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Autres articles (24)

  • 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 (...)

  • Supporting all media types

    13 avril 2011, par

    Unlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)

Sur d’autres sites (3534)

  • FFmpeg overwrite an AVPacket

    26 janvier 2019, par Alejandro Ramírez

    Hello guys I am working with video. I wan to encrypt the I-frames of one video compressed in H.264. So I get the AVPacket from the video and compare if (AVPacket.flags & AV_PKT_FLAG_KEY) to know if the packet has an I frame, but when I try to print the AVPacket.data I don’t have any information to encrypt.
    Where can I get the information regarding to I-frame. ahead a put my code, thank you.

    #include <iostream>
    extern "C" {
    #include <libavcodec></libavcodec>avcodec.h>
    #include <libavformat></libavformat>avformat.h>
    #include <libswscale></libswscale>swscale.h>
    #include <libavutil></libavutil>avutil.h>
    }
    #define INBUF_SIZE 4096
    //#define AV_INPUT_BUFFER_PADDING_SIZE 32
    int main (int argc, char * argv[])
    {
       //av_register_all();//omit
       //revisar el número de argumentos en el video
       AVFormatContext *pFormatCtx = NULL;
       AVCodec *dec = NULL;
       AVCodecContext *pCodecCtx = NULL;
       AVStream *st = NULL;
       AVDictionary *opts = NULL;
       AVFrame *frame;
       AVPacket avpkt;
       uint8_t inbuf [INBUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
       FILE *f;
       int frame_count;
       int video_stream_index = -1;

       //av_init_packet (&amp;avpkt);

       memset (inbuf + INBUF_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE);
       if (avformat_open_input (&amp;pFormatCtx, argv[1], NULL, NULL) != 0)
           return -1;
       if (avformat_find_stream_info (pFormatCtx, NULL) &lt; 0)
           return -1;
       //video_stream_index = av_find_best_stream (pFormatCtx,AVMEDIA_TYPE_VIDEO, -1, -1, &amp;dec,0);
       video_stream_index = av_find_best_stream (pFormatCtx,AVMEDIA_TYPE_VIDEO, -1, -1, &amp;dec,0);
       if ( video_stream_index &lt; 0)
           return -1;
       std::cout &lt;&lt; "video_stream; " &lt;&lt; video_stream_index &lt;&lt; "\n";
       st = pFormatCtx -> streams [video_stream_index];
       std::cout &lt;&lt; "number of frames " &lt;&lt; st -> nb_frames &lt;&lt; "\n";
       std::cout &lt;&lt; "event_flags " &lt;&lt; st -> event_flags &lt;&lt; "\n";
       //pCodecCtx = st -> codec;//deprecated

       dec = avcodec_find_decoder (st -> codecpar -> codec_id);
       std::cout &lt;&lt; "codec_id: " &lt;&lt; st -> codecpar -> codec_id &lt;&lt; "\n";
       std::cout &lt;&lt; "AV_CODEC_ID_H264: " &lt;&lt; AV_CODEC_ID_H264 &lt;&lt; "\n";
       if (!dec)
           return -1;
       pCodecCtx = avcodec_alloc_context3 (dec);
       if (!pCodecCtx)
           return -1;
       //av_dict_set (&amp;opts, "refcounted_frames", "0", 0);
       avcodec_parameters_to_context (pCodecCtx, st -> codecpar);


       std::cout &lt;&lt; "todo bien \n";    
       if (avcodec_open2 (pCodecCtx, dec, &amp;opts) &lt; 0)
           return -1;
       /*************hasta aqui buen codigo*********************************************/
       frame = av_frame_alloc ();
       if (!frame)
           return -1;
       av_init_packet (&amp;avpkt);
       avpkt.data = NULL;
       avpkt.size = 0;
       f = fopen (argv[1], "r");
       int times = 1;
       while (av_read_frame (pFormatCtx, &amp;avpkt) >= 0){
           AVPacket oripkt = avpkt;
           if (oripkt.stream_index == video_stream_index){
               if (oripkt.flags &amp; AV_PKT_FLAG_KEY){
                   std::cout &lt;&lt; "times: " &lt;&lt; times ++ &lt;&lt; "\n";
                   std::cout &lt;&lt; "avpkt.flags: " &lt;&lt; oripkt.flags &lt;&lt; "\n";
                   std::cout &lt;&lt; "tam avpkt.data: " &lt;&lt; sizeof(oripkt.data) &lt;&lt; "\n";
                   std::cout &lt;&lt; "tam avpkt.data: " &lt;&lt; oripkt.data &lt;&lt; "\n";
                   std::cout &lt;&lt; "oripkt.size: " &lt;&lt; oripkt.size &lt;&lt; "\n";
                   std::cout &lt;&lt; "oripkt.side_date_eme: " &lt;&lt; oripkt.side_data_elems &lt;&lt; "\n";
                   if (!oripkt.data)
                       std::cout &lt;&lt; "no tengo dinero \n";
               }
           }
       }

       std::cout &lt;&lt; "Fin del programa " &lt;&lt; "\n";
    }
    </iostream>
  • Revision 106302 : - PHPDoc ; - Un warning PHP ; - Mine de rien… Ce plugin nécessite ...

    15 septembre 2017, par teddy.spip@… — Log

    - PHPDoc ;
    - Un warning PHP ;
    - Mine de rien… Ce plugin nécessite Saisies. si si : aide/verifier_fonctions.php
    - Un doublon dans code_postal.php ;
    - Toujours mettre un numéro de compatibilité dans les necessite et utilise pour ne pas faire grincher SVP ;
    - Petite correction de chaine de langue ;
    - Petit up de z.

  • Evolution #4411 (En cours) : mini-pedzouille admin_plugins IE11 (et les autres..) => SVP

    11 décembre 2019, par Yannyx Spip

    Sur les pages de admin_plugin le numéro de version est "collé" au nom du plugin
    - cela est particulièrement dérangeant sous IE11 (moins sous d’autres navigateurs)
    voir les copies d’ecrans SPIP 3.2.5 WAMP

    Solution simpliste : /svp/formulaires/inc-admin_plugin.php
    [-49] [(#VERSION)]
    [+49] [ (#VERSION)]
    [50] [ - (#ETAT)]