title: ERROR opening V4L interface: Operation not permitted
body: <p>I compiled mjpg-streamer in my raspberry pi, but when I run the below command, it occured an eeror shown in the title. Details are below:</p>
  
  <pre><code>root@raspberrypi:/home/pi/mjpg-streamer-code-182/mjpg-streamer# /usr/local/bin/mjpg_streamer -i "/usr/local/lib/input_uvc.so" -o "/usr/local/lib/output_http.so -w /usr/local/www"
  </code></pre>
  
  <p>Results:</p>
  
  <pre><code>MJPG Streamer Version: svn rev: 
  i: Using V4L2 device.: /dev/video0
  i: Desired Resolution: 640 x 480
  i: Frames Per Second.: 5
  i: Format............: MJPEG
  ERROR opening V4L interface: Operation not permitted
  Init v4L2 failed !! exit fatal 
  i: init_VideoIn failed
  </code></pre>
  
  <p>How can I get permitted to operate my v4l2?</p>