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  • Les tâches Cron régulières de la ferme

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    La gestion de la ferme passe par l’exécution à intervalle régulier de plusieurs tâches répétitives dites Cron.
    Le super Cron (gestion_mutu_super_cron)
    Cette tâche, planifiée chaque minute, a pour simple effet d’appeler le Cron de l’ensemble des instances de la mutualisation régulièrement. Couplée avec un Cron système sur le site central de la mutualisation, cela permet de simplement générer des visites régulières sur les différents sites et éviter que les tâches des sites peu visités soient trop (...)

  • Encoding and processing into web-friendly formats

    13 avril 2011, par

    MediaSPIP automatically converts uploaded files to internet-compatible formats.
    Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
    Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
    Where possible, text is analyzed in order to retrieve the data needed for search engine detection, and then exported as a series of image files.
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  • Formulaire personnalisable

    21 juin 2013, par

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    Dans le cas d’un document de type média, les champs proposés par défaut sont : Texte Activer/Désactiver le forum ( on peut désactiver l’invite au commentaire pour chaque article ) Licence Ajout/suppression d’auteurs Tags
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Sur d’autres sites (7873)

  • Why do the results of my "ffmpeg -ss -to" split have audio but no video ?

    10 avril 2018, par BenKnght

    I am trying to split clips into short intervals (that I am reading in from a csv) using ffmpeg. The commands that I’m using look like this :

    ffmpeg -i filename.mp4 -ss 00:00:00.030000 -to 00:00:02.030000   
    
-pix_fmt yuv420p -c copy new_filename.mp4

    This successfully splits the parent mp4 into many smaller mp4s, but the smaller files lose some or all of their video. Most of them end up being just audio. Some have video - but only for about half of the clip (the rest is black). The audio is always there. Any ideas why this might be happening ?

    A couple notes : I’m using ffmpeg 3.0.2. Also, I am creating this command as a Python list and running it with the following call

    subprocess.run(cmd, stderr=subprocess.STDOUT)

  • Concatenate chunk containg headers to another chunk in h264

    18 novembre 2014, par Ortixx

    I’m trying to extract thumbnails from a torrent stream by downloading the first couple of chunks to get the headers, another set of chunks from the middle and then concat them to have a single video file.

    For this I’m using nodejs but I’m having trouble with the concatenation part. Obviously the headers include the length of the video so if I simply concat another chunk to the end of the headers chunk, it won’t work.

    In other words, I have 2 chunks of a video file : The first one contains the headers and some material and the other one is fully composed of a video stream. I want to combine the two to form a single video file
    So my question is how can I make this work properly if at all ?

  • Static ffmpeg library windows

    29 novembre 2022, par peter

    Im trying to use the ffmpeg libraries (libavutil, libswscale, ...) in a bigger project by statically linking them, im not interested in the binaries. Now the issue comes down to getting them statically built. I tried searching for pre-compiled builds but without success.

    


    Following the docs, i compiled them on wsl2 for win64 with

    


    ./configure --arch=x86_64 --target-os=mingw32 --cross-prefix=i686-w64-mingw32- --disable-shared --enable-static
make


    


    After that i copied the libavformat/libavformat.a as libavformat.lib (which should be fine since they are cross-compiled ar archives ?) into my project and linked them with CMake.

    


    When compiling smth like

    


    AVFormatContext* pFormatContext = avformat_alloc_context();


    


    i get a linker error saying

    


    lld-link : error : undefined symbol: avformat_alloc_context


    


    When looking at the libs with dumpbin -linkermember libavformat.lib, i can see

    


    >dumpbin -linkermember libavformat.lib
...
  135CD92 _avformat_alloc_context
...


    


    notice the underscore.

    


    Can i not link the cross-compiled *.a files directly into a windows executable ?

    


    Honestly at this point any ideas are welcome.

    


    Thanks

    


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