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  • Qualité du média après traitement

    21 juin 2013, par

    Le bon réglage du logiciel qui traite les média est important pour un équilibre entre les partis ( bande passante de l’hébergeur, qualité du média pour le rédacteur et le visiteur, accessibilité pour le visiteur ). Comment régler la qualité de son média ?
    Plus la qualité du média est importante, plus la bande passante sera utilisée. Le visiteur avec une connexion internet à petit débit devra attendre plus longtemps. Inversement plus, la qualité du média est pauvre et donc le média devient dégradé voire (...)

  • Submit enhancements and plugins

    13 avril 2011

    If you have developed a new extension to add one or more useful features to MediaSPIP, let us know and its integration into the core MedisSPIP functionality will be considered.
    You can use the development discussion list to request for help with creating a plugin. As MediaSPIP is based on SPIP - or you can use the SPIP discussion list SPIP-Zone.

  • Creating farms of unique websites

    13 avril 2011, par

    MediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
    This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)

Sur d’autres sites (9637)

  • How to de-warp 180 degree or 360 degree fisheye video with ffmpeg ?

    31 juillet 2021, par John Allard

    Let's say I have video from an IP-camera that has a 180 degree or 360 degree fisheye lens and I want to dewarp the image in some way. Ideally I would be able to select some rectangular area of the input image and dewarp that into a "normal" looking output video, but it would also be acceptable to dewarp the the video into some sort of Equirectangular or Equi-Angular Cubemap projection. The input video looks like this

    



    enter image description here

    



    I'm aware of two filters that might be used for this

    



      


    1. lenscorrect filter - I think that this is on the right course but all of the example that I can find with this filter are only for "minor" fisheye lenses and I can't seem to get this to work correctly for videos with 360 degree fisheye lenses, it simply doesn't dewarp enough.

      2. 


    2. v360 filter. I thought that this must be the correctly filter but it seems that it's intended for 360 videos and not 360 degree fisheye lenses ? I didn't know that there was a difference but I can't get it to work. When I try to take my input video and map it through an equirectangular projection I get some odd output like this

      3. 


    



    enter image description here

    



    I've tried a dozen or so different combinations of parameters but none of them seem to give me the output that I want which is a single dewarped image. Can someone help me with the filter graph parameters to use this filter ?

    



    Is there something that I'm missing ? Are either of these filters the correct way forward ?

    



    EDIT -

    



    I've been experimenting with the v360 filter and I think I've gotten closer. What I want to do is map a fisheye input to an equirectangular output, so I've tried this

    



    ffmpeg -i input.mp4 -vf v360=fisheye:equirect:id_fov=360 output.mp4

    



    This should mean that my input is a fisheye lens with a diagonal field of view of 360 degrees and I want my output to be an equirectangular projection but this is what I get

    



    enter image description here

    


  • avfilter/vidstabtransform : use AV_OPT_TYPE_BOOL for tripod and debug options

    9 septembre 2015, par Clément Bœsch
    avfilter/vidstabtransform : use AV_OPT_TYPE_BOOL for tripod and debug options
    • [DH] libavfilter/vf_vidstabtransform.c

  • Revision 09faceb706 : Fix 2x scaling bug Reported by Alexander Voronov Change-Id : I463ba323cc9f4e345

    12 septembre 2014, par Deb Mukherjee

    Changed Paths :
     Modify /vp9/common/vp9_reconinter.c



    Fix 2x scaling bug

    Reported by Alexander Voronov

    Change-Id : I463ba323cc9f4e345b7e6f759565725737793086

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