Hi,
My knowledge of ROS/Linux is limited, so I'm hoping someone could kindly help me.
I am using Virtual Box running Linux 14.04, and ROS Indigo.
I am trying to use a dual camera setup in order to obtain stereo vision via ROS.
The cameras are on this USB module that I can access, and when I try to open it in Windows, I see the cameras as two different devices. I can also see them as two video devices on my VM.
> ls /dev/video*> /dev/video0 /dev/video1
However, both cheese nor GTK UVC video viewer was unable to open the device.
Cheese says "There was an error playing video from the webcam" even though I can see the device being selected in its Preferences.
GTK UVC just captures blackness.
I also tried to use cv_camera but that did not give me a launch file to use.
So I tried libuvc_camera but that also didn't give me a launch file.
I basically did these and not sure how to go from there, without a launch file:
> sudo apt-get install ros-indigo-cv-camera> sudo apt-get install ros-indigo-libuvc-camera
I don't know how to get them to work. I then tried to do the same with the usb_camera package, which has a launch file:
> roslaunch usb_cam usb_cam-test.launch
But when I used the launch, I get these errors:
> setting /run_id to e42f368a-4a2b-11e6-a2c1-08002755c1aa> process[rosout-1]: started with pid [11222]> started core service [/rosout]> process[usb_cam-2]: started with pid [11236]> process[image_view-3]: started with pid [11240]> [ INFO] [1468546306.052415844]: Using transport "raw"> [ INFO] [1468546306.480381780]: using default calibration URL> [ INFO] [1468546306.480561586]: camera calibration URL: file:///home/max/.ros/camera_info/head_camera.yaml> [ INFO] [1468546306.480649985]: Unable to open camera calibration file [/home/max/.ros/camera_info/head_camera.yaml]> [ WARN] [1468546306.480709246]: Camera calibration file /home/max/.ros/camera_info/head_camera.yaml not found.> [ INFO] [1468546306.480765315]: Starting 'head_camera' (/dev/video0) at 640x480 via mmap (yuyv) at 30 FPS> [ERROR] [1468546306.742666755]: VIDIOC_STREAMON error 5, Input/output error> [usb_cam-2] process has died [pid 11236, exit code 1, cmd /opt/ros/indigo/lib/usb_cam/usb_cam_node __name:=usb_cam __log:=/home/max/.ros/log/e42f368a-4a2b-11e6-a2c1-08002755c1aa/usb_cam-2.log].
log file: /home/max/.ros/log/e42f368a-4a2b-11e6-a2c1-08002755c1aa/usb_cam-2*.log
Basically 1) I don't know if my webcam is actually connected and 2) I don't know how to use the packages that might help me extract the camera data (let alone stereo data). I know I need to do camera calibration at some point, but I thought libuvc_camera is the best option for that.
I'm very stuck, so any help is appreciated. Thank you.
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