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Autres articles (89)

  • À propos des documents

    21 juin 2013, par

    Que faire quand un document ne passe pas en traitement, dont le rendu ne correspond pas aux attentes ?
    Document bloqué en file d’attente ?
    Voici une liste d’actions ordonnée et empirique possible pour tenter de débloquer la situation : Relancer le traitement du document qui ne passe pas Retenter l’insertion du document sur le site MédiaSPIP Dans le cas d’un média de type video ou audio, retravailler le média produit à l’aide d’un éditeur ou un transcodeur. Convertir le document dans un format (...)

  • Le profil des utilisateurs

    12 avril 2011, par

    Chaque utilisateur dispose d’une page de profil lui permettant de modifier ses informations personnelle. Dans le menu de haut de page par défaut, un élément de menu est automatiquement créé à l’initialisation de MediaSPIP, visible uniquement si le visiteur est identifié sur le site.
    L’utilisateur a accès à la modification de profil depuis sa page auteur, un lien dans la navigation "Modifier votre profil" est (...)

  • XMP PHP

    13 mai 2011, par

    Dixit Wikipedia, XMP signifie :
    Extensible Metadata Platform ou XMP est un format de métadonnées basé sur XML utilisé dans les applications PDF, de photographie et de graphisme. Il a été lancé par Adobe Systems en avril 2001 en étant intégré à la version 5.0 d’Adobe Acrobat.
    Étant basé sur XML, il gère un ensemble de tags dynamiques pour l’utilisation dans le cadre du Web sémantique.
    XMP permet d’enregistrer sous forme d’un document XML des informations relatives à un fichier : titre, auteur, historique (...)

Sur d’autres sites (18723)

  • FFMPEG - changing pixel format from 24-bit RGB to 8-bit Grayscale only changes color, but not file size

    27 septembre 2018, par Minjun Seong

    I am using the avlib* libraries and currently using the sws_getContext function to change pixel format from RGB (AV_PIX_FMT_RGB24) to grayscale (AV_PIX_FMT_GRAY8). The expected behavior should have been that the output file size should have decreased by 3 times as we are going from 24 bit rgb to 8 bit grayscale, but it stayed the same. Furthermore, when I checked on Media-Coder to see the format, the video format was still RGB. Any ideas on why the file size didn’t change and why the file format is still RGB ?

    Note : the video DID change to black and white as expected.

  • How Many Default Languages ?

    26 janvier 2012, par Multimedia Mike — Programming

    I was thinking back to my childhood, when my family first owned a computer. It was an MS-DOS-powered IBM PC. The default OS came with 2 programming environments, such as they were : GW-BASIC and batch files. It was a start, I suppose. I guess most any microcomputer you can name from that era came with some kind of BASIC interpreter. That defined the computer’s “out of the box” programmability.

    Then I started wondering how this compares to computers (operating systems/distributions, really) these days. So I installed a fresh version of the latest Ubuntu Linux version (11.10 as of this writing ; x86_32) and looked for programmability (without installing anything else). This is what I came up with :

    1. gcc/C (only the C compiler ; other components of the GNU compiler collection are installed separately)
    2. Perl
    3. Python
    4. C#, as furnished by Mono
    5. Bash — can’t forget about the shell as a full-featured programming language (sh is also present, but not t/csh)
    6. JavaScript — since Firefox is installed per default, JS counts
    7. GNU Assember — thanks to Reimar for the reminder that if gcc is present, gas necessarily needs to be there as well

    I checked on C++, Objective C, Java, Ada, Fortran, Go, Lua, Ruby, Tcl, PHP, R and other languages I could think of, but the above items were the only ones present by default. At the same time, I checked my Mac OS X (10.6) box and it also has Ruby and PHP installed. It has a bunch of other languages, courtesy of Xcode, so I can’t certify anything about its out of the box programmability.

    Still, I think “embarrassment of riches” pretty well sums it up. I try not to be crotchety old fogey complaining that kids these days don’t know how good they have it ; rather, I’m genuinely excited for anyone who wants to leap into computer programming in this day and age.

  • FFMPEG - changing pixel format from 24-bit RGB to 8-bit Grayscale does not change file size

    26 septembre 2018, par Minjun Seong

    I am using the avlib* libraries and currently using the sws_getContext function to change pixel format from RGB (AV_PIX_FMT_RGB24) to grayscale (AV_PIX_FMT_GRAY8). The expected behavior should have been that the output file size should have decreased by 3 times, but it stayed the same. Furthermore, when I checked on Media-Coder to see the format, the video format was still RGB. Any ideas on why the file size didn’t change and why the file format is still RGB ?

    Note : the video DID change to black and white as expected.

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