Usb_cam ignoring camera_frame_id

I have a launch file for starting a stereo USB camera: However, when I run this, I get the warnings: [ WARN] [1431313131.230893149]: [head_camera] does not match name left_camera in file ~/git/stereo_slam_test/src/stereo_slam_test/config/usb1-config-left.yml [ INFO] [1431313131.230983626]: Starting 'head_camera' (/dev/video1) at 320x240 via mmap (yuyv) at 30 FPS [ INFO] [1431313131.273715224]: camera calibration URL: ~/git/stereo_slam_test/src/stereo_slam_test/config/usb1-config-right.yml [ WARN] [1431313131.275529366]: [head_camera] does not match name right_camera in file ~/git/stereo_slam_test/src/stereo_slam_test/config/usb1-config-right.yml Why is it using the "head_camera" frame id for both cameras when I explicitly set it to "left_camera" and "right_camera" in my launch file? Edit: The output of `rosparam get /raw_stereo`: left: camera_frame_id: left_camera camera_info_url: file:///home/chris/git/stereo_slam_test/src/stereo_slam_test/config/usb1-config-left.yml image_height: 240 image_raw: compressed: {format: jpeg, jpeg_quality: 80, png_level: 9} compressedDepth: {depth_max: 10.0, depth_quantization: 100.0, png_level: 9} theora: {keyframe_frequency: 64, optimize_for: 1, quality: 31, target_bitrate: 800000} image_width: 320 io_method: mmap pixel_format: yuyv video_device: /dev/video1 right: camera_frame_id: right_camera camera_info_url: file:///home/chris/git/stereo_slam_test/src/stereo_slam_test/config/usb1-config-right.yml image_height: 240 image_raw: compressed: {format: jpeg, jpeg_quality: 80, png_level: 9} compressedDepth: {depth_max: 10.0, depth_quantization: 100.0, png_level: 9} theora: {keyframe_frequency: 64, optimize_for: 1, quality: 31, target_bitrate: 800000} image_width: 320 io_method: mmap pixel_format: yuyv video_device: /dev/video2