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Maybe you can try another pixel format, my launch file for my usb webcam looks like this:

<launch>
  <node name="usb_cam" pkg="usb_cam" type="usb_cam_node">
    <param name="video_device" value="/dev/video0" />
    <param name="image_width" value="640" />
    <param name="image_height" value="480" />
    <param name="pixel_format" value="yuyv" />
    <param name="camera_frame_id" value="usb_cam" />
    <param name="io_method" value="mmap" />
  </node>

</launch>