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  • Utilisation et configuration du script

    19 janvier 2011, par

    Informations spécifiques à la distribution Debian
    Si vous utilisez cette distribution, vous devrez activer les dépôts "debian-multimedia" comme expliqué ici :
    Depuis la version 0.3.1 du script, le dépôt peut être automatiquement activé à la suite d’une question.
    Récupération du script
    Le script d’installation peut être récupéré de deux manières différentes.
    Via svn en utilisant la commande pour récupérer le code source à jour :
    svn co (...)

  • 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 (...)

  • List of compatible distributions

    26 avril 2011, par

    The table below is the list of Linux distributions compatible with the automated installation script of MediaSPIP. Distribution nameVersion nameVersion number Debian Squeeze 6.x.x Debian Weezy 7.x.x Debian Jessie 8.x.x Ubuntu The Precise Pangolin 12.04 LTS Ubuntu The Trusty Tahr 14.04
    If you want to help us improve this list, you can provide us access to a machine whose distribution is not mentioned above or send the necessary fixes to add (...)

Sur d’autres sites (5930)

  • Revision ea284d6281 : added checks to prevent rate/distortion overflow At speed 2, due to the thresho

    20 juillet 2013, par Yaowu Xu

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



    added checks to prevent rate/distortion overflow

    At speed 2, due to the threshold scheme used, it is possible the rate
    and distortion assigned with INT_MAX value. The patch added checking
    to prevent the INT_MAX value is used in further calculation of RD
    scores. The patch also changed the assertion in rd_use_partition() to
    be mirror similar assertion in rd_pick_partition().

    Change-Id : Idb52c543cc1e10abdf6e6a5d6e9cb535a42214dc

  • 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

  • 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

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