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  • MediaSPIP 0.1 Beta version

    25 avril 2011, par

    MediaSPIP 0.1 beta is the first version of MediaSPIP proclaimed as "usable".
    The zip file provided here only contains the sources of MediaSPIP in its standalone version.
    To get a working installation, you must manually install all-software dependencies on the server.
    If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...)

  • 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 (...)

  • ANNEXE : Les plugins utilisés spécifiquement pour la ferme

    5 mars 2010, par

    Le site central/maître de la ferme a besoin d’utiliser plusieurs plugins supplémentaires vis à vis des canaux pour son bon fonctionnement. le plugin Gestion de la mutualisation ; le plugin inscription3 pour gérer les inscriptions et les demandes de création d’instance de mutualisation dès l’inscription des utilisateurs ; le plugin verifier qui fournit une API de vérification des champs (utilisé par inscription3) ; le plugin champs extras v2 nécessité par inscription3 (...)

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  • lavf/dashenc : Write media trailers when DASH trailer is written.

    29 novembre 2018, par Andrey Semashev
    lavf/dashenc : Write media trailers when DASH trailer is written.

    This commit ensures that all (potentially, long) filesystem activity is
    
performed when the user calls av_write_trailer on the DASH libavformat
    
context, not when freeing the context. Also, this defers media segment
    
deletion until after the media trailers are written.
    • [DH] libavformat/dashenc.c

  • lavf/dashenc : Write media trailers when DASH trailer is written.

    3 décembre 2018, par Andrey Semashev
    lavf/dashenc : Write media trailers when DASH trailer is written.

    This commit ensures that all (potentially, long) filesystem activity is
    
performed when the user calls av_write_trailer on the DASH libavformat
    
context, not when freeing the context. Also, this defers media segment
    
deletion until after the media trailers are written.
    • [DH] libavformat/dashenc.c

  • Why is one ffmpeg webm dash stream much larger than the others ?

    5 janvier 2017, par ranvel

    Over the summer, I worked on putting together a script which took a x264 video/mp3 stream and broke it up into the different streams so that it would work via MSE-DASH. (Based heavily on the instructions on the webmproject.org website) Those same scripts have ceased to work, turning a 6GB video into several 25 Gb videos. I kept up with updates of ffmpeg and so I don’t know when it stopped working, but I am guessing it was due to the way that their DASH Webm implementation was updated.

    I found new method which works better, but still has a major problem with one stream. I was hoping someone could explain how this encoding works so that I could understand the underlying cause.

    #!/bin/bash
    
COMMON_OPTS="-map 0:0 -an -threads 11 -cpu-used 4 -cmp chroma"
    
WEBM_OPTS="-f webm -c:v vp9 -keyint_min 50 -g 50 -dash 1"
    

    
ffmpeg -i $1 -vn -acodec libvorbis -ab 128k audio.webm &
    
ffmpeg -i $1 $COMMON_OPTS $WEBM_OPTS -b:v 500k -vf scale=1280:720 -y vid-500k.webm &
    
ffmpeg -i $1 $COMMON_OPTS $WEBM_OPTS -b:v 700k -vf scale=1280:720 -y vid-700k.webm & 
    
ffmpeg -i $1 $COMMON_OPTS $WEBM_OPTS -b:v 1000k -vf scale=1280:720 -y vid-1000k.webm &
    
ffmpeg -i $1 $COMMON_OPTS $WEBM_OPTS -b:v 1500k -vf scale=1280:720 -y vid-1500k.webm  

    The transcode is not yet complete, but you can see where this is headed :

    -rw-r--r--  1 user  staff    87M Jan  4 23:27 audio.webm
    
-rw-r--r--  1 user  staff    27M Jan  4 23:42 vid-1000k.webm
    
-rw-r--r--  1 user  staff   285M Jan  4 23:42 vid-1500k.webm
    
-rw-r--r--  1 user  staff    15M Jan  4 23:42 vid-500k.webm
    
-rw-r--r--  1 user  staff    20M Jan  4 23:42 vid-700k.webm

    The 1500k variant is disproportionately larger than the other streams.

    The other problem is that when I use a shorter video, lets say eight or nine minutes, the above configuration runs as expected and everything is perfect. I don’t know where the limit for this is since each test costs a lot of processing power and time, but if it’s less than ten minutes, it works and if its longer than an hour, it produces massive files.

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