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• Piwik Analytics and becoming a Piwik Certified Professional

  10 juillet 2017, par Piwik Core Team — About

  Digital Analytics software

  Piwik Analytics is the leading open source digital analytics software, offering users around the world an opportunity to liberate their analytics. Most recently, they have introduced the Piwik Certified Professional certification exam which now allows users to become qualified in Piwik Analytics software on an individual level to gain a deeper understanding of Piwik. In this blog post I will guide you through the topics that are covered during the exam and provide you with advice on taking the official Piwik Certified Professional exam.

  

  Piwik certification exam

  Taking the exam will cost you a maximum investment of 60 minutes of your time, besides learning all materials of course. The exam consists of 55 multiple choice questions with four answers to choose from. The score needed to pass is 80% (44 questions answered correctly) and the cost is 50 USD total. An earned certificate is valid for 18 months, before these eighteen months are over a person should pass the exam again in order to retain the certified status.

  Learning topics

  The exam consists of two sections. The main section is focused on the Piwik Analytics software itself while the second part relates to digital analytics in general. All topics and content covered about Piwik Analytics is available through the official Piwik user guides. The second section tests your experience as a digital analyst, online marketer or any other function title in which you work with Piwik Analytics. In this case, the general digital analytics questions should be quite straightforward and easy to answer, and cover only a fraction of the total questions in the exam (around 10% with 5-7 general questions). An outline of all exam topics are listed below :

  • A Tour of Piwik
  • Track Goals and Measure Conversions
  • Event Tracking
  • Content Tracking
  • Ecommerce Analytics
  • Row Evolution – View and compare historical data
  • Segmentation – Compare segments of visitors
  • Visitors Maps – World, region, city
  • Real Time Visitor World Map
  • Real Time Analytics
  • The Visitor Profile
  • Site speed and Page speed
  • Site Search Tracking and Reporting
    
  • Transitions – Analyze the previous and following actions of your visitors for each page
  • Page Overlay
  • Custom Variables Analytics
  • Custom Dimensions
  • User ID
  • Annotating your data
  • Tracking Campaigns
  • URL Builder for Marketing Campaign Tracking

  The best way to prepare for the exam is read the entire Piwik user guides. You should definitely read the “Analytics Features” section since most questions of the Piwik Certified Professional – Digital Analytics exam that will be asked come from these sections. Furthermore you should be able to find your way around in Piwik at a basic level which means you know what the reports mean and where to find certain information. In addition, some basic knowledge regarding the settings is useful too. The exam is definitely not a technical implementation exam so no coding knowledge or any other deeply technical knowledge regarding Piwik is required.

  Finally, some general questions will be asked regarding digital analytics covering topics about KPI’s and the role of the analyst within an organization. While Piwik provides some links to articles by Avinash Kaushik covering these topics, you will not be able to learn these topics just by reading. When you have some experience with digital analytics you should be able to answer these general digital analytics questions with common sense and (even basic) experience as a digital analyst, analytics consultant, online marketer or any other related job whereby you work with Piwik.

  Taking the exam

  With 55 questions to be answered in 60 minutes the key to passing the exam is to keep moving. You have about 1 minute and 5 seconds to answer each question. This means that you should focus on the easiest questions first and return later to the questions that are a bit more challenging to answer. Keep an eye on the timer that will be displayed in the exam window. When the time expires or you click ‘Finish test’ your exam will end and be automatically submitted for review. Remember to first check all questions and answers before you click on the ‘Finish test’ button. If you click too soon and you still haven’t answered all questions, all unanswered questions will be marked as incorrect.

  During the test, no hard copy or online materials may be referenced. As you can imagine, it is almost impossible to check if users reference these kind of materials. However, be aware of the penalty system that is in place during the test. When a user leaves from the active test screen to another screen (i.e. a different browser tab) the screen turns red and provides a warning count when the user returns to the test screen again. You will have three warnings, after this your test will be submitted and graded as false. Furthermore, keep in mind you will have to do the test in one go and cannot pause and come back another time.

  Practice makes perfect

  Below I have included some example questions that could be asked during the exam. These questions do not necessarily represent how Piwik will test you on these topics.

  • What is the default report date that is selected by Piwik ?
  • Why would someone flatten a report in Piwik ?
  • Why would a user especially use the Page Overlay report ?
  • What are the three main Ecommerce interactions tracked with Piwik ?
  • What is an example of an anonymized IP address in Piwik ?

  Passing the Piwik Certified Professional – Digital Analytics exam

  Directly after submitting the exam you will receive a notification telling you whether or not you have passed the exam. If you pass, you will be able to download your personal certification right away. A report of your exam performance will also be available. This report lists the amount of correct answers and total questions by topic. The report with your exam performance is also available if you did not pass the exam. The certificate is valid for 18 months from the date of successful completion.

  Sometimes the difference between passing and failing can be a matter of how you interpret some of Piwik’s questions. There are several tricky questions included, so be sure to pay attention to detail on every question. If you fail, you may take the exam again. You will have to pay the 50 USD fee for each try, so do your best to pass it the first time.

  → Register to become a Piwik Certified Professional.

  We wish you the best of luck and happy analytics !

• FFMPEG - Moving text to appear every 'X' Seconds

  9 octobre 2018, par Kevin

  This is a ffmpeg command for moving text (left to right)

  ffmpeg -i input.mp4 -vf drawtext="fontfile=/path/to/fonts/FreeSans.ttf:text='Hello World':fontcolor=white@1.0:fontsize=16:y=h-line_h-100:x=(2*n)-tw" -codec:v libx264 -codec:a copy output.mp4

  And I would like to know how to make the moving text to start after ’X’ seconds and appear every ’X’ seconds ?

• Opencv crosscompile with ffmpeg and other 3rdparty for arm board

  16 juin 2017, par Little Tooth

  After buliding Qt5.5.1 for my arm board sucessfully, I am taking up to crosscompile opencv. Here are the steps :

  First, I crosscompile 3rdparty :

  a.libz

  lmk@lmk-virtual-machine:/home/newdisk$ sudo tar -zvxf zlib-1.2.8.tar.gz
  
  lmk@lmk-virtual-machine:/home/newdisk$ cd zlib-1.2.8
  
  lmk@lmk-virtual-machine:/home/newdisk/zlib-1.2.8$ sudo ./configure --prefix=/home/newdisk/optnew/opencv-rely -shared
  
  lmk@lmk-virtual-machine:/home/newdisk/zlib-1.2.8$ sudo vi Makefile

  and etit Makefile in some details :

  #Makefile
  
  CC=/home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-gcc
  
  LDSHARED= /home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-gcc -shared -Wl,-soname,libz.so.1,--version-script,zlib.map
  
  AR=/home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-ar
  
  RANLIB=arm-linux-ranlib

  the last step is run make and make install :

  lmk@lmk-virtual-machine:/home/newdisk/zlib-1.2.8$ sudo make
  
  lmk@lmk-virtual-machine:/home/newdisk/zlib-1.2.8$ sudo make install

  b.libjpeg

  lmk@lmk-virtual-machine:/home/newdisk$ sudo tar -zvxf jpegsrc.v9.tar.gz
  
  lmk@lmk-virtual-machine:/home/newdisk$ cd jpeg-9
  
  lmk@lmk-virtual-machine:/home/newdisk/jpeg-9$ sudo CC=/home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-gcc ./configure --host=arm-linux --prefix=/home/newdisk/optnew/opencv-rely --enable-shared --enable-static
  
  lmk@lmk-virtual-machine:/home/newdisk/jpeg-9$ sudo make
  
  lmk@lmk-virtual-machine:/home/newdisk/jpeg-9$ sudo make install

  c.libpng

  lmk@lmk-virtual-machine:/home/newdisk$ sudo xz -d libpng-1.6.29.tar.xz
  
  lmk@lmk-virtual-machine:/home/newdisk$ sudo tar -xvf libpng-1.6.29.tar
  
  lmk@lmk-virtual-machine:/home/newdisk$ cd libpng-1.6.29
  
  lmk@lmk-virtual-machine:/home/newdisk/libpng-1.6.29$ sudo CC=/home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-gcc ./configure --host=arm-linux --prefix=/home/newdisk/optnew/opencv-rely --enable-shared --enable-static
  
  lmk@lmk-virtual-machine:/home/newdisk/libpng-1.6.29$ sudo make
  
  lmk@lmk-virtual-machine:/home/newdisk/libpng-1.6.29$ sudo make install

  d.yasm

  lmk@lmk-virtual-machine:/home/newdisk$ sudo tar -zvxf yasm-1.3.0.tar.gz
  
  lmk@lmk-virtual-machine:/home/newdisk$ cd yasm-1.3.0
  
  lmk@lmk-virtual-machine:/home/newdisk/yasm-1.3.0$ sudo CC=/home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-gcc ./configure --prefix=/home/newdisk/optnew/opencv-rely --host=arm-linux
  
  lmk@lmk-virtual-machine:/home/newdisk/yasm-1.3.0$ sudo make
  
  lmk@lmk-virtual-machine:/home/newdisk/yasm-1.3.0$ sudo make install

  e.libx264

  lmk@lmk-virtual-machine:/home/newdisk$ sudo tar -jxvf last_x264.tar.bz2
  
  lmk@lmk-virtual-machine:/home/newdisk$ cd x264-snapshot-20170612-2245 
  
  lmk@lmk-virtual-machine:/home/newdisk/x264-snapshot-20170612-2245$ sudo CC=/home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-gcc ./configure --enable-shared --host=arm-linux --disable-asm --prefix=/home/newdisk/optnew/opencv-rely
  
  lmk@lmk-virtual-machine:/home/newdisk/x264-snapshot-20170612-2245$ sudo make
  
  lmk@lmk-virtual-machine:/home/newdisk/x264-snapshot-20170612-2245$ sudo make install

  f.libxvid

  lmk@lmk-virtual-machine:/home/newdisk$ cd xvidcore-1.3.3
  
  lmk@lmk-virtual-machine:/home/newdisk/xvidcore-1.3.3$ cd build/generic
  
  lmk@lmk-virtual-machine:/home/newdisk/xvidcore-1.3.3/build/generic$ sudo CC=/home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-gcc ./configure --prefix=/home/newdisk/optnew/opencv-rely --host=arm-linux  --disable-assembly
  
  lmk@lmk-virtual-machine:/home/newdisk/xvidcore-1.3.3/build/generic$ sudo make
  
  lmk@lmk-virtual-machine:/home/newdisk/xvidcore-1.3.3/build/generic$ sudo make install

  g.ffmpeg

  lmk@lmk-virtual-machine:/home/newdisk$ sudo tar -jvxf ffmpeg-3.3.2.tar.bz2
  
  lmk@lmk-virtual-machine:/home/newdisk$ cd ffmpeg-3.3.2
  
  lmk@lmk-virtual-machine:/home/newdisk/ffmpeg-3.3.2$
  
  sudo ./configure --prefix=/home/newdisk/optnew/opencv-rely --enable-shared --disable-static --enable-gpl --enable-cross-compile  --arch=arm --disable-stripping --target-os=linux --enable-libx264 --enable-libxvid --cc=/home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-gcc --enable-swscale --extra-ldflags=-L/home/newdisk/optnew/opencv-rely/lib --extra-cflags=-I/home/newdisk/optnew/opencv-rely/include
  
  lmk@lmk-virtual-machine:/home/newdisk/ffmpeg-3.3.2$ sudo make
  
  lmk@lmk-virtual-machine:/home/newdisk/ffmpeg-3.3.2$ sudo make install

  There is no problem in 3rdparty crosscompile.
  Next, opencv crosscompile :

  lmk@lmk-virtual-machine:/home/newdisk$ sudo unzip opencv-3.1.0.zip
  
  lmk@lmk-virtual-machine:/home/newdisk$ cd opencv-3.1.0
  
  lmk@lmk-virtual-machine:/home/newdisk/opencv-3.1.0$ sudo mkdir BuildOpencv
  
  lmk@lmk-virtual-machine:/home/newdisk/opencv-3.1.0$ cd BuildOpencv
  
  lmk@lmk-virtual-machine:/home/newdisk/opencv-3.1.0/BuildOpencv$ sudo vim toolchain.cmake
  
  #toolchain.cmake
  
  ###########user defined#############
  
  set( CMAKE_SYSTEM_NAME Linux )
  
  set( CMAKE_SYSTEM_PROCESSOR arm )
  
  set( CMAKE_C_COMPILER /home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-linux-gcc )
  
  set( CMAKE_CXX_COMPILER /home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-linux-g++ )
  
  ###########user defined#############
  
  set( CMAKE_FIND_ROOT_PATH /home/newdisk/optnew/opencv-rely)
  
  set( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER )
  
  set( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
  
  set( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
  
  ######################################

  Then I run cmake :

  lmk@lmk-virtual-machine:/home/newdisk/opencv-3.1.0/BuildOpencv$ sudo cmake -DCMAKE_TOOLCHAIN_FILE=toolchain.cmake ../

  Here is the result：

  -- Detected version of GNU GCC: 45 (405)
  
  -- Found ZLIB: /home/newdisk/optnew/opencv-rely/lib/libz.so (found suitable version "1.2.8", minimum required is "1.2.3") 
  
  -- Could NOT find TIFF (missing:  TIFF_LIBRARY TIFF_INCLUDE_DIR) 
  
  -- Could NOT find Jasper (missing:  JASPER_LIBRARIES) (found version "1.900.1")
  
  -- Found ZLIB: /home/newdisk/optnew/opencv-rely/lib/libz.so (found version "1.2.8") 
  
  -- checking for module 'gtk+-3.0'
  
  --   package 'gtk+-3.0' not found
  
  -- checking for module 'gstreamer-base-1.0'
  
  --   package 'gstreamer-base-1.0' not found
  
  -- checking for module 'gstreamer-video-1.0'
  
  --   package 'gstreamer-video-1.0' not found
  
  -- checking for module 'gstreamer-app-1.0'
  
  --   package 'gstreamer-app-1.0' not found
  
  -- checking for module 'gstreamer-riff-1.0'
  
  --   package 'gstreamer-riff-1.0' not found
  
  -- checking for module 'gstreamer-pbutils-1.0'
  
  --   package 'gstreamer-pbutils-1.0' not found
  
  -- checking for module 'gstreamer-base-0.10'
  
  --   package 'gstreamer-base-0.10' not found
  
  -- checking for module 'gstreamer-video-0.10'
  
  --   package 'gstreamer-video-0.10' not found
  
  -- checking for module 'gstreamer-app-0.10'
  
  --   package 'gstreamer-app-0.10' not found
  
  -- checking for module 'gstreamer-riff-0.10'
  
  --   package 'gstreamer-riff-0.10' not found
  
  -- checking for module 'gstreamer-pbutils-0.10'
  
  --   package 'gstreamer-pbutils-0.10' not found
  
  -- Looking for linux/videodev.h
  
  -- Looking for linux/videodev.h - found
  
  -- Looking for linux/videodev2.h
  
  -- Looking for linux/videodev2.h - found
  
  -- Looking for sys/videoio.h
  
  -- Looking for sys/videoio.h - not found
  
  -- checking for module 'libavresample'
  
  --   package 'libavresample' not found
  
  -- Looking for libavformat/avformat.h
  
  -- Looking for libavformat/avformat.h - not found
  
  -- Looking for ffmpeg/avformat.h
  
  -- Looking for ffmpeg/avformat.h - not found
  
  -- checking for module 'libgphoto2'
  
   --   package 'libgphoto2' not found
  
  -- Could NOT find Doxygen (missing:  DOXYGEN_EXECUTABLE) 
  
  -- To enable PlantUML support, set PLANTUML_JAR environment variable or pass -DPLANTUML_JAR=<filepath> option to cmake
  
  -- Found PythonInterp: /usr/bin/python2.7 (found suitable version "2.7.6", minimum required is "2.7") 
  
  -- Could NOT find PythonLibs (missing:  PYTHON_LIBRARIES) (found suitable version "2.7.6", minimum required is "2.7")
  
  -- Cannot probe for Python/Numpy support (because we are cross-compiling OpenCV)
  
  -- If you want to enable Python/Numpy support, set the following variables:
  
  --   PYTHON2_INCLUDE_PATH
  
  --   PYTHON2_LIBRARIES
  
  --   PYTHON2_NUMPY_INCLUDE_DIRS
  
  --   PYTHON3_INCLUDE_PATH
  
  --   PYTHON3_LIBRARIES
  
  --   PYTHON3_NUMPY_INCLUDE_DIRS
  
  -- Found PythonInterp: /usr/bin/python3.4 (found suitable version "3.4.3", minimum required is "3.4") 
  
  -- Could NOT find PythonLibs (missing:  PYTHON_LIBRARIES) (Required is at least version "3.4")
  
  -- Cannot probe for Python/Numpy support (because we are cross-compiling OpenCV)
  
  -- If you want to enable Python/Numpy support, set the following variables:
  
  --   PYTHON2_INCLUDE_PATH
  
  --   PYTHON2_LIBRARIES
  
  --   PYTHON2_NUMPY_INCLUDE_DIRS
  
  --   PYTHON3_INCLUDE_PATH
  
  --   PYTHON3_LIBRARIES
  
  --   PYTHON3_NUMPY_INCLUDE_DIRS
  
  -- Could NOT find JNI (missing:  JAVA_AWT_LIBRARY JAVA_JVM_LIBRARY JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH) 
  
  -- Could NOT find Matlab (missing:  MATLAB_MEX_SCRIPT MATLAB_INCLUDE_DIRS MATLAB_ROOT_DIR MATLAB_LIBRARIES MATLAB_LIBRARY_DIRS MATLAB_MEXEXT MATLAB_ARCH MATLAB_BIN) 
  
  -- 
  
  -- General configuration for OpenCV 3.1.0 
  
  =====================================
  
  --   Version control:               unknown
  
  -- 
  
  --   Platform:
  
  --     Host:                        Linux 3.16.0-77-generic i686
  
  --     Target:                      Linux arm
  
  --     CMake:                       2.8.12.2
  
  --     CMake generator:             Unix Makefiles
  
  --     CMake build tool:            /usr/bin/make
  
  --     Configuration:               Release
  
  -- 
  
  --   C/C++:
  
  --     Built as dynamic libs?:      YES
  
  --     C++ Compiler:                /home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-linux-g++  (ver 4.5.1)
  
  --     C++ flags (Release):         -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG  -DNDEBUG
  
  --     C++ flags (Debug):           -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fvisibility=hidden -fvisibility-inlines-hidden -g  -O0 -DDEBUG -D_DEBUG
  
  --     C Compiler:                  /home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-linux-gcc
  
  --     C flags (Release):           -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fvisibility=hidden -O3 -DNDEBUG  -DNDEBUG
  
  --     C flags (Debug):             -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fvisibility=hidden -g  -O0 -DDEBUG -D_DEBUG
  
  --     Linker flags (Release):      
  
  --     Linker flags (Debug):        
  
  --     Precompiled headers:         YES
  
  --     Extra dependencies:          /home/newdisk/optnew/opencv-rely/lib/libjpeg.so /home/newdisk/optnew/opencv-rely/lib/libpng.so /home/newdisk/optnew/opencv-rely/lib/libz.so gtk-x11-2.0 gdk-x11-2.0 atk-1.0 gio-2.0 pangoft2-1.0 pangocairo-1.0 gdk_pixbuf-2.0 cairo pango-1.0 fontconfig gobject-2.0 freetype gthread-2.0 glib-2.0 dc1394 v4l1 v4l2 avcodec avformat avutil swscale dl m pthread rt
  
  --     3rdparty dependencies:       libwebp libtiff libjasper IlmImf
  
  -- 
  
  --   OpenCV modules:
  
  --     To be built:                 core flann imgproc ml photo video imgcodecs shape videoio highgui objdetect superres ts features2d calib3d stitching videostab
  
  --     Disabled:                    world
  
  --     Disabled by dependency:      -
  
  --     Unavailable:                 cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev java python2 python3 viz
  
  -- 
  
  --   GUI: 
  
  --     QT:                          NO
  
  --     GTK+ 2.x:                    YES (ver 2.24.23)
  
  --     GThread :                    YES (ver 2.40.2)
  
  --     GtkGlExt:                    NO
  
  --     OpenGL support:              NO
  
  --     VTK support:                 NO
  
  -- 
  
  --   Media I/O: 
  
  --     ZLib:                        /home/newdisk/optnew/opencv-rely/lib/libz.so (ver 1.2.8)
  
  --     JPEG:                        /home/newdisk/optnew/opencv-rely/lib/libjpeg.so (ver 90)
  
  --     WEBP:                        build (ver 0.3.1)
  
  --     PNG:                         /home/newdisk/optnew/opencv-rely/lib/libpng.so (ver 1.6.29)
  
  --     TIFF:                        build (ver 42 - 4.0.2)
  
  --     JPEG 2000:                   build (ver 1.900.1)
  
  --     OpenEXR:                     build (ver 1.7.1)
  
  --     GDAL:                        NO
  
  -- 
  
  --   Video I/O:
  
  --     DC1394 1.x:                  NO
  
  --     DC1394 2.x:                  YES (ver 2.2.1)
  
  --     FFMPEG:                      YES
  
  --       codec:                     YES (ver 54.35.1)
  
  --       format:                    YES (ver 54.20.4)
  
  --       util:                      YES (ver 52.3.0)
  
  --       swscale:                   YES (ver 2.1.1)
  
  --       resample:                  NO
  
  --       gentoo-style:              YES
  
  --     GStreamer:                   NO
  
  --     OpenNI:                      NO
  
  --     OpenNI PrimeSensor Modules:  NO
  
  --     OpenNI2:                     NO
  
  --     PvAPI:                       NO
  
  --     GigEVisionSDK:               NO
  
  --     UniCap:                      NO
  
  --     UniCap ucil:                 NO
  
  --     V4L/V4L2:                    Using libv4l1 (ver 0.8.8) / libv4l2 (ver 0.8.8)
  
  --     XIMEA:                       NO
  
  --     Xine:                        NO
  
  --     gPhoto2:                     NO
  
  -- 
  
  --   Parallel framework:            pthreads
  
  -- 
  
  --   Other third-party libraries:
  
  --     Use IPP:                     NO
  
  --     Use VA:                      NO
  
  --     Use Intel VA-API/OpenCL:     NO
  
  --     Use Eigen:                   NO
  
  --     Use Cuda:                    NO
  
  --     Use OpenCL:                  YES
  
  --     Use custom HAL:              NO
  
  -- 
  
  --   OpenCL:
  
  --     Version:                     dynamic
  
  --     Include path:                /home/newdisk/opencv-3.1.0/3rdparty/include/opencl/1.2
  
  --     Use AMDFFT:                  NO
  
  --      Use AMDBLAS:                 NO
  
  -- 
  
  --   Python 2:
  
  --     Interpreter:                 /usr/bin/python2.7 (ver 2.7.6)
  
  -- 
  
  --   Python 3:
  
  --     Interpreter:                 /usr/bin/python3.4 (ver 3.4.3)
  
  -- 
  
  --   Python (for build):            /usr/bin/python2.7
  
  -- 
  
  --   Java:
  
  --     ant:                         NO
  
  --     JNI:                         NO
  
  --     Java wrappers:               NO
  
  --     Java tests:                  NO
  
  -- 
  
  --   Matlab:                        Matlab not found or implicitly disabled
  
  -- 
  
  --   Documentation:
  
  --     Doxygen:                     NO
  
  --     PlantUML:                    NO
  
  -- 
  
  --   Tests and samples:
  
  --     Tests:                       YES
  
  --     Performance tests:           YES
  
  --     C/C++ Examples:              NO
  
  -- 
  
  --   Install path:                  /home/newdisk/opencv-3.1.0/BuildOpencv/install
  
  -- 
  
  --   cvconfig.h is in:              /home/newdisk/opencv-3.1.0/BuildOpencv
  
  -- -----------------------------------------------------------------
  
  -- 
  
  -- Configuring done
  
  -- Generating done
  
  -- Build files have been written to: /home/newdisk/opencv-3.1.0/BuildOpencv
  
  </filepath>

  After configuring and generating, run cmake-gui :

  lmk@lmk-virtual-machine:/home/newdisk/opencv-3.1.0/BuildOpencv$ sudo cmake-gui
  
  
  
  Src:/home/newdisk/opencv-3.1.0
  
  Build:/home/newdisk/opencv-3.1.0/BuildOpencv
  
  
  
  CMAKE_INSTALL_PREFIX:/home/newdisk/optnew/opencv-arm
  
  
  
  Don't choose these items:
  
  WITH_CUDA
  
  WITH_GTK
  
  WITH_1394
  
  WITH_GSTREAMER
  
  WITH_LIBV4L 
  
  WITH_TIFF
  
  BUILD_OPENEXR
  
  WITH_OPENEXR
  
  WITH_OPENCL
  
  
  
  Configure and generate.
  
  
  
  lmk@lmk-virtual-machine:/home/newdisk/opencv-3.1.0/BuildOpencv$ sudo vi CMakeCache.txt
  
  #CMakeCache.txt
  
  //Flags used by the linker.
  
  CMAKE_EXE_LINKER_FLAGS:STRING=-lpthread -lrt
  
  
  
  lmk@lmk-virtual-machine:/home/newdisk/opencv-3.1.0/BuildOpencv$ sudo make

  Fianlly,I got these errors :

  [ 27%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_mjpeg_decoder.cpp.o
  
  [ 27%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_v4l.cpp.o
  
  [ 27%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_ffmpeg.cpp.o
  
  In file included from /home/newdisk/opencv-3.1.0/modules/videoio/src/cap_ffmpeg_impl.hpp:65:0,
  
               from /home/newdisk/opencv-3.1.0/modules/videoio/src/cap_ffmpeg.cpp:45:
  
  /home/newdisk/opencv-3.1.0/modules/videoio/src/ffmpeg_codecs.hpp:77:36: fatal error: libavformat/avformat.h: No such file or directory
  
  compilation terminated.
  
  make[2]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_ffmpeg.cpp.o] Error 1
  
  make[1]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/all] Error 2
  
  make: *** [all] Error 2

  While the file libavformat/avformat.h does exits in my directory
  /home/newdisk/optnew/opencv-rely/include

  Why can cmake find lib directory

  -- Found ZLIB: /home/newdisk/optnew/opencv-rely/lib/libz.so (found suitable version "1.2.8", minimum required is "1.2.3")

  but cannot find include directory ?

  /home/newdisk/optnew/opencv-rely/include

  Do you have any idea ?