title: Raspberry Pi webcam unable to open video device
body: <p>Error  " Unable to open video device " </p>
  
  <p>I am using a HP Deluxe Webcam (EW193AA) with raspberry pi</p>
  
  <p>log of lsusb</p>
  
  <pre><code>Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp.
  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.
  Bus 001 Device 006: ID 093a:2621 Pixart Imaging, Inc. PAC731x Trust Webcam
  Bus 001 Device 005: ID 413c:2107 Dell Computer Corp.
  </code></pre>
  
  <p>log of motion -n</p>
  
  <pre><code>[0] Processing thread 0 - config file /etc/motion/motion.conf
  [0] Motion 3.2.12 Started
  [0] ffmpeg LIBAVCODEC_BUILD 3482368 LIBAVFORMAT_BUILD 3478785
  [0] Thread 1 is from /etc/motion/motion.conf
  [0] httpd bind(): Address already in use
  [0] httpd thread exit
  [1] Thread 1 started
  [1] cap.driver: "gspca_pac7302"
  [1] cap.card: "USB Camera (093a:2621)"
  [1] cap.bus_info: "usb-bcm2708_usb-1.2"
  [1] cap.capabilities=0x85000001
  [1] - VIDEO_CAPTURE
  [1] - READWRITE
  [1] - STREAMING
  [1] Config palette index 8 (YU12) doesn't work.
  [1] Supported palettes:
  [1] 0: PJPG (PJPG)
  [1] Unable to find a compatible palette format.
  [1] ioctl (VIDIOCGCAP): Inappropriate ioctl for device
  [1] Could not fetch initial image from camera
  [1] Motion continues using width and height from config file(s)
  [1] Resizing pre_capture buffer to 1 items
  [1] bind(): Address already in use
  [1] Problem enabling stream server in port 8081: Address already in use
  [1] Thread exiting
  [0] Motion thread 1 restart
  </code></pre>
  
  <p>I have tried changing width and height to 160*140, 320*240,640*480 but resulted in same error.... but cannot find a solution...</p>