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Steven P. Goldsmith edited this page Jun 1, 2013 · 36 revisions

Installation

You assume all the risks that come with flashing an Android device. It's very painless and hard to screw up, but if you do brick your Mini PC you are on your own!

I had problems using mjpg-streamer, uvccapture, fswebcam which return VIDIOC_DQBUF: Invalid argument or something similar. Cheese, gstreamer and vlc player (cvlc) worked. gstreamer worked the best, so that's what we are going to use here.

  1. Test USB camera under the original ROM
    • Boot up Mini PC with original ROM and configure your Google account
    • Download camera app if your ROM doesn't have one
    • Plug in your camera and take a picture
    • If that worked then there's a good chance it will work under PicUntu!
  2. Install Finless 1.7 ROM on MK808. If you have another Mini PC model check for Finless on that model (you can skip to step 3, but Finless makes the reboot process easier)
  3. Install PicUntu 0.9 RC3
    • Follow Install directions
    • When complete reboot into PicUntu using terminal with original ROM or Reboot app in Finless Rom (use bootloader option)
    • Make sure networking is working (ping gateway, etc.)
  4. Test camera under PicUntu
    • SSH into Mini PC as root/12qwaszx
    • lsusb
      • You should see something like:
      Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 002 Device 002: ID 03f0:a707 Hewlett-Packard
      • Note "Hewlett-Packard" is my camera
    • Add non-privileged user
      • adduser <username>
      • adduser <username> sudo
      • usermod -a -G video <username>
    • Install gstreamer
    apt-get install python-gi python3-gi \
     gstreamer1.0-tools \
     gir1.2-gstreamer-1.0 \
     gir1.2-gst-plugins-base-1.0 \
     gstreamer1.0-plugins-good \
     gstreamer1.0-plugins-ugly \
     gstreamer1.0-plugins-bad \
     gstreamer1.0-libav
    • Install uvcdynctrl
    apt-get install uvcdynctrl
    • reboot
    • SSH in as user you just created
    • Get camera information
      • export GST_DEBUG="*v4l2*:5"
      • gst-launch-1.0 -v v4l2src num-buffers=1 ! fakesink&>debug.txt
      • nano debug.txt
      • Find out what formats are supported (MJPG support, excellent, no encoding required for gstreamer):
      getting src format enumerations
  got 6 format(s):
     YUYV
     MJPG
     YU12 (emulated)
     YV12 (emulated)
     BGR3 (emulated)
     RGB3 (emulated)
      • Find resolutions, frame rates, etc. in debug.txt
      probed caps: video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)720, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 15/2, 5/1 }; video/x-raw, format=(string)YUY2, width=(int)800, height=(int)600, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 15/1, 10/1, 5/1 }; video/x-raw, format=(string)YUY2, width=(int)640, height=(int)480, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)YUY2, width=(int)352, height=(int)288, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)YUY2, width=(int)320, height=(int)240, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)YUY2, width=(int)176, height=(int)144, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)YUY2, width=(int)160, height=(int)120, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; image/jpeg, width=(int)1280, height=(int)720, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; image/jpeg, width=(int)800, height=(int)600, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; image/jpeg, width=(int)640, height=(int)480, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; image/jpeg, width=(int)352, height=(int)288, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; image/jpeg, width=(int)320, height=(int)240, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; image/jpeg, width=(int)176, height=(int)144, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; image/jpeg, width=(int)160, height=(int)120, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)I420, width=(int)1280, height=(int)720, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)I420, width=(int)800, height=(int)600, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)I420, width=(int)640, height=(int)480, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)I420, width=(int)352, height=(int)288, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)I420, width=(int)320, height=(int)240, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)I420, width=(int)176, height=(int)144, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)I420, width=(int)160, height=(int)120, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)YV12, width=(int)1280, height=(int)720, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)YV12, width=(int)800, height=(int)600, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)YV12, width=(int)640, height=(int)480, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)YV12, width=(int)352, height=(int)288, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)YV12, width=(int)320, height=(int)240, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)YV12, width=(int)176, height=(int)144, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)YV12, width=(int)160, height=(int)120, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)BGR, width=(int)1280, height=(int)720, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)BGR, width=(int)800, height=(int)600, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)BGR, width=(int)640, height=(int)480, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)BGR, width=(int)352, height=(int)288, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)BGR, width=(int)320, height=(int)240, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)BGR, width=(int)176, height=(int)144, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)BGR, width=(int)160, height=(int)120, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)RGB, width=(int)1280, height=(int)720, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)RGB, width=(int)800, height=(int)600, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)RGB, width=(int)640, height=(int)480, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)RGB, width=(int)352, height=(int)288, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)RGB, width=(int)320, height=(int)240, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)RGB, width=(int)176, height=(int)144, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }; video/x-raw, format=(string)RGB, width=(int)160, height=(int)120, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction){ 30/1, 25/1, 20/1, 15/1, 10/1, 5/1 }
      • For a more consice list use uvcdynctrl -f 
      Listing available frame formats for device video0:
  Pixel format: YUYV (YUV 4:2:2 (YUYV); MIME type: video/x-raw-yuv)
    Frame size: 640x480
      Frame rates: 30, 25, 20, 15, 10, 5
    Frame size: 352x288
      Frame rates: 30, 25, 20, 15, 10, 5
    Frame size: 320x240
      Frame rates: 30, 25, 20, 15, 10, 5
    Frame size: 176x144
      Frame rates: 30, 25, 20, 15, 10, 5
    Frame size: 160x120
      Frame rates: 30, 25, 20, 15, 10, 5
    Frame size: 800x600
      Frame rates: 15, 10, 5
    Frame size: 1280x720
      Frame intervals: 2/15, 1/5
  Pixel format: MJPG (MJPEG; MIME type: image/jpeg)
    Frame size: 640x480
      Frame rates: 30, 25, 20, 15, 10, 5
    Frame size: 352x288
      Frame rates: 30, 25, 20, 15, 10, 5
    Frame size: 320x240
      Frame rates: 30, 25, 20, 15, 10, 5
    Frame size: 176x144
      Frame rates: 30, 25, 20, 15, 10, 5
    Frame size: 160x120
      Frame rates: 30, 25, 20, 15, 10, 5
    Frame size: 800x600
      Frame rates: 30, 25, 20, 15, 10, 5
    Frame size: 1280x720
      Frame rates: 30, 25, 20, 15, 10, 5
    • Let's see if we can record a 500 frame video
      • export GST_DEBUG="*v4l2*:0"
      • gst-launch-1.0 v4l2src num-buffers=500 ! image/jpeg ! avimux ! filesink location=video.avi
      • Don't worry about libv4l2: error dequeuing buf: Success messages since we will mute those later on
      • SCP video to your desktop PC and see if it recorded correctly
  5. Test streaming over HTTP
    • Run GStreamerMjpeg Python class
      • Copy streamer package to your home dir
      • export PYTHONPATH=/home/<username>/streamer
      • python -u /home/<username>/streamer/GStreamerMjpeg.py
      Launching camera server on port 1337
  Launch input stream thread
  Httpd serve foreverWaiting for input stream from gstreamer...
    • Start another SSH session and run gstreamer pipeline
      • gst-launch-1.0 v4l2src, timeout=5 ! image/jpeg, framerate=30/1, width=320, height=240 ! multipartmux boundary=cvp ! tcpclientsink port=9999&>/dev/null
      Accepted input stream from ('127.0.0.1', 39999)
    • Go to http://192.168.1.69:1337 (change to the IP address to that of the Mini PC) 
      192.168.1.106 - - [22/May/2013 22:19:21] "GET / HTTP/1.1" 200 166
    • At this point you have a streaming MJPEG webcam. You can stop here or you can proceed to step 6 to make your Mini PC an intelligent camera system.
  6. CVP is a Python based system that takes input from video sources such as network cameras, web cams, files, etc. and makes intelligent decisions based on analyzing each frame.
  7. Make copies of linuxroot sd (this will save a hugh amount of time). Note that this will only work on similar Mini PC hardware. You can also make a base install to revert back to in case you screw it up some how.
    • sudo tar -pzcf /home/<username>/linuxroot.tar.gz -C /media/linuxroot .
      • Change and SDHC location as needed.
    • sudo tar -pzxf /home/<username>/linuxroot.tar.gz -C /media/linuxroot
      • Change and SDHC location as needed.
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