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  • Des sites réalisés avec MediaSPIP

    2 mai 2011, par

    Cette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
    Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page.

  • Participer à sa traduction

    10 avril 2011

    Vous pouvez nous aider à améliorer les locutions utilisées dans le logiciel ou à traduire celui-ci dans n’importe qu’elle nouvelle langue permettant sa diffusion à de nouvelles communautés linguistiques.
    Pour ce faire, on utilise l’interface de traduction de SPIP où l’ensemble des modules de langue de MediaSPIP sont à disposition. ll vous suffit de vous inscrire sur la liste de discussion des traducteurs pour demander plus d’informations.
    Actuellement MediaSPIP n’est disponible qu’en français et (...)

  • 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 (...)

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  • vulkan_video : add utilities for H264 level/profile mapping

    30 août 2024, par Lynne
    vulkan_video : add utilities for H264 level/profile mapping
    • [DH] libavcodec/vulkan_video.c
    • [DH] libavcodec/vulkan_video.h

  • avcodec/libfdk-aacdec : set keyframe flag and profile in output frames

    17 novembre 2024, par James Almer
    avcodec/libfdk-aacdec : set keyframe flag and profile in output frames

    Don't depend on the generic code setting this.
    
This is in preparation for a following change.
    

    Signed-off-by : James Almer <jamrial@gmail.com>
    • [DH] libavcodec/libfdk-aacdec.c

  • aacenc : remove support for AAC LTP profile

    8 février, par Lynne
    aacenc : remove support for AAC LTP profile

    The LTP profile of AAC is... terrible.
    
It was an early 90's attempt at bridging the gap between speech
    
codecs and general purpose codecs. It did so by trying to exploit the fact
    
that most speech patterns are regular.
    

    Unfortunately, it went about it the same way as AAC Main, by taking
    
the previous frame's samples, modifying them through an LPC filter,
    
transforming them back using a forward MDCT, putting the output
    
coefficients back into the current frame, and using delta coding.
    
But once again, they ignored basic mathematics and MDCT leakage.
    
Thankfully, because AAC LTP is meant to operate at very low bitrates,
    
the extreme quantization results in most leakage being irrelevant.
    

    Unfortunately, the result is that the output sounds pretty much
    
terrible regardless of whether LTP is enabled or not.
    

    This was the first attempt at trying to couple speech coding into AAC.
    
No, the second attempt did not succeed either.
    
Nnnneither did the third. Or fourth.
    

    For the fifth one, they literally just jammed a speech codec into AAC
    
with USAC once they saw Opus do it.
    

    Just drop support for encoding AAC LTP. It was always experimental
    
to begin with.
    • [DH] libavcodec/Makefile
    • [DH] libavcodec/aaccoder.c
    • [DH] libavcodec/aacenc.c
    • [DH] libavcodec/aacenc.h
    • [DH] libavcodec/aacenc_ltp.c
    • [DH] libavcodec/aacenc_ltp.h
    • [DH] libavcodec/aacenctab.h

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