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  • Les autorisations surchargées par les plugins

    27 avril 2010, par

    Mediaspip core
    autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs

  • HTML5 audio and video support

    13 avril 2011, par

    MediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
    The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
    For older browsers the Flowplayer flash fallback is used.
    MediaSPIP allows for media playback on major mobile platforms with the above (...)

  • Librairies et binaires spécifiques au traitement vidéo et sonore

    31 janvier 2010, par

    Les logiciels et librairies suivantes sont utilisées par SPIPmotion d’une manière ou d’une autre.
    Binaires obligatoires FFMpeg : encodeur principal, permet de transcoder presque tous les types de fichiers vidéo et sonores dans les formats lisibles sur Internet. CF ce tutoriel pour son installation ; Oggz-tools : outils d’inspection de fichiers ogg ; Mediainfo : récupération d’informations depuis la plupart des formats vidéos et sonores ;
    Binaires complémentaires et facultatifs flvtool2 : (...)

Sur d’autres sites (9268)

  • Fast Video Compression on Android

    7 avril 2017, par leap of faith

    I want to upload video files to server and compress before uploading. I’m using ffmpeg libx264. I have seen viber can upload 30 second video file of size 78MB within a minute [reduce it’s down to 2.3MB]. I want to know how do they do it so fast ?

    What I have tried so far -

    FFMPEG version :  n2.4.2 
    
Built with gcc 4.8
    

    
Build Configuraiton : --target-os=linux --cross-prefix=/home/sb/Source-Code/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/sb/Source-Code/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/sb/Source-Code/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/sb/Source-Code/ffmpeg-android/build/armeabi-v7a-neon --extra-cflags='-I/home/sb/Source-Code/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -mfpu=neon' --extra-ldflags='-L/home/sb/Source-Code/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=

    Command :

    ffmpeg -y -i /storage/emulated/0/main.mp4 -s 480x320 -r 20 -c:v libx264 -preset ultrafast -c:a copy -me_method zero -tune fastdecode -tune zerolatency -strict -2 -b:v 1000k -pix_fmt yuv420p /storage/emulated/0/output.mp4

    The result so far is, a 30second 78MB file gets compressed to 4.3MB which takes around 1min 28seconds. Here is the console dump - http://pastebin.com/rn81acGx . I mainly want to reduce the time it takes to compress. How can I achieve this ?

    Thanks in advance.

  • avcodec/atrac3 : allow 6 channels (non-joint stereo)

    19 janvier 2017, par bnnm
    avcodec/atrac3 : allow 6 channels (non-joint stereo)

    Raises max channels to 6 (for non joint-stereo only),
    
there is no difference decoding 1 or N discrete channels.
    
Fixes trac issue #5840
    

    Signed-off-by : bnnm <bananaman255@gmail.com>
    • [DH] libavcodec/atrac3.c

  • What CRF matches with a JPEG compression rate

    21 janvier 2017, par Xlsx

    I have a very basic program that I wrote in python that takes a video from a webcam and saves it to an mp4 file. Each frame is saved as a jpeg file, and then I use ffmpeg to merge all the frames together. There are two different compression options - the JPEG compression quality, and the mp4 CRF. Which CRF should I use relative to the JPEG compression quality so that the mp4 file is the smallest file size it can be, while not losing data from the already lossy jpeg and not adding extra data to the mp4 ?

    For example, I save my JPEGs with a quality of 30
    When I use ffmpeg, I set the -crf parameter to 38
    When I look at the final mp4 file, I have lost quality from the JPEGs

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