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Mot : - Tags -/creative commons

Autres articles (99)

  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

  • Creating farms of unique websites

    13 avril 2011, par

    MediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
    This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)

  • 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.

Sur d’autres sites (11255)

  • How to stop ffmpeg when get a long black screen

    4 juin 2018, par sonseiya

    i want to know if there is a way to stop ffmpeg command when a black frame in an interval of time is detected.

    I mean, if the video i am getting is a black screen and it is of 3 seconds of duration, for example, i would like ffmpeg stops.

    Regards

  • Ffmpeg mathematical "expression" syntax in filters

    9 novembre 2022, par Jason C

    Multiple ffmpeg filters take a mathematical expression as a parameter, for example setpts and select (examples from docs) :

    


    setpts='1/(25*TB) * (N + 0.05 * sin(N*2*PI/25))';
select=select=between(t\,10\,20)


    


    The docs for each filter are generally good about listing available variables for that specific filter, but the actual syntax of this expression appears (?) to be completely undocumented, despite its heavy use. For example, what functions are available (e.g. sin, between) ? Are boolean combinations allowable and if so, what are the operators ? What other mathematical operators are available ?

    


    What is the syntax of these expressions ? Or, at the very least, is some non-ffmpeg library parsing them and if so, what is it ? That way I can at least look up the syntax. Or have I missed some documentation section somewhere...?

    


  • vp8/armv6 : mc : avoid boolean expression in calculation

    9 juillet 2016, par Janne Grunau
    vp8/armv6 : mc : avoid boolean expression in calculation

    GNU as evaluates true as ’-1’ while Apple’s variant and llvm’s internal
    
assembler evaluate it as ’1’. The best way to avoid this madness is to
    
eliminate boolean expressions instead of trying to fix it with
    
preprocessor directives. Use a direct formula to calculate the
    
required temporary space on the stack in
    
ff_put_vp8_epel,bilin4,8,16_h[246]v[246]_armv6().
    

    Fixes a checkasm segfault in vp8dsp.mc when using llvm’s internal
    
assembler for a non-Apple target.
    • [DBH] libavcodec/arm/vp8dsp_armv6.S

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