo/right/image_raw/theora/set_parameters
/stereo/right/set_logger_level