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  • Les formats acceptés

    28 janvier 2010, par

    Les commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
    ffmpeg -codecs ffmpeg -formats
    Les format videos acceptés en entrée
    Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
    Les formats vidéos de sortie possibles
    Dans un premier temps on (...)

  • 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 (...)

  • Contribute to documentation

    13 avril 2011

    Documentation is vital to the development of improved technical capabilities.
    MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
    To contribute, register to the project users’ mailing (...)

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  • FFMPEG : Is defining a context for a codec compulsary ?

    28 novembre 2013, par sam

    I'm having a a decoder code. I'm trying to integrate it into ffmpeg framework.

    I'm referring to the HOW TO given here : http://wiki.multimedia.cx/index.php?title=FFmpeg_codec_howto

    According to that article i need to define a structure in my decoder_name.c file.

    The example structure is shown below :

    AVCodec sample_decoder =
    
{
    
    .name           = "sample",
    
    .type           = AVCODEC_TYPE_VIDEO,
    
    .id             = AVCODEC_ID_SAMPLE,
    
   // .priv_data_size = sizeof(COOKContext),
    
    .init           = sample_decode_init,
    
    .close          = sample_decode_close,
    
    .decode         = sample_decode_frame,
    
};

    Where,

    .name -> specifies the short name of my decoder.
    

    
.type -> is used to specify that it is a video decoder.
    

    
.id -> is an unique id that i'm assigning to my video decoder.
    

    
.init -> is a function pointer to the function in my decoder code that performs decoder related initializations
    

    
.decode -> is a function pointer to the function in my decoder code that decodes a single frame, given the input data (elementary stream).
    

    
.close -> is a function pointer to the function in my decoder that frees all allocated memory i.e. the memory allocated in init.

    However, my doubt is according to the above mentioned article, there is another field called .priv_data_size which hold the size of some context.

    Is it compulsory to have this field .priv_data_size because according to the above article, i need not define all the parameters of the structure AVCodec. Further i do not possess any such context for my decoder.

    However, when i go through the code of other available decoders in libavcodec of ffmpeg, i find that every decoder has defined this. Will my decoder work if i do not specify this ? I'm unable to proceed because of this. please provide some guidance regrading the same.

    —Thanks in advance.

  • Revision 99981 : Sur Opera 40 sous Windows 10, ça provoquait un « Uncaught ReferenceError : ...

    20 octobre 2016, par real3t@… — Log

    Sur Opera 40 sous Windows 10, ça provoquait un « Uncaught ReferenceError ? : tableau_sites is not defined » qui rendait les boutons calculer inutiles.

  • Revision 99981 : Sur Opera 40 sous Windows 10, ça provoquait un « Uncaught ReferenceError : ...

    20 octobre 2016, par real3t@… — Log

    Sur Opera 40 sous Windows 10, ça provoquait un « Uncaught ReferenceError ? : tableau_sites is not defined » qui rendait les boutons calculer inutiles.

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