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Autres articles (27)

  • 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.
    All uploaded files are stored online in their original format, so you can (...)

  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

  • Installation en mode ferme

    4 février 2011, par

    Le mode ferme permet d’héberger plusieurs sites de type MediaSPIP en n’installant qu’une seule fois son noyau fonctionnel.
    C’est la méthode que nous utilisons sur cette même plateforme.
    L’utilisation en mode ferme nécessite de connaïtre un peu le mécanisme de SPIP contrairement à la version standalone qui ne nécessite pas réellement de connaissances spécifique puisque l’espace privé habituel de SPIP n’est plus utilisé.
    Dans un premier temps, vous devez avoir installé les mêmes fichiers que l’installation (...)

Sur d’autres sites (5249)

  • How can I create a FULL copy of a decoder ?

    28 avril 2015, par damicolo

    I’m writing a video decoder (using FFMPEG/AVCodec) for a custom implementation of an mpeg4 video stream. The peculiarity of this video stream is that it could split into many "son" streams creating many P frames based on the same parent. The video stream I’m trying to decode is actually a sort of "video tree". Something like this :

    I <--P <--P <---------------------P <-------------- P <------------ P
    
           \ <--P <--P <--P        \ <--P <--P       \ <--P <--P

    I’ve already wrote a basic decoder which works fine when I decide to follow one path, the problem is when I try to follow more than one path in the video tree. At this point I need to "fork" my decoder to follow two different video streams. the split could occur not only after a key frame, but even after a P frame, so I need to duplicate the AVCodecContext (I use avcodec_copy_context) but it seems to create new decoder from a clean status.. it seems to ignore the previous video status, so the decoded P frames are "applied" to an empty video frame.
    Probably copying the context using avcodec_copy_context is not enough... Any suggestion ? How can I duplicate the context and the complete status of the decoder ?
    Or, is there any other way to decode my stream using references ?
    Thanks !

  • FFMPEG AVCodec : How can I create a FULL copy of a decoder ?

    21 avril 2015, par damicolo

    I’m writing a video decoder (using FFMPEG/AVCodec) for a custom implementation of an mpeg4 video stream. The peculiarity of this video stream is that it could split into many "son" streams creating many P frames based on the same parent. The video stream I’m trying to decode is actually a sort of "video tree". Something like this :

    I <--P <--P <---------------------P <-------------- P <------------ P
    
           \ <--P <--P <--P        \ <--P <--P       \ <--P <--P

    I’ve already wrote a basic decoder which works fine when I decide to follow one path, the problem is when I try to follow more than one path in the video tree. At this point I need to "fork" my decoder to follow two different video streams. the split could occur not only after a key frame, but even after a P frame, so I need to duplicate the AVCodecContext (I use avcodec_copy_context) but it seems to create new decoder from a clean status.. it seems to ignore the previous video status, so the decoded P frames are "applied" to an empty video frame.
    Probably copying the context using avcodec_copy_context is not enough... Any suggestion ? How can I duplicate the context and the complete status of the decoder ?
    Or, is there any other way to decode my stream using references ?
    Thanks !

  • Streaming Web cam real-time buffer [Toshiba Webcam] [video input] too full or near too full

    21 avril 2015, par esprittn

    I am trying to stream my webcam with audio from microphone of laptop(OS : windows 7 ) to nginx server (Compiled with rtmp module in CentOS 6.6 final) in same local network.
    From my laptop, I execute this command in CMD :

    ffmpeg -f dshow -i video="Toshiba Webcam" -f dshow -i audio="Microphone (Périphérique High D" -vf scale=1280:720 -vcodec libx264 -r 60.97 -acodec libvo_aacenc -ac 2 -ar 44100 -ab 128 -pix_fmt yuv420p -tune zerolatency -preset ultrafast -f flv "rtmp://172.16.40.162/dash/test"

    But I got this message :
    enter image description here

    And I had about retard delay of 23 second when I open http://localhost:8080 ( I made the indx.html file of nginx with JWPlayer)

    So my questions are :

    How can I improve the ffmpeg cmd to avoid the errors of buffer too full ?

    How eliminate or reduce the latency ?

    Thanks for your help.

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