Problem with 2 webcams and stereo node: only 640x480? [closed]

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Hi all, I'm trying to use 2 Logitech C270 HD webcams with the uvc_camera package and the stereo_node. The problem is that I can't get frames at a resolution higher than 640x480, even setting the frame rate to 1 fps.

Using only 1 webcam, I can grab video at 1280x720@10fps correctely.

This is my launch file with resolution set to 800x600:

<launch>
  <node name="uvc_camera" pkg="uvc_camera" type="stereo_node">
    <param name="left/device" value="/dev/video2" />
    <param name="right/device" value="/dev/video1" />
    <param name="fps" value="5" />
    <param name="width" value="800" />
    <param name="height" value="600" />
    <param name="frame_id" value="central" />
  </node>
  <node name="image_view_left" pkg="image_view" type="image_view" respawn="false" output="screen">
    <remap from="image" to="/left/image_raw"/>
    <param name="autosize" value="true"/>
  </node>
  <node name="image_view_right" pkg="image_view" type="image_view" respawn="false" output="screen">
    <remap from="image" to="/right/image_raw"/>
    <param name="autosize" value="true"/>
  </node>
</launch>

This is the error log:

[ INFO] [1334572095.032073676]: using default calibration URL
[ INFO] [1334572095.032166320]: camera calibration URL: file:///home/fabio/.ros/camera_info/camera.yaml
[ WARN] [1334572095.032275757]: Camera calibration file /home/fabio/.ros/camera_info/camera.yaml not found.
[ INFO] [1334572095.036218799]: using default calibration URL
[ INFO] [1334572095.036249086]: camera calibration URL: file:///home/fabio/.ros/camera_info/camera.yaml
[ WARN] [1334572095.036323367]: Camera calibration file /home/fabio/.ros/camera_info/camera.yaml not found.
opening /dev/video2
pixfmt 0 = 'YUYV' desc = 'YUV 4:2:2 (YUYV)'
  discrete: 640x480:   1/30 1/25 1/20 1/15 1/10 1/5 
  discrete: 160x120:   1/30 1/25 1/20 1/15 1/10 1/5 
  discrete: 176x144:   1/30 1/25 1/20 1/15 1/10 1/5 
  discrete: 320x176:   1/30 1/25 1/20 1/15 1/10 1/5 
  discrete: 320x240:   1/30 1/25 1/20 1/15 1/10 1/5 
  discrete: 352x288:   1/30 1/25 1/20 1/15 1/10 1/5 
  discrete: 432x240:   1/30 1/25 1/20 1/15 1/10 1/5 
  discrete: 544x288:   1/30 1/25 1/20 1/15 1/10 1/5 
  discrete: 640x360:   1/30 1/25 1/20 1/15 1/10 1/5 
  discrete: 752x416:   1/25 1/20 1/15 1/10 1/5 
  discrete: 800x448:   1/25 1/20 1/15 1/10 1/5 
  discrete: 800x600:   1/20 1/15 1/10 1/5 
  discrete: 864x480:   1/20 1/15 1/10 1/5 
  discrete: 960x544:   1/15 1/10 1/5 
  discrete: 960x720:   1/10 1/5 
  discrete: 1024x576:   1/10 1/5 
  discrete: 1184x656:   1/10 1/5 
  discrete: 1280x720:   1/10 1/5 
  discrete: 1280x960:   2/15 1/5 
pixfmt 1 = 'MJPG' desc = 'MJPEG'
  discrete: 640x480:   1/30 1/25 1/20 1/15 1/10 1/5 
  discrete: 160x120:   1/30 1/25 1/20 1/15 1/10 1/5 
  discrete: 176x144:   1/30 1/25 1/20 1/15 1/10 1/5 
  discrete: 320x176:   1/30 1/25 ...