[ros-users] uvc_camera node not working with philips webcam 900nc

[Eric Perko]

On Thu, May 19, 2011 at 10:28 AM, olohmann <olohmann at offis.de> wrote:

> Sorry for the late response,
>
> > 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.
>

Okko,

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.

- Eric


>
> > 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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