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Autres articles (40)

  • Des sites réalisés avec MediaSPIP

    2 mai 2011, par

    Cette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
    Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page.

  • Ajouter notes et légendes aux images

    7 février 2011, par

    Pour pouvoir ajouter notes et légendes aux images, la première étape est d’installer le plugin "Légendes".
    Une fois le plugin activé, vous pouvez le configurer dans l’espace de configuration afin de modifier les droits de création / modification et de suppression des notes. Par défaut seuls les administrateurs du site peuvent ajouter des notes aux images.
    Modification lors de l’ajout d’un média
    Lors de l’ajout d’un média de type "image" un nouveau bouton apparait au dessus de la prévisualisation (...)

  • Support audio et vidéo HTML5

    10 avril 2011

    MediaSPIP utilise les balises HTML5 video et audio pour la lecture de documents multimedia en profitant des dernières innovations du W3C supportées par les navigateurs modernes.
    Pour les navigateurs plus anciens, le lecteur flash Flowplayer est utilisé.
    Le lecteur HTML5 utilisé a été spécifiquement créé pour MediaSPIP : il est complètement modifiable graphiquement pour correspondre à un thème choisi.
    Ces technologies permettent de distribuer vidéo et son à la fois sur des ordinateurs conventionnels (...)

Sur d’autres sites (3486)

  • fftools/ffmpeg : add thread-aware transcode scheduling infrastructure

    18 mai 2023, par Anton Khirnov
    fftools/ffmpeg : add thread-aware transcode scheduling infrastructure
    

    See the comment block at the top of fftools/ffmpeg_sched.h for more
    details on what this scheduler is for.

    This commit adds the scheduling code itself, along with minimal
    integration with the rest of the program :
    * allocating and freeing the scheduler
    * passing it throughout the call stack in order to register the
    individual components (demuxers/decoders/filtergraphs/encoders/muxers)
    with the scheduler

    The scheduler is not actually used as of this commit, so it should not
    result in any change in behavior. That will change in future commits.

    • [DH] fftools/Makefile
    • [DH] fftools/ffmpeg.c
    • [DH] fftools/ffmpeg.h
    • [DH] fftools/ffmpeg_dec.c
    • [DH] fftools/ffmpeg_demux.c
    • [DH] fftools/ffmpeg_enc.c
    • [DH] fftools/ffmpeg_filter.c
    • [DH] fftools/ffmpeg_mux.c
    • [DH] fftools/ffmpeg_mux.h
    • [DH] fftools/ffmpeg_mux_init.c
    • [DH] fftools/ffmpeg_opt.c
    • [DH] fftools/ffmpeg_sched.c
    • [DH] fftools/ffmpeg_sched.h
  • OpenCV VideoWriter will not open

    21 février 2015, par ChrisC

    I’m having trouble instantiating and opening an OpenCV VideoWriter for recording video on a Raspberry Pi (Raspbian Weezy).

    My project is written in C++, but I’ve written a minimal Python program that demonstrates the problem.

    https://gist.github.com/chriscollins/11ff2f43852e1c93dae8

    Both my C++ code and the Python code above run without problem on my Windows machine. Sometimes the writer does not open, but that’s to be expected - I don’t have all of the listed codecs installed (the list of codecs comes from the Open CV source), but a good number of them work correctly. However, on a Raspberry Pi, both the C++ code and the Python code fail with the VideoWriter never being opened. In the above Python code, writer.isOpened() returns false for every single codec, when run on a Raspberry Pi.

    I’ve chowned the destination directory to the user I’m running the Python script as, and chmodded it to 777 so I don’t believe that it is a permissions problem. I think it may be connected with how I’ve installed OpenCV or some of its dependencies, but I’m not sure how to rectify it.

    The install process I’ve used is as follows :

    1. Update firmware/packages via rpi-update, apt-get update and apt-get upgrade.

    2. Install the following dependencies via apt-get :

      libjpeg8
      libjpeg8-dev
      libjpeg8-dbg
      libjpeg-progs
      ffmpeg
      libavcodec-dev
      libavcodec53
      libavformat53
      libavformat-dev
      libgstreamer0.10-0-dbg
      libgstreamer0.10-0
      libgstreamer0.10-dev
      libxine1-ffmpeg
      libxine-dev
      libxine1-bin
      libunicap2
      libunicap2-dev
      swig
      libv4l-0
      libv4l-dev
      python-numpy
      libpython2.6
      python-dev
      python2.6-dev
      libgtk2.0-dev
    3. Download and unzip http://sourceforge.net/projects/opencvlibrary/files/opencv-unix/2.4.9/opencv-2.4.9.zip to /root/opencv-2.4.9.

    4. cd /root/opencv-2.4.9 and run cmake -DCMAKE_BUILD_TYPE=RELEASE -DCMAKE_INSTALL_PREFIX=/usr/local -DBUILD_PERF_TESTS=OFF -DBUILD_opencv_gpu=OFF -DBUILD_opencv_ocl=OFF. Output of cmake is available at https://gist.github.com/chriscollins/d8060e03a6acd6d4336c

    5. make and make install from the same directory.

    Various other OpenCV functionality works correctly on the Raspberry Pi (in C++ or in Python) - e.g. viewing a webcam via VideoCapture, but I can’t get the VideoWriter to work. I’m tempted to try installing FFMPEG from source instead of via apt-get, but as make takes 5+ hours to run on a Raspberry Pi, I was hoping I’d find the answer here, rather than proceeding with a trial and error approach !

    Any advice on how to solve (or debug) this is appreciated.

    EDIT : Added output of cmake command (https://gist.github.com/chriscollins/d8060e03a6acd6d4336c)

  • How to embed an MP4 inside a PDF ?

    19 août 2020, par malat

    I am a happy user of img2pdf. This tool does the minimal amount of work to put a series of JPEG 2000/JPEG/PNG images into a PDF "enveloppe". However I am now faced with a new challenge : embed a MP4 file into a PDF "enveloppe".

    


    I see that commercial tool can do it, as seen at :

    


    


    Here is one such sample PDF file (no Flash required on windows in this sample) :

    


    


    It seems to have been introduced in ISO 32000-1 (PDF 1.7 Extension Level 5)

    


    I am looking for a solution which will use the Rich Media annotation inside the PDF stream.

    


    There are dozen of duplicated questions on superuser/stackoverflow, which all pretty much refer to imagemagick/convert command line tool. But in my case, convert expand the images into a multi-page PDF (which is not my desired behavior) :

    


    $ convert input.mp4 output.pdf
$ pdfinfo output.pdf 
Title:          out
Producer:       https://imagemagick.org
CreationDate:   Wed Aug 19 15:38:01 2020 CEST
ModDate:        Wed Aug 19 15:38:01 2020 CEST
Tagged:         no
UserProperties: no
Suspects:       no
Form:           none
JavaScript:     no
Pages:          1601
Encrypted:      no
Page size:      352 x 288 pts
Page rot:       0
File size:      534407296 bytes
Optimized:      no
PDF version:    1.3


    


    with :

    


    $ convert --version
Version: ImageMagick 6.9.10-23 Q16 x86_64 20190101 https://imagemagick.org
Copyright: © 1999-2019 ImageMagick Studio LLC
License: https://imagemagick.org/script/license.php
Features: Cipher DPC Modules OpenMP 
Delegates (built-in): bzlib djvu fftw fontconfig freetype jbig jng jpeg lcms lqr ltdl lzma openexr pangocairo png tiff webp wmf x xml zlib


    


    and

    


    $ file input.mp4 
input.mp4: ISO Media, MP4 Base Media v1 [IS0 14496-12:2003]
$ ffprobe -v quiet -print_format json  -show_streams input.mp4 | grep codec_long_name
            "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",