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  • Contribute to documentation

    13 avril 2011

    Documentation is vital to the development of improved technical capabilities.
    MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
    To contribute, register to the project users’ mailing (...)

  • D’autres logiciels intéressants

    12 avril 2011, par

    On ne revendique pas d’être les seuls à faire ce que l’on fait ... et on ne revendique surtout pas d’être les meilleurs non plus ... Ce que l’on fait, on essaie juste de le faire bien, et de mieux en mieux...
    La liste suivante correspond à des logiciels qui tendent peu ou prou à faire comme MediaSPIP ou que MediaSPIP tente peu ou prou à faire pareil, peu importe ...
    On ne les connais pas, on ne les a pas essayé, mais vous pouvez peut être y jeter un coup d’oeil.
    Videopress
    Site Internet : (...)

  • Installation en mode ferme

    4 février 2011, par

    Le mode ferme permet d’héberger plusieurs sites de type MediaSPIP en n’installant qu’une seule fois son noyau fonctionnel.
    C’est la méthode que nous utilisons sur cette même plateforme.
    L’utilisation en mode ferme nécessite de connaïtre un peu le mécanisme de SPIP contrairement à la version standalone qui ne nécessite pas réellement de connaissances spécifique puisque l’espace privé habituel de SPIP n’est plus utilisé.
    Dans un premier temps, vous devez avoir installé les mêmes fichiers que l’installation (...)

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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

  • FFMPEG - VP9 - Fail to create DASH manifest file

    18 mars 2019, par Lev Bein

    Can’t create manifest.mpd file with FFMPEG.

    It writes :

    Stream mapping:
    
Stream #0:0 -> #0:0 (copy)
    
Stream #1:0 -> #0:1 (copy)
    
Could not write header for output file #0 (incorrect codec parameters ?): Invalid data found when processing input

    My code to generate manifest is :

    ffmpeg \
    
    -f webm_dash_manifest -live 1 -i video720.hdr \
    
    -f webm_dash_manifest -live 1 -i audio128.hdr \
    
    -map 0 -map 1 -c copy \
    
    -f webm_dash_manifest -y -live 1 -adaptation_sets "id=0,streams=0 id=1,streams=1" \
    
        -chunk_start_index 1 -chunk_duration_ms 2000 -time_shift_buffer_depth 7200 -minimum_update_period 7200 manifest.mpd

  • Create thumbnail from a video directory using ffmpeg

    21 juillet 2017, par Shimon Wiener

    I have a project that requires me to produce a thumbnail from 2000 videos, i researched for a tool on the net and found that ffmpeg can do it, however i could not find a sample that will demonstrate how to work on a directory of videos and run on it do create thumbnail for all the videos, can any one point to a good sample
    Thanks Shimon

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