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  • Contribute to translation

    13 avril 2011

    You can help us to improve the language used in the software interface to make MediaSPIP more accessible and user-friendly. You can also translate the interface into any language that allows it to spread to new linguistic communities.
    To do this, we use the translation interface of SPIP where the all the language modules of MediaSPIP are available. Just subscribe to the mailing list and request further informantion on translation.
    MediaSPIP is currently available in French and English (...)

  • 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 (...)

  • Sélection de projets utilisant MediaSPIP

    29 avril 2011, par

    Les exemples cités ci-dessous sont des éléments représentatifs d’usages spécifiques de MediaSPIP pour certains projets.
    Vous pensez avoir un site "remarquable" réalisé avec MediaSPIP ? Faites le nous savoir ici.
    Ferme MediaSPIP @ Infini
    L’Association Infini développe des activités d’accueil, de point d’accès internet, de formation, de conduite de projets innovants dans le domaine des Technologies de l’Information et de la Communication, et l’hébergement de sites. Elle joue en la matière un rôle unique (...)

Sur d’autres sites (5146)

  • How to set time_base when muxing AVI with libavformat ?

    18 mai 2012, par Anastasia

    In my application I receive from a remote server synchronized video
    (mpeg4) and audio (mp3) and mux them to avi file. The video comes
    frame-by-frame, and the audio comes in small chunks, say 200-250 ms.
    Both video frames and audio chunks have timestamps in milliseconds.

    My question is how to set audio time_base and pts correctly ?
    For video I set time_base.num = framerate, time_base.den = 1 ; and
    calculate pts as follows :

      AVRational time_base_1kHz; 
    
  time_base_1kHz.num = 1; 
    
  time_base_1kHz.den = 1000; 
    
  packet.pts = av_rescale_q(timeStamp - baseTimeStamp_, time_base_1kHz, videoStream_->time_base);

    where baseTimeStamp_ is the 1st timestamp of the stream.

    But if I try do similar calculation for audio, I don't get playable
    avi. If I always set to audio AV_NOPTS_VALUE, then avi has playable
    video, but no audio.

    So what are the correct values for audio time_base and pts's ?
    Do I set time_base and pts's for video correctly ?

  • Why does FFMPEG adds up extra bit rate to video ? [migrated]

    5 juin 2012, par user735647

    I use FFMPEG (command line Input) to convert my videos to a specific output format. The problem I am facing is when I try to pass a constant bit rate(700 kbps) to FFMPEG, the result is an output video with a different bit rate(say 1000 kbps). This phenomenon occurs invariably for all videos.Why is this happening ? I need to maintain a constant bit rate. Can anyone help me out.

    My FFMPEG version is 0.5

    The command line parameter which I am passing to FFMPEG is,

    -i {inputfile}
    
-b 700k -ab 64k
    
-vcodec libx264
    
-acodec libfaac -ac 2 -ar 44100
    
-y -s 320x240 
    
{outputfile}

    EDIT :

    I was able to force CBR with a fluctuation of 3% when I used the following parameters.

     ffmpeg -i myfile.avi
    
 -b 4000k -minrate 4000k 
    
 -maxrate 4000k -bufsize 1835k   out.m2v

    But when I used -maxrate and - minrate along with my parameter set I was not able to force CBR. My parameter set is as follows,

    -i {inputfile}
    
-b 1200k -minrate 1200k 
    
 -maxrate 1200k -bufsize 1200k 
    
-ab 64k -vcodec libx264
    
-acodec libfaac -ac 2 -ar 44100
    
-y -s 320x240 
    
{outputfile}

    Why is this happening ?

  • Make video out of pictures (no compression)

    17 avril 2014, par Hermilton

    I have 1000 png files as output from a simulation (total size of all png-files 44.2 MB), and I want to make a video where each frame is simply one png file.
    So it should be something like just concatenating the png files to one movie file.

    I already tried doing this with "ffmpeg"/"avconv" but I'm a novice in this programms, and my output videos turned out to be either way to large (700MB !) or just blurry compared to the pngs.

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