[ros-users] Webcam (usb_cam) issues.....

[Adam Leeper]

Hi Martijn-

I can't comment on your errors with usb_cam specifically, but I have had
good success with webcams in ros (specifically logitech c905) using the
packages uvc_cam (in sail-ros-pkg) and uvc_stereo (
http://www.ros.org/wiki/uvc_stereo). Have you tried looking into these?

--Adam




Adam Leeper
Stanford University
aleeper at stanford.edu
719.358.3804


On Thu, Sep 16, 2010 at 6:06 AM, Martijn Hazenberg
<mhazenberg75 at gmail.com>wrote:

> Hi all,
>
> For our developments we would like to hook up 2 webcams to Ros and make
> them visible in our own gui.
>
> From
> http://www.iheartrobotics.com/2010/05/testing-ros-usb-camera-drivers.htmlwe learned that starting with USB_CAM package would be advised, so we did.
> We started with a clean USB_CAM package.
> When we started the package with  rosrun usb_cam usb_cam_node, we found
> that we had select timeout, everytime we started it.
> To overcome this we increased the timeout to app. 15 sec. since we read
> somewhere that the driver init process takes quite a lot of time (somehow).
> The new problem is, dat the package will fail most of time with the
> following error:
>
> :~/ros_packages/usb_cam/src/usb_cam_node$ rosrun usb_cam usb_cam_node
> usb_cam video_device set to [/dev/video0]
> usb_cam io_method set to [mmap]
> usb_cam image_width set to [640]
> usb_cam image_height set to [480]
> usb_cam pixel_format set to [yuyv]
> VIDIOC_S_FMT error 5, Input/output error
> :~/ros_packages/usb_cam/src/usb_cam_node$
>
> in dmesg the last entry then is:
>
> [  595.814126] uvcvideo: Failed to set UVC probe control : -110 (exp. 26).
>
> When i change the image size in the usb_cam_node code from 640x480 to
> 800x600 I get:
>
> :~/ros_packages/usb_cam/src/usb_cam_node$ rosrun usb_cam usb_cam_node
> usb_cam video_device set to [/dev/video0]
> usb_cam io_method set to [mmap]
> usb_cam image_width set to [800]
> usb_cam image_height set to [600]
> usb_cam pixel_format set to [yuyv]
> select timeout
> :~/ros_packages/usb_cam/src/usb_cam_node$
>
> or after another restart:
>
> :~/ros_packages/usb_cam/src/usb_cam_node$ rosrun usb_cam usb_cam_node
> usb_cam video_device set to [/dev/video0]
> usb_cam io_method set to [mmap]
> usb_cam image_width set to [800]
> usb_cam image_height set to [600]
> usb_cam pixel_format set to [yuyv]
> VIDIOC_S_FMT error 5, Input/output error
> :~/ros_packages/usb_cam/src/usb_cam_node$
>
> again, dmesg provides the same message as before.
>
> when i change the image size to 320x240 most of the times it will give me
> the same error :
>
> VIDIOC_S_FMT error 5, Input/output error
>
> but sometimes it will correctly start :
>
> :~/ros_packages/usb_cam/src/usb_cam_node$ rosrun usb_cam usb_cam_node
> usb_cam video_device set to [/dev/video0]
> usb_cam io_method set to [mmap]
> usb_cam image_width set to [320]
> usb_cam image_height set to [240]
> usb_cam pixel_format set to [yuyv]
> 1 frames/sec at 1284642005.985820517
> 1 frames/sec at 1284642006.993781394
> 1 frames/sec at 1284642008.011523040
>
> When it entually does work, we're able to see the image with rosrun
> image_view image_view
>
> rosrun image_view image_view image :=/usb_cam/image_raw
>
> Any idea on what the problem is here ?
>
> The camera is working, verified with guvcview under all different formats.
>
> Thanks
> Martijn
>
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