Recherche avancée

Médias (0)

Mot : - Tags -/publication

Aucun média correspondant à vos critères n’est disponible sur le site.

Autres articles (70)

  • 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

  • Contribute to documentation

    13 avril 2011

    Documentation is vital to the development of improved technical capabilities.
    MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
    To contribute, register to the project users’ mailing (...)

  • Ecrire une actualité

    21 juin 2013, par

    Présentez les changements dans votre MédiaSPIP ou les actualités de vos projets sur votre MédiaSPIP grâce à la rubrique actualités.
    Dans le thème par défaut spipeo de MédiaSPIP, les actualités sont affichées en bas de la page principale sous les éditoriaux.
    Vous pouvez personnaliser le formulaire de création d’une actualité.
    Formulaire de création d’une actualité Dans le cas d’un document de type actualité, les champs proposés par défaut sont : Date de publication ( personnaliser la date de publication ) (...)

Sur d’autres sites (5786)

  • Revision e4686c589e : Fix slightly quality drop caused at speed 1. We would skip the rectangular bloc

    19 juillet 2013, par Ronald S. Bultje

    Changed Paths :
     Modify /vp9/encoder/vp9_encodeframe.c



    Fix slightly quality drop caused at speed 1.

    We would skip the rectangular blocks for sub8x8 partitions because
    we would conclude that PARTITION_NONE was better than PARTITION_SPLIT,
    however, that conclusion was made before we actually really tested
    PARTITION_SPLIT.

    Change-Id : I8fa91e59894badc1d8cee3ba8a49e40ae4c4a489

  • x264 library speed - Altivec vs SSE2 -

    25 février 2013, par 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 SSE4 -

    15 août 2015, par Asain Kujovic

    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

Navigation