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  • MediaSPIP Core : La Configuration

    9 November 2010, by

    MediaSPIP Core fournit par défaut trois pages différentes de configuration (ces pages utilisent le plugin de configuration CFG pour fonctionner) : une page spécifique à la configuration générale du squelettes; une page spécifique à la configuration de la page d’accueil du site; une page spécifique à la configuration des secteurs;
    Il fournit également une page supplémentaire qui n’apparait que lorsque certains plugins sont activés permettant de contrôler l’affichage et les fonctionnalités spécifiques de (...)

  • Personnaliser en ajoutant son logo, sa bannière ou son image de fond

    5 September 2013, by

    Certains thèmes prennent en compte trois éléments de personnalisation : l’ajout d’un logo; l’ajout d’une bannière l’ajout d’une image de fond;

  • Librairies et logiciels spécifiques aux médias

    10 December 2010, by

    Pour un fonctionnement correct et optimal, plusieurs choses sont à prendre en considération.
    Il est important, après avoir installé apache2, mysql et php5, d’installer d’autres logiciels nécessaires dont les installations sont décrites dans les liens afférants. Un ensemble de librairies multimedias (x264, libtheora, libvpx) utilisées pour l’encodage et le décodage des vidéos et sons afin de supporter le plus grand nombre de fichiers possibles. Cf. : ce tutoriel; FFMpeg avec le maximum de décodeurs et (...)

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  • Batch Programming Looping?

    13 May 2013, by Michael Barth

    I'm not an expert in batch programming, my only skill is in C\C++. I'm not even sure how to go about this really.

    I've got a bunch of videos like Video1.mp4, Video2.mp4 (that's not their actual names, but they do have numbers indicating beginning and end)

    Basically I have this FFMPEG command that I can use to convert all of these to an aspect ratio of 16:10 that looks something like this:

    "ffmpeg -i "Section 1 Video 1.mp4" -aspect 16:10 OutSection 1 Video 1.mp4"
    
"ffmpeg -i "Section 1 Video 2.mp4" -aspect 16:10 OutSection 1 Video 2.mp4"
    
"ffmpeg -i "Section 2 Video 1.mp4" -aspect 16:10 OutSection 2 Video 1.mp4"

    Now instead of writing this command over and over again, is there anyway for me to substitute the numbers for actual variables? I know that Section 1 ends at Video 27 and Section 2 ends at Video 26 and so on. Basically I need the loop to run 165 times so I don't need to write the command 165 times.

    Or is this beyond the scope of capability of a mere batch program?

  • x264 library speed - Altivec vs SSE2 -

    25 February 2013, by Omer Merdan

    I have simple cheap dualcore intel-3ghz-debian and access to super-expensive powerPc7-Aix.

    And after few days of strugle, i compiled libx264 and tested it on both computers:

    1. GCC: library x264 on intel (with SSE2 capabilities) and
    2. GCC on 16 core powerPc (with altivec).

    ... and result is that cheap intel is x2 times faster ! (with altivec disabled, intel is 10x times faster)

    My question: is this normal?
    Does all other powerPC-users have same results? Can powerPc-altivec-optimisation of x264 library work at same speed with intel... or MMX/SSE optimisation is officially at least 2 times faster for this library?

    I am not interested in multi-thread options. Number of cores and threads are irrelevant. Just simple one-thread x264 encoding with default "medium preset" using rawvideo as source, sse vs altivec.

    Maybe native Aix XLC compiler provide better results? (i managed only gcc to work)

    ... mac-powerpc-users maybe know something about this.

    powrPc7-Aix:$ time (cat raw10sec.y4m |x264 --input-res 720x576 --fps 50 -o /dev/null -)
    
x264: 64-bit XCOFF
    
x264 [info]: using cpu capabilities: Altivec
    
time: real 0m33.559s
    
---
    
intelDebian:$ time (cat raw10sec.y4m |x264 --input-res 720x576 --fps 50 -o /dev/null -)
    
x264: ELF 32-bit LSB executable
    
x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.1 Cache64
    
time: real 0m16.503s

  • x264 library speed - Altivec vs SSE2 -

    25 February 2013, by Omer Merdan

    I have simple cheap dualcore intel-3ghz-debian and access to super-expensive powerPc7-Aix.

    And after few days of strugle, i compiled libx264 and tested it on both computers:

    1. GCC: library x264 on intel (with SSE2 capabilities) and
    2. GCC on 16 core powerPc (with altivec).

    ... and result is that cheap intel is x2 times faster ! (with altivec disabled, intel is 10x times faster)

    My question: is this normal?
    Does all other powerPC-users have same results? Can powerPc-altivec-optimisation of x264 library work at same speed with intel... or MMX/SSE optimisation is officially at least 2 times faster for this library?

    I am not interested in multi-thread options. Number of cores and threads are irrelevant. Just simple one-thread x264 encoding with default "medium preset" using rawvideo as source, sse vs altivec.

    Maybe native Aix XLC compiler provide better results? (i managed only gcc to work)

    ... mac-powerpc-users maybe know something about this.

    powrPc7-Aix:$ time (cat raw10sec.y4m |x264 --input-res 720x576 --fps 50 -o /dev/null -)
    
x264: 64-bit XCOFF
    
x264 [info]: using cpu capabilities: Altivec
    
time: real 0m33.559s
    
---
    
intelDebian:$ time (cat raw10sec.y4m |x264 --input-res 720x576 --fps 50 -o /dev/null -)
    
x264: ELF 32-bit LSB executable
    
x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.1 Cache64
    
time: real 0m16.503s

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