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    Puis-je poster des contenus à partir d’une tablette Ipad ?
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  • 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 (...)

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  • ffmpeg how to save decoded audio data to pcm

    21 avril 2015, par Jason

    I have succeed decode audio data from a mp4 using avcodec_decode_audio4， I want to save the decoded frames,so I tried below

    if (got_frame) {
    
  int size;
    
  uint8_t *data;
    
  int ref = 0;
    
  ret = swr_convert(swr, &data, frame->nb_samples, (const uint8_t **)frame->extended_data, frame->nb_samples);
    
  //fwrite(data, 1, frame->nb_samples, fp_audio);
    
  ref++;
    
  int szie = av_samples_get_buffer_size(NULL, 2, 1024, AV_SAMPLE_FMT_FLTP, 1);
    

    
  for (int i = 0; i < frame->linesize[0]/4; i++)
    
  {
    
    fwrite(frame->data[0] + 4*i, 1, 4, fp_audio);
    
    fwrite(frame->data[1] + 4*i, 1, 4, fp_audio);
    
    ref++;
    
  }
    

    

    

    
  av_frame_unref(frame);
    
}

    but the pcm sounds strange, I also tried directed write as follows

    fwrite(frame->data[0], 1, frame->linesize[0], fp_audio);

    or :

    fwrite(frame->data[0], 1, frame->linesize[0], fp_audio);
    
fwrite(frame->data[1], 1, frame->linesize[0], fp_audio);

    I know that the decoded pcm is AV_SAMPLE_FMT_FLTP
    any help would be appreciated

  • which video format is bessed for flat graphical animations

    26 avril 2020, par Zarc Rowden

    If i were to create an mp4 out of an svg animation, much of the color data in the output is the same, in PNG compression you can significantly reduce file size by reducing color. What I love about PNG is that the images always have a beautiful flat color / consistent look to them as opposed to jpegs which look very messy after antialiasing etc. (in the case of graphics to clarify). My feeling about .mp4 is that the compression technique results in frames that look "messy" like jpegs do when representing flat graphics or text. Is there a better codec out there ? Is this what webm does well ?
Thanks in advance for the input !

    


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