Recherche avancée

Médias (91)

Autres articles (63)

  • Le profil des utilisateurs

    12 avril 2011, par

    Chaque utilisateur dispose d’une page de profil lui permettant de modifier ses informations personnelle. Dans le menu de haut de page par défaut, un élément de menu est automatiquement créé à l’initialisation de MediaSPIP, visible uniquement si le visiteur est identifié sur le site.
    L’utilisateur a accès à la modification de profil depuis sa page auteur, un lien dans la navigation "Modifier votre profil" est (...)

  • Configurer la prise en compte des langues

    15 novembre 2010, par

    Accéder à la configuration et ajouter des langues prises en compte
    Afin de configurer la prise en compte de nouvelles langues, il est nécessaire de se rendre dans la partie "Administrer" du site.
    De là, dans le menu de navigation, vous pouvez accéder à une partie "Gestion des langues" permettant d’activer la prise en compte de nouvelles langues.
    Chaque nouvelle langue ajoutée reste désactivable tant qu’aucun objet n’est créé dans cette langue. Dans ce cas, elle devient grisée dans la configuration et (...)

  • XMP PHP

    13 mai 2011, par

    Dixit Wikipedia, XMP signifie :
    Extensible Metadata Platform ou XMP est un format de métadonnées basé sur XML utilisé dans les applications PDF, de photographie et de graphisme. Il a été lancé par Adobe Systems en avril 2001 en étant intégré à la version 5.0 d’Adobe Acrobat.
    Étant basé sur XML, il gère un ensemble de tags dynamiques pour l’utilisation dans le cadre du Web sémantique.
    XMP permet d’enregistrer sous forme d’un document XML des informations relatives à un fichier : titre, auteur, historique (...)

Sur d’autres sites (5201)

  • FFMPEG AVCodec : How can I create a FULL copy of a decoder ?

    21 avril 2015, par damicolo

    I’m writing a video decoder (using FFMPEG/AVCodec) for a custom implementation of an mpeg4 video stream. The peculiarity of this video stream is that it could split into many "son" streams creating many P frames based on the same parent. The video stream I’m trying to decode is actually a sort of "video tree". Something like this :

    I <--P <--P <---------------------P <-------------- P <------------ P
    
           \ <--P <--P <--P        \ <--P <--P       \ <--P <--P

    I’ve already wrote a basic decoder which works fine when I decide to follow one path, the problem is when I try to follow more than one path in the video tree. At this point I need to "fork" my decoder to follow two different video streams. the split could occur not only after a key frame, but even after a P frame, so I need to duplicate the AVCodecContext (I use avcodec_copy_context) but it seems to create new decoder from a clean status.. it seems to ignore the previous video status, so the decoded P frames are "applied" to an empty video frame.
    Probably copying the context using avcodec_copy_context is not enough... Any suggestion ? How can I duplicate the context and the complete status of the decoder ?
    Or, is there any other way to decode my stream using references ?
    Thanks !

  • How can I create a FULL copy of a decoder ?

    28 avril 2015, par damicolo

    I’m writing a video decoder (using FFMPEG/AVCodec) for a custom implementation of an mpeg4 video stream. The peculiarity of this video stream is that it could split into many "son" streams creating many P frames based on the same parent. The video stream I’m trying to decode is actually a sort of "video tree". Something like this :

    I <--P <--P <---------------------P <-------------- P <------------ P
    
           \ <--P <--P <--P        \ <--P <--P       \ <--P <--P

    I’ve already wrote a basic decoder which works fine when I decide to follow one path, the problem is when I try to follow more than one path in the video tree. At this point I need to "fork" my decoder to follow two different video streams. the split could occur not only after a key frame, but even after a P frame, so I need to duplicate the AVCodecContext (I use avcodec_copy_context) but it seems to create new decoder from a clean status.. it seems to ignore the previous video status, so the decoded P frames are "applied" to an empty video frame.
    Probably copying the context using avcodec_copy_context is not enough... Any suggestion ? How can I duplicate the context and the complete status of the decoder ?
    Or, is there any other way to decode my stream using references ?
    Thanks !

  • Installing full multimedia stack on server (ffmpeg,mp4box,sox,mplayer)

    29 avril 2015, par hdezela

    I’ve had a trusty text file with all(?) the steps I need to set up a full multimedia stack on a RHEL compatible server (CentOS, AWS Linux, etc.) for a few years now. However, sometimes some things are missing and I need to revise it. I know it is not complete so I’m asking for suggestions/modifications in order to get a good - and public - list of how to install all this stuff easily.

    Ideally, I want to be able to run through the file and end up with a system that’ll take any media file and be able to convert/encode/decode/whatever with it.

    This is what I have :

    yum install mesa-libGL-devel mesa-libGLU-devel libXi-devel libXmu-devel freeglut-devel freeglut ncurses-devel
    
cd /usr/local/src
    
mkdir /usr/local/src/tmp
    
chmod 777 /usr/local/src/tmp
    
export TMPDIR=/usr/local/src/tmp
    

    
wget http://www.tortall.net/projects/yasm/releases/yasm-1.3.0.tar.gz
    
wget http://downloads.xiph.org/releases/ogg/libogg-1.3.2.tar.gz
    
wget http://downloads.xiph.org/releases/vorbis/libvorbis-1.3.4.tar.gz
    
wget http://downloads.xiph.org/releases/theora/libtheora-1.1.1.tar.gz
    
wget ftp://ftp.videolan.org/pub/videolan/x264/snapshots/last_stable_x264.tar.bz2
    
wget http://downloads.sourceforge.net/project/opencore-amr/opencore-amr/opencore-amr-0.1.3.tar.gz
    
wget http://downloads.sourceforge.net/faac/faac-1.28.tar.gz
    
wget http://downloads.sourceforge.net/project/lame/lame/3.99/lame-3.99.5.tar.gz
    
wget http://webm.googlecode.com/files/libvpx-v1.3.0.zip
    
wget http://downloads.sourceforge.net/project/yamdi/yamdi/1.9/yamdi-1.9.tar.gz
    
wget http://rtmpdump.mplayerhq.hu/download/rtmpdump-2.3.tgz
    
git clone https://github.com/FFmpeg/FFmpeg.git
    
wget http://downloads.sourceforge.net/gpac/gpac-0.5.0.tar.gz
    
wget http://downloads.sourceforge.net/gpac/gpac_extra_libs-0.5.0.tar.gz
    
wget http://www.mplayerhq.hu/MPlayer/releases/codecs/all-20110131.tar.bz2
    
wget http://www.mplayerhq.hu/MPlayer/releases/MPlayer-1.1.tar.xz
    
wget https://bitbucket.org/acoustid/chromaprint/downloads/chromaprint-fpcalc-1.1-linux-x86_64.tar.gz
    
wget http://sourceforge.net/projects/mad/files/madplay/0.15.2b/madplay-0.15.2b.tar.gz
    
wget http://sourceforge.net/projects/mad/files/libmad/0.15.1b/libmad-0.15.1b.tar.gz
    
wget http://sourceforge.net/projects/mad/files/libid3tag/0.15.1b/libid3tag-0.15.1b.tar.gz
    
wget http://sourceforge.net/projects/sox/files/sox/14.4.1/sox-14.4.1.tar.gz
    
wget http://downloads.xiph.org/releases/ao/libao-1.2.0.tar.gz
    
wget http://downloads.sourceforge.net/twolame/twolame-0.3.13.tar.gz
    
wget http://www.mega-nerd.com/libsndfile/files/libsndfile-1.0.25.tar.gz
    
wget http://www.wavpack.com/wavpack-4.70.0.tar.bz2
    
wget http://www.linuxfromscratch.org/patches/blfs/svn/libmad-0.15.1b-fixes-1.patch
    

    
tar zxf yasm-1.3.0.tar.gz
    
tar zxf libogg-1.3.2.tar.gz
    
tar zxf libvorbis-1.3.4.tar.gz
    
tar zxf libtheora-1.1.1.tar.gz
    
tar jxf last_stable_x264.tar.bz2
    
tar zxf opencore-amr-0.1.3.tar.gz
    
tar zxf faac-1.28.tar.gz
    
tar zxf lame-3.99.5.tar.gz
    
unzip libvpx-v1.3.0.zip
    
tar xzf yamdi-1.9.tar.gz
    
tar xzf rtmpdump-2.3.tgz
    
tar zxvf gpac-0.5.0.tar.gz
    
tar zxvf gpac_extra_libs-0.5.0.tar.gz
    
tar jxf all-20110131.tar.bz2
    
tar jxf MPlayer-1.1.tar.xz
    
tar xf chromaprint-fpcalc-1.1-linux-x86_64.tar.gz
    
tar xf madplay-0.15.2b.tar.gz
    
tar xf libmad-0.15.1b.tar.gz
    
tar xf libid3tag-0.15.1b.tar.gz
    
tar xf sox-14.4.1.tar.gz
    
tar xf libao-1.2.0.tar.gz
    
tar xf twolame-0.3.13.tar.gz
    
tar xf libsndfile-1.0.25.tar.gz
    
tar jxf wavpack-4.70.0.tar.bz2
    

    
[YASM]
    
    cd /usr/local/src/yasm-1.3.0
    
    ./configure && make && make install
    
    yasm --version
    
    ldconfig
    
[LIBOGG]
    
    cd /usr/local/src/libogg-1.3.2
    
    ./configure && make clean && make && make install
    
    ls /usr/local/lib/libogg*
    
    ldconfig
    
[LIBVORBIS]
    
    cd /usr/local/src/libvorbis-1.3.4
    
    ./configure && make clean && make && make install
    
    ls /usr/local/lib/libvorbis*
    
    ldconfig
    
[LIBTHEORA]
    
    cd /usr/local/src/libtheora-1.1.1
    
    ./configure && make clean && make && make install
    
    ls /usr/local/lib/libtheora*
    
    ldconfig
    
[x264]
    
    cd /usr/local/src/x264-snapshot-[***]
    
    ./configure --enable-shared && make clean && make && make install
    
    ls /usr/local/lib/libx264*
    
    ldconfig
    
[AMR]
    
    cd /usr/local/src/opencore-amr-0.1.3
    
    ./configure && make clean && make && make install
    
    ls /usr/local/lib/libopencore*
    
    ldconfig
    
[FAAC]
    
    cd /usr/local/src/faac-1.28
    
    vi /usr/local/src/faac-1.28/common/mp4v2/mpeg4ip.h [ELIMINAR]:char *strcasestr(const char *haystack, const char *needle);
    
    ./configure && make && make install
    
    ls /usr/local/lib/libfaac*
    
    ldconfig
    
[LAME]
    
    cd /usr/local/src/lame-3.99.5
    
    ./configure && make clean && make && make install
    
    ls /usr/local/lib/libmp3lame*
    
    ldconfig
    
[GPAC+MP4BOX]
    
    cd  /sr/local/src/gpac
    
    cp -r ../gpac_extra_libs/* extra_lib/
    
    chmod +x configure
    
    ./configure
    
    make lib
    
    make apps
    
    make install-lib
    
    make install
    
    cp bin/gcc/libgpac.so /usr/lib
    
    ldconfig
    
[LIBVPX]
    
    cd /usr/local/src/libvpx-v1.3.0
    
    ./configure --enable-vp8  --enable-pic --enable-shared && make && make install
    
    ls /usr/local/lib/libvpx*
    
    ldconfig
    
[LIBRTMP]
    
    cd /usr/local/src/rtmpdump-2.3
    
    make SYS=posix
    
    make install
    
    ls /usr/local/lib/librtm*
    
    ldconfig
    
[FFMPEG]
    
    cd /usr/local/src/FFmpeg
    
    export PKG_CONFIG_PATH="${PKG_CONFIG_PATH}:/usr/local/lib/pkgconfig"
    
    ./configure  --enable-gpl --enable-version3 --enable-nonfree --enable-shared --enable-libmp3lame --enable-libx264 --enable-libfaac --enable-libvpx --enable-libvorbis --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopencore-amrnb  --enable-libtheora --enable-librtmp
    
    make clean && make && make install
    
    make tools/qt-faststart
    
    cp tools/qt-faststart /usr/local/bin/
    
    ldconfig
    
    ffmpeg
    
    qt-faststart
    
[MPLAYER]
    
    mv /usr/local/src/all-20110131 /usr/local/lib/codecs/
    
    chmod -R 755 /usr/local/lib/codecs/
    
    cd MPlayer-1-1
    
    make clean
    
    ./configure && make && make install
    
    ldconfig
    
[YAMDI]
    
    cd /usr/local/src/yamdi-1.9
    
    gcc yamdi.c -o yamdi -O2 -Wall
    
    strip yamdi
    
    cp yamdi /usr/bin/yamdi
    
    yamdi -h
    
[MEDIAINFO]
    
    rpm -ivh http://downloads.sourceforge.net/zenlib/libzen0-0.4.31-1.x86_64.CentOS_6.rpm
    
    rpm -ivh http://sourceforge.net/projects/mediainfo/files/binary/libmediainfo0/0.7.73/libmediainfo0-0.7.73-1.x86_64.CentOS_6.rpm
    
    rpm -ivh http://sourceforge.net/projects/mediainfo/files/binary/mediainfo/0.7.73/mediainfo-0.7.73-1.x86_64.CentOS_6.rpm
    
[CHROMAPRINT]
    
    cp /usr/local/src/chromaprint-fpcalc-1.1-linux-x86_64/fpcalc /usr/local/bin/fpcalc
    
[LIBAO]
    
    cd /usr/local/src/libao-1.2.0
    
    ./configure
    
    make
    
    make install
    
    ldconfig
    
[LIBSND]
    
    cd /usr/local/src/libsndfile-1.0.25
    
    ./configure
    
    make
    
    make install
    
    ldconfig
    
[TWOLAME]
    
    cd /usr/local/src/twolame-0.3.13
    
    ./configure
    
    make
    
    make install
    
    ldconfig
    
[WAVPACK]
    
    cd /usr/local/src/wavpack-4.70.0
    
    ./configure
    
    make
    
    make install
    
    ldconfig
    
[LIBMAD]
    
    cd /usr/local/src/libmad-0.15.1b
    
    patch -Np1 -i ../libmad-0.15.1b-fixes-1.patch
    
    sed "s@AM_CONFIG_HEADER@AC_CONFIG_HEADERS@g" -i configure.ac
    
    touch NEWS AUTHORS ChangeLog
    
    autoreconf -fi
    
    ./configure --enable-shared
    
    make
    
    make install
    
    ldconfig
    
[ID3]
    
    cd /usr/local/src/libid3tag-0.15.1b
    
    ./configure --enable-shared
    
    make
    
    make install
    
    ldconfig
    
[MADPLAY]
    
    cd /usr/local/src/madplay-0.15.2b
    
    ./configure --enable-shared
    
    make
    
    make install
    
    ldconfig
    
[SOX]
    
    cd /usr/local/src/sox-14.4.1
    
    ./configure
    
    make -s
    
    make install
    
    ldconfig

Navigation