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• 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 ?

• trying to make OpenCV 3.2.0 work with virtualenv

  24 juillet 2017, par lollercoaster

  I’m on Ubuntu 16.04 with Python 2.7 and virtualenv & virtualenvwrapper.

  By following this guide I managed to get the following script working with my system Python2.7 which has cv2 globally installed.

  I used this script to install it :

  ######################################
  
  # INSTALL OPENCV ON UBUNTU OR DEBIAN #
  
  ######################################
  
  
  
  # |         THIS SCRIPT IS TESTED CORRECTLY ON         |
  
  # |----------------------------------------------------|
  
  # | OS             | OpenCV       | Test | Last test   |
  
  # |----------------|--------------|------|-------------|
  
  # | Ubuntu 16.04.2 | OpenCV 3.2.0 | OK   | 20 May 2017 |
  
  # | Debian 8.8     | OpenCV 3.2.0 | OK   | 20 May 2017 |
  
  # | Debian 9.0     | OpenCV 3.2.0 | OK   | 25 Jun 2017 |
  
  
  
  # 1. KEEP UBUNTU OR DEBIAN UP TO DATE
  
  
  
  sudo apt-get -y update
  
  sudo apt-get -y upgrade
  
  sudo apt-get -y dist-upgrade
  
  sudo apt-get -y autoremove
  
  
  
  
  
  # 2. INSTALL THE DEPENDENCIES
  
  
  
  # Build tools:
  
  sudo apt-get install -y build-essential cmake
  
  
  
  # GUI (if you want to use GTK instead of Qt, replace 'qt5-default' with 'libgtkglext1-dev' and remove '-DWITH_QT=ON' option in CMake):
  
  sudo apt-get install -y qt5-default libvtk6-dev
  
  
  
  # Media I/O:
  
  sudo apt-get install -y zlib1g-dev libjpeg-dev libwebp-dev libpng-dev libtiff5-dev libjasper-dev libopenexr-dev libgdal-dev
  
  
  
  # Video I/O:
  
  sudo apt-get install -y libdc1394-22-dev libavcodec-dev libavformat-dev libswscale-dev libtheora-dev libvorbis-dev libxvidcore-dev libx264-dev yasm libopencore-amrnb-dev libopencore-amrwb-dev libv4l-dev libxine2-dev
  
  
  
  # Parallelism and linear algebra libraries:
  
  sudo apt-get install -y libtbb-dev libeigen3-dev
  
  
  
  # Python:
  
  sudo apt-get install -y python-dev python-tk python-numpy python3-dev python3-tk python3-numpy
  
  
  
  # Documentation:
  
  sudo apt-get install -y doxygen
  
  
  
  # UI stuff
  
  sudo apt-get install libgtk-3-dev libatlas-base-dev gfortran
  
  
  
  
  
  # 3. INSTALL THE LIBRARY (YOU CAN CHANGE '3.2.0' FOR THE LAST STABLE VERSION)
  
  sudo apt-get install -y unzip wget
  
  
  
  # opencv contrib
  
  wget https://github.com/opencv/opencv_contrib/archive/3.2.0.zip -O opencv_contrib-3.2.0.zip
  
  unzip opencv_contrib-3.2.0.zip
  
  rm opencv_contrib-3.2.0.zip
  
  
  
  # opencv
  
  wget https://github.com/opencv/opencv/archive/3.2.0.zip
  
  unzip 3.2.0.zip
  
  rm 3.2.0.zip
  
  mv opencv-3.2.0 OpenCV-3.2.0
  
  cd OpenCV-3.2.0
  
  
  
  mkdir build
  
  cd build
  
  cmake -D WITH_QT=ON \
  
      -D WITH_OPENGL=ON \
  
      -D FORCE_VTK=ON \
  
      -D WITH_TBB=ON \
  
      -D WITH_GDAL=ON \
  
      -D WITH_XINE=ON \
  
      -D BUILD_EXAMPLES=ON \
  
      -D INSTALL_PYTHON_EXAMPLES=ON \
  
      -D ENABLE_PRECOMPILED_HEADERS=OFF \
  
      -D BUILD_NEW_PYTHON_SUPPORT=ON \
  
      ..
  
  
  
  make -j4
  
  sudo make install
  
  sudo ldconfig
  
  
  
  
  
  # 4. EXECUTE SOME OPENCV EXAMPLES AND COMPILE A DEMONSTRATION
  
  
  
  # To complete this step, please visit 'http://milq.github.io/install-opencv-ubuntu-debian'.

  The following script below works great with that system-wide installation :

  import cv2
  
  
  
  img = cv2.imread('some_img.jpg')

  Though this one doesn’t - even the system Python can’t read videos for some reason...

  import cv2
  
  
  
  video_capture = cv2.VideoCapture(0)
  
  ret, frame = video_capture.read()
  
  print ret  # always False

  but I want it to work with my virtualenv. So I recompiled OpenCV with :

  cmake -D WITH_QT=ON \
  
      -D WITH_OPENGL=ON \
  
      -D FORCE_VTK=ON \
  
      -D WITH_TBB=ON \
  
      -D WITH_GDAL=ON \
  
      -D WITH_XINE=ON \
  
      -D BUILD_EXAMPLES=ON \
  
      -D INSTALL_PYTHON_EXAMPLES=ON \
  
      -D ENABLE_PRECOMPILED_HEADERS=OFF \
  
      -D BUILD_NEW_PYTHON_SUPPORT=ON \
  
      -D OPENCV_EXTRA_MODULES_PATH=/home/me/code/myproject/opencv_contrib-3.2.0/modules \
  
      -D PYTHON_EXECUTABLE=~/.envs/myenv/bin/python \
  
      ..
  
  
  
  make -j4
  
  sudo make install
  
  sudo ldconfig

  Here’s the CMake log :

  -- Found VTK ver. 6.2.0 (usefile: /usr/lib/cmake/vtk-6.2/UseVTK.cmake)
  
  -- Caffe:   NO
  
  -- Protobuf:   YES
  
  -- Glog:   NO
  
  -- freetype2:   YES
  
  -- harfbuzz:    YES
  
  -- Module opencv_sfm disabled because the following dependencies are not found: Glog/Gflags
  
  -- freetype2:   YES
  
  -- harfbuzz:    YES
  
  -- Checking for modules 'tesseract;lept'
  
  --   No package 'tesseract' found
  
  --   No package 'lept' found
  
  -- Tesseract:   NO
  
  -- Check contents of vgg_generated_48.i ...
  
  -- Check contents of vgg_generated_64.i ...
  
  -- Check contents of vgg_generated_80.i ...
  
  -- Check contents of vgg_generated_120.i ...
  
  -- Check contents of boostdesc_bgm.i ...
  
  -- Check contents of boostdesc_bgm_bi.i ...
  
  -- Check contents of boostdesc_bgm_hd.i ...
  
  -- Check contents of boostdesc_binboost_064.i ...
  
  -- Check contents of boostdesc_binboost_128.i ...
  
  -- Check contents of boostdesc_binboost_256.i ...
  
  -- Check contents of boostdesc_lbgm.i ...
  
  -- 
  
  -- General configuration for OpenCV 3.2.0 =====================================
  
  --   Version control:               817bd7b-dirty
  
  -- 
  
  --   Extra modules:
  
  --     Location (extra):            /home/me/code/myproject/opencv_contrib-3.2.0/modules
  
  --     Version control (extra):     817bd7b-dirty
  
  -- 
  
  --   Platform:
  
  --     Timestamp:                   2017-07-20T18:25:26Z
  
  --     Host:                        Linux 4.8.0-58-generic x86_64
  
  --     CMake:                       3.5.1
  
  --     CMake generator:             Unix Makefiles
  
  --     CMake build tool:            /usr/bin/make
  
  --     Configuration:               Release
  
  -- 
  
  --   C/C++:
  
  --     Built as dynamic libs?:      YES
  
  --     C++ Compiler:                /usr/bin/c++  (ver 5.4.0)
  
  --     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 -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -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 -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -ffunction-sections -fvisibility=hidden -fvisibility-inlines-hidden -g  -O0 -DDEBUG -D_DEBUG
  
  --     C Compiler:                  /usr/bin/cc
  
  --     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 -Wno-narrowing -Wno-comment -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -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 -Wno-narrowing -Wno-comment -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -ffunction-sections -fvisibility=hidden -g  -O0 -DDEBUG -D_DEBUG
  
  --     Linker flags (Release):
  
  --     Linker flags (Debug):
  
  --     ccache:                      NO
  
  --     Precompiled headers:         NO
  
  --     Extra dependencies:          Qt5::Test Qt5::Concurrent Qt5::OpenGL /usr/lib/x86_64-linux-gnu/libwebp.so /usr/lib/x86_64-linux-gnu/libjasper.so /usr/lib/x86_64-linux-gnu/libImath.so /usr/lib/x86_64-linux-gnu/libIlmImf.so /usr/lib/x86_64-linux-gnu/libIex.so /usr/lib/x86_64-linux-gnu/libHalf.so /usr/lib/x86_64-linux-gnu/libIlmThread.so /usr/lib/libgdal.so dc1394 xine avcodec-ffmpeg avformat-ffmpeg avutil-ffmpeg swscale-ffmpeg Qt5::Core Qt5::Gui Qt5::Widgets /usr/lib/x86_64-linux-gnu/hdf5/serial/lib/libhdf5.so /usr/lib/x86_64-linux-gnu/libpthread.so /usr/lib/x86_64-linux-gnu/libsz.so /usr/lib/x86_64-linux-gnu/libdl.so /usr/lib/x86_64-linux-gnu/libm.so vtkRenderingOpenGL vtkImagingHybrid vtkIOImage vtkCommonDataModel vtkCommonMath vtkCommonCore vtksys vtkCommonMisc vtkCommonSystem vtkCommonTransforms vtkCommonExecutionModel vtkDICOMParser vtkIOCore /usr/lib/x86_64-linux-gnu/libz.so vtkmetaio /usr/lib/x86_64-linux-gnu/libjpeg.so /usr/lib/x86_64-linux-gnu/libpng.so /usr/lib/x86_64-linux-gnu/libtiff.so vtkImagingCore vtkRenderingCore vtkCommonColor vtkFiltersExtraction vtkFiltersCore vtkFiltersGeneral vtkCommonComputationalGeometry vtkFiltersStatistics vtkImagingFourier vtkalglib vtkFiltersGeometry vtkFiltersSources vtkInteractionStyle vtkRenderingLOD vtkFiltersModeling vtkIOPLY vtkIOGeometry /usr/lib/x86_64-linux-gnu/libjsoncpp.so vtkFiltersTexture vtkRenderingFreeType /usr/lib/x86_64-linux-gnu/libfreetype.so vtkftgl vtkIOExport vtkRenderingAnnotation vtkImagingColor vtkRenderingContext2D vtkRenderingGL2PS vtkRenderingContextOpenGL /usr/lib/libgl2ps.so vtkRenderingLabel dl m pthread rt /usr/lib/x86_64-linux-gnu/libGLU.so /usr/lib/x86_64-linux-gnu/libGL.so tbb
  
  --     3rdparty dependencies:       libprotobuf
  
  -- 
  
  --   OpenCV modules:
  
  --     To be built:                 core flann hdf imgproc ml photo reg surface_matching video viz dnn freetype fuzzy imgcodecs shape videoio highgui objdetect plot superres ts xobjdetect xphoto bgsegm bioinspired dpm face features2d line_descriptor saliency text calib3d ccalib cvv datasets rgbd stereo tracking videostab xfeatures2d ximgproc aruco optflow phase_unwrapping stitching structured_light java python2 python3
  
  --     Disabled:                    world contrib_world
  
  --     Disabled by dependency:      -
  
  --     Unavailable:                 cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev cnn_3dobj matlab sfm
  
  -- 
  
  --   GUI: 
  
  --     QT 5.x:                      YES (ver 5.5.1)
  
  --     QT OpenGL support:           YES (Qt5::OpenGL 5.5.1)
  
  --     OpenGL support:              YES (/usr/lib/x86_64-linux-gnu/libGLU.so /usr/lib/x86_64-linux-gnu/libGL.so)
  
  --     VTK support:                 YES (ver 6.2.0)
  
  -- 
  
  --   Media I/O: 
  
  --     ZLib:                        /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.8)
  
  --     JPEG:                        /usr/lib/x86_64-linux-gnu/libjpeg.so (ver )
  
  --     WEBP:                        /usr/lib/x86_64-linux-gnu/libwebp.so (ver encoder: 0x0202)
  
  --     PNG:                         /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.2.54)
  
  --     TIFF:                        /usr/lib/x86_64-linux-gnu/libtiff.so (ver 42 - 4.0.6)
  
  --     JPEG 2000:                   /usr/lib/x86_64-linux-gnu/libjasper.so (ver 1.900.1)
  
  --     OpenEXR:                     /usr/lib/x86_64-linux-gnu/libImath.so /usr/lib/x86_64-linux-gnu/libIlmImf.so /usr/lib/x86_64-linux-gnu/libIex.so /usr/lib/x86_64-linux-gnu/libHalf.so /usr/lib/x86_64-linux-gnu/libIlmThread.so (ver 2.2.0)
  
  --     GDAL:                        /usr/lib/libgdal.so
  
  --     GDCM:                        NO
  
  -- 
  
  --   Video I/O:
  
  --     DC1394 1.x:                  NO
  
  --     DC1394 2.x:                  YES (ver 2.2.4)
  
  --     FFMPEG:                      YES
  
  --       avcodec:                   YES (ver 56.60.100)
  
  --       avformat:                  YES (ver 56.40.101)
  
  --       avutil:                    YES (ver 54.31.100)
  
  --       swscale:                   YES (ver 3.1.101)
  
  --       avresample:                NO
  
  --     GStreamer:                   NO
  
  --     OpenNI:                      NO
  
  --     OpenNI PrimeSensor Modules:  NO
  
  --     OpenNI2:                     NO
  
  --     PvAPI:                       NO
  
  --     GigEVisionSDK:               NO
  
  --     Aravis SDK:                  NO
  
  --     UniCap:                      NO
  
  --     UniCap ucil:                 NO
  
  --     V4L/V4L2:                    NO/YES
  
  --     XIMEA:                       NO
  
  --     Xine:                        YES (ver 1.2.6)
  
  --     gPhoto2:                     NO
  
  -- 
  
  --   Parallel framework:            TBB (ver 4.4 interface 9002)
  
  -- 
  
  --   Other third-party libraries:
  
  --     Use IPP:                     9.0.1 [9.0.1]
  
  --          at:                     /home/me/code/myproject/OpenCV-3.2.0/build/3rdparty/ippicv/ippicv_lnx
  
  --     Use IPP Async:               NO
  
  --     Use VA:                      NO
  
  --     Use Intel VA-API/OpenCL:     NO
  
  --     Use Lapack:                  NO
  
  --     Use Eigen:                   YES (ver 3.2.92)
  
  --     Use Cuda:                    NO
  
  --     Use OpenCL:                  YES
  
  --     Use OpenVX:                  NO
  
  --     Use custom HAL:              NO
  
  -- 
  
  --   OpenCL:                        <dynamic loading="loading" of="of" opencl="opencl" library="library">
  
  --     Include path:                /home/me/code/myproject/OpenCV-3.2.0/3rdparty/include/opencl/1.2
  
  --     Use AMDFFT:                  NO
  
  --     Use AMDBLAS:                 NO
  
  -- 
  
  --   Python 2:
  
  --     Interpreter:                 /home/me/.envs/myenv/bin/python (ver 2.7.12)
  
  --     Libraries:                   /usr/lib/x86_64-linux-gnu/libpython2.7.so (ver 2.7.12)
  
  --     numpy:                       /home/me/.envs/myenv/local/lib/python2.7/site-packages/numpy/core/include (ver 1.13.1)
  
  --     packages path:               lib/python2.7/site-packages
  
  -- 
  
  --   Python 3:
  
  --     Interpreter:                 /usr/bin/python3 (ver 3.5.2)
  
  --     Libraries:                   /usr/lib/x86_64-linux-gnu/libpython3.5m.so (ver 3.5.2)
  
  --     numpy:                       /usr/lib/python3/dist-packages/numpy/core/include (ver 1.11.0)
  
  --     packages path:               lib/python3.5/dist-packages
  
  -- 
  
  --   Python (for build):            /home/me/.envs/myenv/bin/python
  
  -- 
  
  --   Java:
  
  --     ant:                         /usr/bin/ant (ver 1.9.6)
  
  --     JNI:                         /usr/lib/jvm/default-java/include /usr/lib/jvm/default-java/include/linux /usr/lib/jvm/default-java/include
  
  --     Java wrappers:               YES
  
  --     Java tests:                  YES
  
  -- 
  
  --   Matlab:                        Matlab not found or implicitly disabled
  
  -- 
  
  --   Documentation:
  
  --     Doxygen:                     /usr/bin/doxygen (ver 1.8.11)
  
  -- 
  
  --   Tests and samples:
  
  --     Tests:                       YES
  
  --     Performance tests:           YES
  
  --     C/C++ Examples:              YES
  
  -- 
  
  --   Install path:                  /usr/local
  
  -- 
  
  --   cvconfig.h is in:              /home/me/code/myproject/OpenCV-3.2.0/build
  
  -- -----------------------------------------------------------------
  
  -- 
  
  </dynamic>

  Unfortunately, while this works and I can import cv2 in the shell, it cannot read video using the above script, probably due to incorrect compilation or linking of ffmpeg ? The confusing part is the system-wide installation of OpenCV works fine, even without ffmpeg installed !

  What am I doing wrong ? How can I get OpenCV working with a virtualenv ?

  ====

  EDIT : Running the C++ video writing example has this result :

  $ cd /home/me/code/myproject/OpenCV-3.2.0/build/bin
  
  $ ./cpp-tutorial-video-write ../../samples/data/vtest.avi R Y
  
  ------------------------------------------------------------------------------
  
  This program shows how to write video files.
  
  You can extract the R or G or B color channel of the input video.
  
  Usage:
  
  ./video-write  [ R | G | B] [Y | N]
  
  ------------------------------------------------------------------------------
  
  
  
  OpenCV: FFMPEG: tag 0xffffffff/'����' is not found (format 'avi / AVI (Audio Video Interleaved)')'
  
  
  
  (cpp-tutorial-video-write:19523): GStreamer-CRITICAL **: gst_element_make_from_uri: assertion 'gst_uri_is_valid (uri)' failed
  
  OpenCV Error: Unsupported format or combination of formats (Gstreamer Opencv backend does not support this codec.) in CvVideoWriter_GStreamer::open, file /home/me/code/myproject/OpenCV-3.2.0/modules/videoio/src/cap_gstreamer.cpp, line 1388
  
  VIDEOIO(cvCreateVideoWriter_GStreamer(filename, fourcc, fps, frameSize, is_color)): raised OpenCV exception:
  
  
  
  /home/me/code/myproject/OpenCV-3.2.0/modules/videoio/src/cap_gstreamer.cpp:1388: error: (-210) Gstreamer Opencv backend does not support this codec. in function CvVideoWriter_GStreamer::open
  
  
  
  Could not open the output video for write: ../../samples/data/vtest.avi

  And the opencv_test_videoio unit test reports the following : https://pastebin.com/q4mf224Q

  However, running the c++ video starter example DOES work, with the following command and output, I can see the webcam working and streaming video in the highgui interface :

  $ ./cpp-example-videocapture_starter 0
  
  VIDEOIO ERROR: V4L: device 0: Unable to query number of channels
  
  (ERROR)icvOpenAVI_XINE(): Unable to initialize video driver.
  
  GStreamer: Error opening bin: no element "0"
  
  press space to save a picture. q or esc to quit
  
  init done
  
  opengl support available

• Revisiting Nosefart and Discovering GME

  30 mai 2011, par Multimedia Mike — Game Hacking

  I found the following screenshot buried deep in an old directory structure of mine :

  
  
  

  I tried to recall how this screenshot came to exist. Had I actually created a functional KDE frontend to Nosefart yet neglected to release it ? I think it’s more likely that I used some designer tool (possibly KDevelop) to prototype a frontend. This would have been sometime in 2000.

  However, this screenshot prompted me to revisit Nosefart.

  Nosefart Background
  Nosefart is a program that can play Nintendo Sound Format (NSF) files. NSF files are files containing components that were surgically separated from Nintendo Entertainment System (NES) ROM dumps. These components contain the music playback engines for various games. An NSF player is a stripped down emulation system that can simulate the NES6502 CPU along with the custom hardware (2 square waves, 1 triangle wave, 1 noise generator, and 1 limited digital channel).

  Nosefart was written by Matt Conte and eventually imported into a Sourceforge project, though it has not seen any development since then. The distribution contains standalone command line players for Linux and DOS, a GTK frontend for the Linux command line version, and plugins for Winamp, XMMS, and CL-Amp.

  The Sourceforge project page notes that Nosefart is also part of XBMC. Let the record show that Nosefart is also incorporated into xine (I did that in 2002, I think).

  Upgrading the API
  When I tried running the command line version of Nosefart under Linux, I hit hard against the legacy audio API : OSS. Remember that ?

  In fairly short order, I was able to upgrade the CL program to use PulseAudio. The program is not especially sophisticated. It’s a single-threaded affair which checks for a keypress, processes an audio frame, and sends the frame out to the OSS file interface. All that was needed was to rewrite open_hardware() and close_hardware() for PA and then replace the write statement in play(). The only quirk that stood out is that including <pulse/pulseaudio.h> is insufficient for programming PA’s simple API. <pulse/simple.h> must be included separately.

  For extra credit, I adapted the program to ALSA. The program uses the most simplistic audio output API possible — just keep filling a buffer and sending it out to the DAC.

  Discovering GME
  I’m not sure what to do with the the program now since, during my research to attempt to bring Nosefart up to date, I became aware of a software library named Game Music Emu, or GME. It’s a pure C++ library that can essentially play any classic video game format you can possible name. Wow. A lot can happen in 10 years when you’re not paying attention.

  It’s such a well-written library that I didn’t need any tutorial or documentation to come up to speed. Just a quick read of the main gme.h header library enabled me in short order to whip up a quick C program that could play NSF and SPC files. Path of least resistance : Client program asks library to open a hardcoded file, synthesize 10 seconds of audio, and dump it into a file ; ask the FLAC command line program to transcode raw data to .flac file ; use ffplay to verify the results.

  I might develop some other uses for this library.