MATLAB: Warning: Unable to set the selected source. Perhaps the device is in use.

image processingvideo processing

Hi,
I am trying to display an image captured from my webcam. I am using matlab version 8.1.0.604 (R2013a) on Ubuntu 12.04.
Here is my very simple code:
imaqhwinfo
cam1=imaqhwinfo('linuxvideo',1);
vid1=videoinput('linuxvideo',1);
% cam1.SupportedFormats
preview(vid1);
which produces this error:
      InstalledAdaptors: {'dcam'  'gentl'  'gige'  'linuxvideo'}
          MATLABVersion: '8.1 (R2013a)'
            ToolboxName: 'Image Acquisition Toolbox'
         ToolboxVersion: '4.5 (R2013a)'
Warning: Unable to set the selected source.  Perhaps the device is
in use. 
Error using imaqdevice/preview (line 177)
Could not connect to the image acquisition device.  Device may be
in use.
Error in main (line 58)
preview(vid1);
My webcam is a Logitech C270, which works fine with other applications eg. Skype.
Any help in understanding the cause of this error would be greatly appreciated!
Thanks,
Mark

Best Answer

I'm afraid the solution was quite simple, I changed the camera to a different USB socket and I can now capture images fine. Thanks for reading and thanks Ravi for trying.
Mark
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