Recherche avancée

Médias (1)

Mot : - Tags -/Christian Nold

Autres articles (37)

  • Support de tous types de médias

    10 avril 2011

    Contrairement à beaucoup de logiciels et autres plate-formes modernes de partage de documents, MediaSPIP a l’ambition de gérer un maximum de formats de documents différents qu’ils soient de type : images (png, gif, jpg, bmp et autres...) ; audio (MP3, Ogg, Wav et autres...) ; vidéo (Avi, MP4, Ogv, mpg, mov, wmv et autres...) ; contenu textuel, code ou autres (open office, microsoft office (tableur, présentation), web (html, css), LaTeX, Google Earth) (...)

  • 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 (...)

  • Selection of projects using MediaSPIP

    2 mai 2011, par

    The examples below are representative elements of MediaSPIP specific uses for specific projects.
    MediaSPIP farm @ Infini
    The non profit organizationInfini develops hospitality activities, internet access point, training, realizing innovative projects in the field of information and communication technologies and Communication, and hosting of websites. It plays a unique and prominent role in the Brest (France) area, at the national level, among the half-dozen such association. Its members (...)

Sur d’autres sites (6327)

  • Revision df90d58f4f : Speed up motion estimation using small partitions' result(experiment) Current p

    3 juillet 2013, par Yunqing Wang

    Changed Paths :
     Modify /vp9/encoder/vp9_block.h


     Modify /vp9/encoder/vp9_encodeframe.c


     Modify /vp9/encoder/vp9_onyx_if.c


     Modify /vp9/encoder/vp9_onyx_int.h


     Modify /vp9/encoder/vp9_rdopt.c



    Speed up motion estimation using small partitions' result(experiment)

    Current partition checking starts from small sizes, and then goes up
    to large sizes. This experiment uses the small partitions' motion
    estimation result, which is already available, to speed up the
    large partition's motion estimation. We can decide to skip some
    patition checkings if they are unlikely choices. We could use the
    motion vector(MV) result as current partition's prediction MV, limit
    the search range and reference frame.

    Current result at speed 1 :
    psnr loss : 1.19% for stdhd, 0.287% for derf.
    speed gain : 14% for sunflower(hd), 11% for akiyo.

    Further improvement will be done later.

    Change-Id : I5abfd070e9cace2e91e2a0247d1325df313887ab

  • Revision faff6ed0fb : Skip duplicate block encoding in the rd loop This speed feature allows the enco

    9 juillet 2013, par Jingning Han

    Changed Paths :
     Modify /vp9/encoder/vp9_block.h


     Modify /vp9/encoder/vp9_encodeframe.c


     Modify /vp9/encoder/vp9_encodeintra.c


     Modify /vp9/encoder/vp9_encodemb.c


     Modify /vp9/encoder/vp9_onyx_if.c


     Modify /vp9/encoder/vp9_onyx_int.h


     Modify /vp9/encoder/vp9_rdopt.c


     Modify /vp9/encoder/vp9_rdopt.h



    Skip duplicate block encoding in the rd loop

    This speed feature allows the encoder to largely remove the spatial
    dependency between blocks inside a 64x64 superblock, thereby removing
    the need to repeatedly encode superblocks per partition type in the
    rate-distortion optimization loop.

    A major challenge lies in the intra modes tested in the rate-distortion
    optimization loop. The subsequent blocks do not have access to the
    reconstructed boundary pixels without the intermediate coding steps.
    This was resolved by using the original pixels for intra prediction
    in the rd loop, followed by an appropriately designed distortion
    modeling on the quantization parameters. Experiments also suggested
    that the performance impact is more discernible at lower bit-rate/psnr
    settings. Hence a quantizer dependent threshold is applied to deactivate
    skip of block coding.

    For bus_cif at 2000 kbps,
    speed 0 : runtime 269854ms -> 237774ms (12% speed-up) at 0.05dB
    performance loss.

    speed 1 : runtime 65312ms -> 61536ms, (7% speed-up) at 0.04dB
    performance loss.

    This operation is currently turned on in settings of speed 1.

    Change-Id : Ib689741dfff8dd38365d8c1b92860a3e176f56ec

  • Revision 53ff43adc3 : Prunes out full-rd computation based on modeled rd Adds a speed feature to elim

    9 juillet 2013, par Deb Mukherjee

    Changed Paths :
     Modify /vp9/common/vp9_blockd.h


     Modify /vp9/encoder/vp9_onyx_if.c


     Modify /vp9/encoder/vp9_onyx_int.h


     Modify /vp9/encoder/vp9_rdopt.c



    Prunes out full-rd computation based on modeled rd

    Adds a speed feature to eliminate full-rd computation if the modeled
    rd or rd based on a different parameter in the same mode is already
    a lot larger than the best rd yet.

    Specifically, only search the sharp and smooth filters if the modeled
    rd cost based on the regular filter is within a certain factor of the
    best rd cost so far. Also, skip full-rd computation of non splitmv
    inter modes if the modeled rd cost based on pred error is within the
    same factor of the best rd cost so far.

    Also adds some enhancements in the rd search for splitmv mode to
    speed things up by early breakouts. Negligible impact on performance.

    Resuts on derfraw300 :
    psnr : -0.013% with the splitmv enhancements, -0.24% with the rd
    breakout feature on.
    speedup : 6% with splitmv enhancements, 20% with also residual breakout
    (tested on football sequence at 600 Kbps)

    Change-Id : I37abc308ea9f110c1679ce649b6a7e73ab1ad5fc

Navigation