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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 (...)

  • Formulaire personnalisable

    21 juin 2013, par

    Cette page présente les champs disponibles dans le formulaire de publication d’un média et il indique les différents champs qu’on peut ajouter. Formulaire de création d’un Media
    Dans le cas d’un document de type média, les champs proposés par défaut sont : Texte Activer/Désactiver le forum ( on peut désactiver l’invite au commentaire pour chaque article ) Licence Ajout/suppression d’auteurs Tags
    On peut modifier ce formulaire dans la partie :
    Administration > Configuration des masques de formulaire. (...)

  • Qu’est ce qu’un masque de formulaire

    13 juin 2013, par

    Un masque de formulaire consiste en la personnalisation du formulaire de mise en ligne des médias, rubriques, actualités, éditoriaux et liens vers des sites.
    Chaque formulaire de publication d’objet peut donc être personnalisé.
    Pour accéder à la personnalisation des champs de formulaires, il est nécessaire d’aller dans l’administration de votre MediaSPIP puis de sélectionner "Configuration des masques de formulaires".
    Sélectionnez ensuite le formulaire à modifier en cliquant sur sont type d’objet. (...)

Sur d’autres sites (3852)

  • Programming Language Levels

    20 mai 2011, par Multimedia Mike — Programming

    I’ve been doing this programming thing for some 20 years now. Things sure do change. One change I ponder from time to time is the matter of programming language levels. Allow me to explain.

    The 1990s
    When I first took computer classes in the early 1990s, my texts would classify computer languages into 3 categories, or levels. The lower the level, the closer to the hardware ; the higher the level, the more abstract (and presumably, easier to use). I recall that the levels went something like this :

    • High level : Pascal, BASIC, Logo, Fortran
    • Medium level : C, Forth
    • Low level : Assembly language

    Keep in mind that these were the same texts which took the time to explain the history of computers from mainframes -> minicomputers -> a relatively recent phenomenon called microcomputers or "PCs".

    Somewhere in the mid-late 1990s, when I was at university, I was introduced to a new tier :

    • Very high level : Perl, shell scripting

    I think there was some debate among my peers about whether C++ and Java were properly classified as high or very high level. The distinction between high and very high, in my observation, seemed to be that very high level languages had more complex data structures (at the very least, a hash / dictionary / associative array / key-value map) built into the language, as well as implicit memory management.

    Modern Day
    These days, the old hierarchy is apparently forgotten (much like minicomputers). I observe that there is generally a much simpler 2-tier classification :

    • Low level : C, assembly language
    • High level : absolutely every other programming language in wide use today

    I find myself wondering where C++ and Objective-C fit in this classification scheme. Then I remember that it doesn’t matter and this is all academic.

    Relevancy
    I think about this because I have pretty much stuck to low-level programming all of my life, mostly due to my interest in game and multimedia-type programming. But the trends in computing have favored many higher level languages and programming paradigms. I woke up one day and realized that the kind of work I often do — lower level stuff — is not very common.

    I’m not here to argue that low or high level is superior. You know I’m all about using the appropriate tool for the job. But I sometimes find myself caught between worlds, having the defend and explain one to the other.

    • On one hand, it’s not unusual for the multitudes of programmers working at the high level to gasp and wonder why I or anyone else would ever use C or assembly language for anything when there are so many beautiful high level languages. I patiently explain that those languages have to be written in some other language (at first) and that they need to run on some operating system and that most assuredly won’t be written in a high level language. For further reading, I refer them to Joel Spolsky’s great essay called Back to Basics which describes why it can be useful to know at least a little bit about how the computer does what it does at the lowest levels.
    • On the other hand, believe it or not, I sometimes have to defend the merits of high level languages to my low level brethren. I’ll often hear variations of, "Any program can be written in C. Using a high level language to achieve the same will create a slow and bloated solution." I try to explain that the trade-off in time to complete the programming task weighed against the often-negligible performance hit of what is often an I/O-bound operation in the first place makes it worthwhile to use the high level language for a wide variety of tasks.

      Or I just ignore them. That’s actually the best strategy.

  • Generating grey nosie with FFmpeg

    5 mars, par Azat Khabibulin

    I have the following sound configuration :

    


    sub-bass:     -inf dBFS
low bass:     -inf dBFS
bass:         -inf dBFS
high bass:    -inf dBFS
low mids:     0 dBFS
mids:         0 dBFS
high mids:    -inf dBFS
low treble:   -inf dBFS
treble:       -inf dBFS
high treble:  -inf dBFS


    


    If you wonder what is it, you can listen to this sound here.

    


    I'd like to create an audio file provided this sound configuration. FFmpeg filters seem like a good fit, but are not a strict requirement. It may be any command-line tool that handles this kind of task well.

    


    The problem is that I don't really have necessary background in audio theory. I cannot choose the right FFmpeg filter (other than to make a generic white noise), I do not know how to filter frequencies in FFmpeg, I cannot even convert this particular lexicon ("bass", "mids", etc.) into specific numeric frequencies.

    


  • Revision 7f6cddb58f : Take out assertion for block_yrd in rtc coding flow The internal behavior of bl

    17 juin 2015, par Jingning Han

    Changed Paths :
     Modify /vp9/encoder/vp9_pickmode.c



    Take out assertion for block_yrd in rtc coding flow

    The internal behavior of block_yrd differs in high bit depth
    settings from 8-bit one. This causes the assertion condition not
    true for high bit depth.

    Change-Id : I15dc02e7162d27cabe78c451941d769d488b1174