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  • Des sites réalisés avec MediaSPIP

    2 mai 2011, par

    Cette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
    Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page.

  • Ajout d’utilisateurs manuellement par un administrateur

    12 avril 2011, par

    L’administrateur d’un canal peut à tout moment ajouter un ou plusieurs autres utilisateurs depuis l’espace de configuration du site en choisissant le sous-menu "Gestion des utilisateurs".
    Sur cette page il est possible de :
    1. décider de l’inscription des utilisateurs via deux options : Accepter l’inscription de visiteurs du site public Refuser l’inscription des visiteurs
    2. d’ajouter ou modifier/supprimer un utilisateur
    Dans le second formulaire présent un administrateur peut ajouter, (...)

  • Automated installation script of MediaSPIP

    25 avril 2011, par

    To overcome the difficulties mainly due to the installation of server side software dependencies, an "all-in-one" installation script written in bash was created to facilitate this step on a server with a compatible Linux distribution.
    You must have access to your server via SSH and a root account to use it, which will install the dependencies. Contact your provider if you do not have that.
    The documentation of the use of this installation script is available here.
    The code of this (...)

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  • ffmpeg Sound going out of sync with -concat or -ss

    6 août 2012, par Jared Glass

    I have a tool that spits out video from a 3D application and then concats the individual videos to make a sequence. But the sound seems to go out of sync in the sequence (the inividual files are fine) and it stutters in VLC and Quicktime. Windows media player seems to handle it bes to my supprise, yet it still goes out of sync. I have two senarios, one works and one doesn't but i need both working :

    Working :
    get already created out movs...

    convert to avi :
    os.system( ffmpeg + " -i C:\clip.mov -sameq -r 24 -y C:\clip.avi")

    concat to avi sequence :
    os.system( ffmpeg + ''' -i concat: C:\clip.avi|C:\clip1.avi|C:\clip2.avi -sameq -r 24 -y C:\sequence.avi''' )

    convert sequence to mov :
    os.system( ffmpeg + " -i C:\sequence.avi -sameq -r 24 -y C:\sequence.mov")

    Not Working :
    create individual avi's from 3D program...

    cut down to correct length :
    os.system(ffmpeg + " -i C:\clip.avi -sameq -r 24 -ss " + startTime + " -vframes " + totalFrames + " -y C:\clip.avi" )

    concat to avi sequence :
    os.system( ffmpeg + ''' -i concat: C:\clip.avi|C:\clip1.avi|C:\clip2.avi -sameq -r 24 -y C:\sequence.avi''' )

    convert sequence to mov :
    os.system( ffmpeg + " -i C:\sequence.avi -sameq -r 24 -y C:\sequence.mov")

    convert individual avi's to mov :
    os.system( ffmpeg + " -i C:\clip.avi-sameq -r 24 -y C:\clip.mov")

    Please let me know where I've gone wrong ?

  • Faster frame extraction than ffmpeg

    23 janvier 2013, par Ben Ford

    I have a video analytics program that processes assorted frames from a video. (Several hours long)
    The video is likely going to be an MP4 but may be other formats going forwards.

    At the moment, I have a C# wrapper around an ffmpeg call to extract an individual frame at the requested time. (I'm using the ffmpeg.exe binary. Not the libraries directly)
    At the moment, this all works. But it's slow. Very slow.

    I've found ways to improve the speed by storing the extracted frames in a ramdisk while they're being processed. Changing the stored image format etc...

    I just wanted to check if anyone could think of any way to pull individual frames out. At split-second accuracy.
    I know this is probably possible with DShow etc... I went straight to FFMPEG as I've used it before. But if DShow is likely to be faster I'll gladly change !

  • How to process single segment from fragmented mp4 container ?

    14 septembre 2020, par user14258924

    I have fragmented mp4 that I stream. First the mp4 header and then individual segments that are each one GOP. It is h264 and aac encoded video that I am getting from RTMP server.

    


    I would like to process these individual segments with ffmpeg(I doubt there are other tools available). Either adjust resolution or bitrate or even transcode to vp8/9 or avi1 if needed.

    


    But it seems that ffmpeg cannot handle this because the segment has no header. So I wodner if there is a flag or set of flags for ffmpeg to be able to process these segments without the header ? I could possibly just take the raw h264 and aac packets from the RTMP and not pack it into MP4 container beforehand, if that helps - would ffmpeg be able to process these ?

    


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