On Fri, 20 May 2011 10:13:23 +0200
olohmann <olohmann@offis.de> wrote:

> > > > make sure your camera is available to the system as /dev/video1
> > > > (as you specified in the launchfile).
> > >
> > > /dev/video1 is correct in the launch-file.
> > >
> > > I am trying to calibrate multiple cameras according to
> > > http://www.ros.org/wiki/camera_pose_calibration the first
> > > camera /dev/video0 is the build in webcam of the laptop
> > > and /dev/video1 is the philips webcam.
> > >
> > >
> > > > Usually, eg. if that's the only
> > > > camera you're using, this will be /dev/video0 rather (check what
> > > > ls /dev/video* returns). I guess you already tried if your
> > > > camera works with your system eg. using
> > > > guvcview -d /dev/video0 .
> > >
> > > Both cameras are working with guvcview.
> > 
> > Could you confirm that the Philips camera only supports either RAW
> > or YUV 4:2:0? The current uvc_cam-based drivers in ROS only support
> > RGB, YUYV or MJPEG (at least last time I checked). You can find a
> > comparison of the USB drivers available here:
> > http://answers.ros.org/question/57/what-driver-should-i-use-for-my-usb-camera .
> > You could give gscam or gencam_cu . There is also usb_cam, but that
> > may not support YUV 4:2:0 either.
> 
> According to the specs the data format of the Philips camera is I420,
> IYUV. So I guess, right now it is not working with this driver.
> 
> The gencam_cu driver is working but does not publish the /camera_info
> topic, which is needed to calibrate the camera. 

The gscam stack is working too and is publishing the
topic /camera_info. The camera node can be started with

roscd gscam
cd bin
export GSCAM_CONFIG="v4l2src device=/dev/video1 ! video/x-raw-yuv !
ffmpegcolorspace" 
rosrun gscam gscam

> > > > Also, always check answers.ros.org for existing answers to your
> > > > problem and post your questions there.
> > >
> > > > Regards,
> > > > Tom
> > > >
> > > > W dniu 17.05.2011 10:19, Okko Lohmann pisze:
> > > > > Hello,
> > > > >
> > > > > I am trying to get the  uvc_camera-node (ubuntu 10.10, package
> > > > > ros-diamondback-camera-umd)  to work with my "Philips SPC
> > > > > 900NC PC Camera" usb-webcam, but the node exits with the
> > > > > following error:
> > > > >
> > > > > pixfmt 0 = 'PWC2' desc = 'Raw Philips Webcam'
> > > > >    discrete: 640x480:
> > > > > pixfmt 1 = 'YU12' desc = '4:2:0, planar, Y-Cb-Cr'
> > > > >    discrete: 160x120:   1/5 1/10 1/15 1/20 1/25 1/30
> > > > >    discrete: 320x240:   1/5 1/10 1/15 1/20 1/25 1/30
> > > > >    discrete: 640x480:   1/5 1/10 1/15
> > > > > terminate called after throwing an instance of
> > > > > 'std::runtime_error' what():  couldn't set format
> > > > > [uvc_camera-1] process has died [pid 11142, exit code -6].
> > > > > log files:
> > > > > ~/log/97474b26-8052-11e0-9f91-002326f94616/uvc_camera-1*.log
> > > > > all processes on machine have died, roslaunch will exit
> > > > > shutting down processing monitor... ... shutting down
> > > > > processing monitor complete
> > > > >
> > > > > I am using the launch-file:
> > > > >
> > > > > <launch>
> > > > > <node pkg="uvc_camera" type="camera_node" name="uvc_camera"
> > > > > output="screen"> <param name="device" type="string"
> > > > > value="/dev/video1" /> <param name="width" type="int"
> > > > > value="640" /> <param name="height" type="int" value="480" />
> > > > > </node>
> > > > > </launch>
> > > > >
> > > > > the philips webcam is working with mplayer and the build in
> > > > > laptop camera is working with the uvc_camera-node.
> > > > >
> > > > > O.Lo
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> 
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