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Autres articles (72)

  • 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 (...)

  • Dépôt de média et thèmes par FTP

    31 mai 2013, par

    L’outil MédiaSPIP traite aussi les média transférés par la voie FTP. Si vous préférez déposer par cette voie, récupérez les identifiants d’accès vers votre site MédiaSPIP et utilisez votre client FTP favori.
    Vous trouverez dès le départ les dossiers suivants dans votre espace FTP : config/ : dossier de configuration du site IMG/ : dossier des média déjà traités et en ligne sur le site local/ : répertoire cache du site web themes/ : les thèmes ou les feuilles de style personnalisées tmp/ : dossier de travail (...)

  • Publier sur MédiaSpip

    13 juin 2013

    Puis-je poster des contenus à partir d’une tablette Ipad ?
    Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir

Sur d’autres sites (11164)

  • Revision 4944 : oups meilleure image de zoom

    7 février 2011, par kent1 — Log

    oups meilleure image de zoom

  • Revision 4944 : oups meilleure image de zoom

    7 février 2011, par kent1 — Log

    oups meilleure image de zoom

  • lavc : Implement Dolby Vision RPU parsing

    3 janvier 2022, par Niklas Haas
    lavc : Implement Dolby Vision RPU parsing

    Based on a mixture of guesswork, partial documentation in patents, and
    
reverse engineering of real-world samples. Confirmed working for all the
    
samples I've thrown at it.
    

    Contains some annoying machinery to persist these values in between
    
frames, which is needed in theory even though I've never actually seen a
    
sample that relies on it in practice. May or may not work.
    

    Since the distinction matters greatly for parsing the color matrix
    
values, this includes a small helper function to guess the right profile
    
from the RPU itself in case the user has forgotten to forward the dovi
    
configuration record to the decoder. (Which in practice, only ffmpeg.c
    
and ffplay do..)
    

    Notable omissions / deviations :

    - CRC32 verification. This is based on the MPEG2 CRC32 type, which is
    
  similar to IEEE CRC32 but apparently different in subtle enough ways
    
  that I could not get it to pass verification no matter what parameters
    
  I fed to av_crc. It's possible the code needs some changes.

    - Linear interpolation support. Nothing documents this (beyond its
    
  existence) and no samples use it, so impossible to implement.

    - All of the extension metadata blocks, but these contain values that
    
  seem largely congruent with ST2094, HDR10, or other existing forms of
    
  side data, so I will defer parsing/attaching them to a future commit.

    - The patent describes a mechanism for predicting coefficients from
    
  previous RPUs, but the bit for the flag whether to use the
    
  prediction deltas or signal entirely new coefficients does not seem to
    
  be present in actual RPUs, so we ignore this subsystem entirely.

    - In the patent's spec, the NLQ subsystem also loops over
    
  num_nlq_pivots, but even in the patent the number is hard-coded to one
    
  iteration rather than signalled. So we only store one set of coefs.
    

    Heavily influenced by https://github.com/quietvoid/dovi_tool
    
Documentation drawn from US Patent 10,701,399 B2 and ETSI GS CCM 001
    

    Signed-off-by : Niklas Haas <git@haasn.dev>
    
Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
    • [DH] configure
    • [DH] libavcodec/Makefile
    • [DH] libavcodec/dovi_rpu.c
    • [DH] libavcodec/dovi_rpu.h

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