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  • 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

  • How to use ffmpeg to extract WAVE_FORMAT_GSM610 file to WAVE_FORMAT_PCM file

    26 juillet 2017, par xuejianbest

    I have a compressed audio file that is WAVE_FORMAT_GSM610 format.

    Now I want to open it with python wave module. But wave module only support WAVE_FORMAT_PCM file.

    I setup ffmpeg tools. What command can I use to complete this conversion ?

    Or Is there good way to complete the task ?

    Thinks.

  • How i can slice audio file with using node.js

    11 février 2018, par Maxim Cherevatov

    tell me please how i can slice audio file with using node.js ? Now i read the documentation for ffmpeg module, but don’t understand how to slice audio file with using this module.
    I found this code, but it gives an error error : NaN

    ffmpeg('music/ant.mp3')
    
    .setStartTime('00:00:03')
    
    .setDuration('10')
    
    .output('music/ant.mp3')
    
    .on('end', function(err) {
    
        if(!err)
    
        {
    
            console.log('conversion Done');
    
        }
    
    })
    
    .on('error', function(err){
    
        console.log('error: ', +err);
    
    }).run();

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