Recherche avancée

Médias (91)

Autres articles (56)

  • Submit bugs and patches

    13 avril 2011

    Unfortunately a software is never perfect.
    If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
    If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
    You may also (...)

  • MediaSPIP 0.1 Beta version

    25 avril 2011, par

    MediaSPIP 0.1 beta is the first version of MediaSPIP proclaimed as "usable".
    The zip file provided here only contains the sources of MediaSPIP in its standalone version.
    To get a working installation, you must manually install all-software dependencies on the server.
    If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...)

  • Participer à sa traduction

    10 avril 2011

    Vous pouvez nous aider à améliorer les locutions utilisées dans le logiciel ou à traduire celui-ci dans n’importe qu’elle nouvelle langue permettant sa diffusion à de nouvelles communautés linguistiques.
    Pour ce faire, on utilise l’interface de traduction de SPIP où l’ensemble des modules de langue de MediaSPIP sont à disposition. ll vous suffit de vous inscrire sur la liste de discussion des traducteurs pour demander plus d’informations.
    Actuellement MediaSPIP n’est disponible qu’en français et (...)

Sur d’autres sites (3870)

  • Revision f7f0eaa581 : Add adaptation option for VBR. Allow min and maxQ to creep when the undershoot

    13 octobre 2014, par Paul Wilkins

    Changed Paths :
     Modify /vp9/encoder/vp9_firstpass.c


     Modify /vp9/encoder/vp9_firstpass.h


     Modify /vp9/encoder/vp9_ratectrl.c


     Modify /vp9/encoder/vp9_ratectrl.h



    Add adaptation option for VBR.

    Allow min and maxQ to creep when the undershoot
    or overshoot exceeds thresholds controlled by the
    command line under_shoot_pct and over_shoot_pct
    values.

    Default is 100%,100% which disables adaptation.

    Derf results for example undershoot% / overshoot% :-

    Head :- Mean abs (%rate error) = 14.4%

    This check in :-
    25%/25% - Mean abs (%rate error) = 6.7%
    PSNR hit -1% SSIM -0.1%

    5% / 5% - Mean abs (%rate error) = 2.2%
    PSNR hit -3.3% SSIM - 1.1%

    Most of the remaining error and most of the quality hit is
    at extreme data rates. The adaptation code still has an
    exception for material that is in effect static so that we
    don’t over adjust and over spend on YT slide show type
    content.

    (Rebase of If25a2449a415449c150acff23df713e9598d64c9
    to resolve a auto-merge error)

    Change-Id : Iec4e1613ef0d067454751d8220edb7058dfbd816

  • Revision 869d4ca519 : Add adaptation option for VBR. Allow min and maxQ to creep when the undershoot

    9 octobre 2014, par Paul Wilkins

    Changed Paths :
     Modify /vp9/encoder/vp9_firstpass.c


     Modify /vp9/encoder/vp9_firstpass.h


     Modify /vp9/encoder/vp9_ratectrl.c


     Modify /vp9/encoder/vp9_ratectrl.h



    Add adaptation option for VBR.

    Allow min and maxQ to creep when the undershoot
    or overshoot exceeds thresholds controlled by the
    command line under_shoot_pct and over_shoot_pct
    values.

    Default is 100%,100% which disables adaptation.

    Derf results for example undershoot% / overshoot% :-

    Head :- Mean abs (%rate error) = 14.4%

    This check in :-
    25%/25% - Mean abs (%rate error) = 6.7%
    PSNR hit -1% SSIM -0.1%

    5% / 5% - Mean abs (%rate error) = 2.2%
    PSNR hit -3.3% SSIM - 1.1%

    Most of the remaining error and most of the quality hit is
    at extreme data rates. The adaptation code still has an
    exception for material that is in effect static so that we
    don’t over adjust and over spend on YT slide show type
    content.

    Change-Id : If25a2449a415449c150acff23df713e9598d64c9

  • Revision 0e1068a4bd : Improve two pass VBR accuracy. Adjustments to the GF interval choice and minimu

    26 septembre 2014, par Paul Wilkins

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


     Modify /vp9/encoder/vp9_firstpass.c


     Modify /vp9/encoder/vp9_ratectrl.c



    Improve two pass VBR accuracy.

    Adjustments to the GF interval choice and minimum boost.
    Adjustment to the calculation of 2 pass worst q.
    Compared to 09/29 head there is metrics hit on derf of
    (-0.123%,-0.191%)

    Compared to the September 29 head and a baseline on
    September 18 baseline the accuracy of the VBR rate control
    measured on the derf set is as follows :-

    Mean error % / Mean abs(error %)
    Sept 18 baseline (-7.0% / 14.76%)
    Sept 29 head (-15.7%, 19.8%)
    This check in (-1.5% / 14.4%)

    The mean undershoot is reduced slightly but the
    worst case overshoot on e.g. harbour/highway is
    increased. This will be addressed in a later patch.

    Change-Id : Iffd9b0ab7432a131c98fbaaa82d1e5b40be72b58

Navigation