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Autres articles (63)

  • Encodage et transformation en formats lisibles sur Internet

    10 avril 2011

    MediaSPIP transforme et ré-encode les documents mis en ligne afin de les rendre lisibles sur Internet et automatiquement utilisables sans intervention du créateur de contenu.
    Les vidéos sont automatiquement encodées dans les formats supportés par HTML5 : MP4, Ogv et WebM. La version "MP4" est également utilisée pour le lecteur flash de secours nécessaire aux anciens navigateurs.
    Les documents audios sont également ré-encodés dans les deux formats utilisables par HTML5 :MP3 et Ogg. La version "MP3" (...)

  • 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 (...)

  • Les autorisations surchargées par les plugins

    27 avril 2010, par

    Mediaspip core
    autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs

Sur d’autres sites (8107)

  • Color matching by color mapping using feature detection

    22 mai 2018, par Fabien Biller

    My goal is to match colors of two videos filming the same scene at slightly different positions. For this purpose, I created an algorithm that searches for corresponding features in one matching still frame of both videos. I then normalized the color relationships of the matching pixels

    (r-value + 1) / 256
    
(g-value + 1) / 256
    
(b-value + 1) / 256

    and converted them into curves as in

    curves=r='0.1/0.2 ...':g=....'

    Yet the result is rubbish.

    I need to actually tell ffmpeg with a number of rgb-values : "This rgb-value is to be this rgb-value" and not separately map each red value of for instance 66 to 22, but map each 66-22-18 to 44-77-123. The missing mappings should be interpolated.

    Or can a list of

    Color1 maps to Color2

    be converted into curves or similar ?

  • vf_tonemap : Fix logic for detecting the maximum peak of untagged sources

    25 juillet 2018, par Vittorio Giovara
    vf_tonemap : Fix logic for detecting the maximum peak of untagged sources

    When there is no metadata attached to a frame, take into account both
    
the PQ and HLG transfers, and change the HLG default value to 10 :
    
the value of 12 is the maximum range in scene referred light, but
    
the reference OOTF maps this from 0 to 1000 cd/m² on the ideal HLG
    
monitor.
    

    This matches what vf_tonemap_opencl does.
    • [DH] libavfilter/vf_tonemap.c

  • avutil/hwcontext_vdpau : Map 444 pix fmts to new VdpYCbCr types

    3 mai 2019, par ManojGuptaBonda
    avutil/hwcontext_vdpau : Map 444 pix fmts to new VdpYCbCr types

    New VdpYCbCr Formats VDP_YCBCR_FORMAT_Y_U_V_444 and,
    
VDP_YCBCR_FORMAT_Y_UV_444 have been added in VDPAU with libvdpau-1.2
    
to be used in get/putbits for YUV 4:4:4 surfaces. Earlier mapping of
    
AV_PIX_FMT_YUV444P to VDP_YCBCR_FORMAT_YV12 is not valid.
    

    Hence this Change maps AV_PIX_FMT_YUV444P to VDP_YCBCR_FORMAT_Y_U_V_444
    
to access the YUV 4:4:4 surface via read-back API's of VDPAU.
    • [DH] libavutil/hwcontext_vdpau.c
    • [DH] libavutil/version.h

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