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Autres articles (45)

  • 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 (...)

  • Ajouter notes et légendes aux images

    7 février 2011, par

    Pour pouvoir ajouter notes et légendes aux images, la première étape est d’installer le plugin "Légendes".
    Une fois le plugin activé, vous pouvez le configurer dans l’espace de configuration afin de modifier les droits de création / modification et de suppression des notes. Par défaut seuls les administrateurs du site peuvent ajouter des notes aux images.
    Modification lors de l’ajout d’un média
    Lors de l’ajout d’un média de type "image" un nouveau bouton apparait au dessus de la prévisualisation (...)

  • Use, discuss, criticize

    13 avril 2011, par

    Talk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
    The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
    A discussion list is available for all exchanges between users.

Sur d’autres sites (8563)

  • avcodec/tiff : pass arguments to bytestream2_seek in the right order

    31 janvier 2024, par Leo Izen
    avcodec/tiff : pass arguments to bytestream2_seek in the right order

    The function signature for bytestream2_seek is (gb, offset, whence) ;
    
Before this patch, the code passed (gb, SEEK_SET, offset), which is
    
incorrect.
    

    Siged-off-by : Leo Izen <leo.izen@gmail.com>
    • [DH] libavcodec/tiff.c

  • Revision 41a350a83d : Change eob threshold for partial inverse 8x8 2D-DCT to 12 The scanning order ha

    8 mai 2014, par Jingning Han

    Changed Paths :
     Modify /test/partial_idct_test.cc


     Modify /vp9/common/arm/neon/vp9_idct8x8_add_neon.asm


     Modify /vp9/common/mips/dspr2/vp9_itrans8_dspr2.c


     Modify /vp9/common/vp9_idct.c


     Modify /vp9/common/vp9_rtcd_defs.pl


     Modify /vp9/common/x86/vp9_idct_intrin_sse2.c


     Modify /vp9/common/x86/vp9_idct_ssse3.asm



    Change eob threshold for partial inverse 8x8 2D-DCT to 12

    The scanning order has the first 12 coefficients of the 8x8 2D-DCT
    sitting in the top left 4x4 block. Hence the partial inverse 8x8
    2D-DCT allows to handle cases with eob below 12.

    The overall runtime of the inverse 8x8 2D-DCT unit is reduced from
    166 cycles (using SSE2) to 150 cycles (using SSSE3).

    Change-Id : I4514f9748042809ac84df4c14382c00f313f1cd2

  • Change order of codecs that ffmpeg will attempt [closed]

    11 septembre 2024, par Martin Rauscher

    TBH this might be a bug since I cannot see why this would be designed behavior :

    &#xA;

    I'm converting user-submitted videos to png thumbnails with this command.

    &#xA;

    ffmpeg $codec -xerror -ss 1 -t 0.05 -i "$1" -update 1 -frames:v 1 -vf "scale=-1:256" -y "thumb.png"&#xA;

    &#xA;

    This works great when there is no transparency involved, but when it is I get PNGs with black (or green, whatever the non-transparent component is) background. I need to manually select the input codec for VP8 (alpha_mode=1), VP9, and fallback (seems to use vp8 (native)) like this to fix it

    &#xA;

    for codec in "-vcodec libvpx-vp9" "-vcodec libvpx" ""; do&#xA;

    &#xA;

    Now my questions are

    &#xA;

      &#xA;
    • is there a way to just set my preference order of codecs as a command line option ?

      • &#xA;

    • WHY is FFMPEG failing to use the best codec in the first place ?

      • &#xA;

    &#xA;

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