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Autres articles (50)
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Keeping control of your media in your hands
13 avril 2011, parThe vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...) -
Submit bugs and patches
13 avril 2011Unfortunately a software is never perfect.
If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
You may also (...) -
Creating farms of unique websites
13 avril 2011, parMediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)
Sur d’autres sites (6129)
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Ffmpeg/lavfi Is it possible to fade out an image overlay that was loaded with a movie= filter not a -i parameter
26 avril 2022, par BaxterI've tried something like :


movie='overlaylogo.png',fade=out:st=5:d=1[logo],[in][logo]overlay='0:0'[out]


But it seems to stick on 100% opacity, adding in a
loop=loop-1andfps=24filter after themovie=load seem to have little effect, is there some step required to convert an image into a video for fade to apply over ?

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How can I create a FULL copy of a decoder ?
28 avril 2015, par damicoloI’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 <--PI’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 usingavcodec_copy_contextis 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 hdezelaI’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
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