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  • MediaSPIP 0.1 Beta version

    25 avril 2011, par

    MediaSPIP 0.1 beta is the first version of MediaSPIP proclaimed as "usable".
    The zip file provided here only contains the sources of MediaSPIP in its standalone version.
    To get a working installation, you must manually install all-software dependencies on the server.
    If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...)

  • Personnaliser en ajoutant son logo, sa bannière ou son image de fond

    5 septembre 2013, par

    Certains thèmes prennent en compte trois éléments de personnalisation : l’ajout d’un logo ; l’ajout d’une bannière l’ajout d’une image de fond ;

  • HTML5 audio and video support

    13 avril 2011, par

    MediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
    The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
    For older browsers the Flowplayer flash fallback is used.
    MediaSPIP allows for media playback on major mobile platforms with the above (...)

Sur d’autres sites (8705)

  • enabling Mpeg 4 data partitioning option

    20 janvier 2014, par user3214780

    Is there any option to enable data partitioning available in MPEG-4 codec in libavcodec of FFMPEG.

    I currently used "-data_partitioning = 1" with ffmpeg commands. Is this doing data partitioning ??

  • How is decoded audio data stored in ffmpeg AVFrame ?

    23 février 2023, par necrosato

    I'm looking for clarification on how ffmpeg stores decoded audio data in frames before I start writing code to do audio mixing. AVFrame has int format and uint8_t* data[] members. If my understanding is correct, then the bytes in data should be cast to the proper type for format before working with it. So to do a simple 2x level boost if format == AV_SAMPLE_FMT_S16, I would :

    



    int16_t* audio_samples = frame->data[0];
int num_samples = frame->nb_samples * frame->channels;
for (int i = 0; i < num_samples; ++i) {
  audio_samples[i] = audio_samples[i] * 2;
}


    



    Is this the correct way of going about things ?

    


  • How to calculate sizes for AVPicture.data[x] pointers (YUV420p) when using libffmpeg

    13 août 2013, par bradenV2

    I'm trying to get Y,U,V values separately in order to pass them to openGL and map to a texture. I know these values can be found in AVPicture.data[0] (Y) and AVPicture.data[1] (U) and AVPicture.data[2] (V)

    avcodec_decode_video2(ctx, frame, &frameFinished, packet_data->packet);
    
AVPicture _avPicture;
    
picSize = avpicture_get_size(ctx->pix_fmt, ctx->width, ctx->height);
    
avpicture_alloc(&_avPicture, ctx->pix_fmt,ctx->width, ctx->height );
    
avpicture_fill(&_avPicture, packet_data->packet, ctx->pix_fmt,ctx->width,ctx->height);

    ^^ That's working fine.
    The issue I run into is passing the Y,U,V values back to Java via JNI. I have to know the size of the data the AVPicture.data[x] pointers point to. I've tried AVPicture.linesize to no avail, as well as :

               for (y = 0; y < ctx->height; y++){
    
                for (x = 0; x < ctx->width; x++){
    
                    yDataSize++;
    
                }
    
            }
    
            /* Cb and Cr */
    
            for (y = 0; y < ctx->height / 2; y++) {
    
                for (x = 0; x < ctx->width / 2; x++) {
    
                    uDataSize++;
    
                    vDataSize++;
    
                }
    
            }

    I'm really stuck, thanks !

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