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Autres articles (43)

  • 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 (...)

  • 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.

  • 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 (6842)

  • Where the ffmpeg.exe is located in when downloading the archive ?

    19 décembre 2015, par Daniel Hamutel

    I went to the official site :

    ffmpeg

    I downloaded first the windows build version then i downloaded the ffmpeg-2.8.3.tar.bz2 file in both i didn’t find the exe.

  • FFMPEG video conversion

    10 février 2014, par user3292775

    I want to know what methods does the FFMPEG has. In the documentation provided on FFMPEG official site there is no information of the methods that can be used. Any help would be much appreciated.

  • What is the correct way to calculate SSIM ?

    19 mai 2023, par jamacoe

    On Windows 10, I have installed ImageMagick, Version 7.1.1-Q16-HDRI.

    


    I have a high resolution .png image that I convert to jpg with 75% quality :

    


    magick myImage.png -quality 75 myImage.jpeg


    


    Now I want to calculate SSIM to judge the quality of the .jpeg in comparison to the original .png.

    


    First, I am using ffmpeg.exe version 4.2.3 from the very same ImageMagick installation :

    


    ffmpeg.exe -i myImage.jpeg -i myImage.png -lavfi ssim=stats_file=ssim_logfile.txt -f null -


    


    Results in ssim_logfile.txt :

    


    n:1 Y:0.959684 U:0.957603 V:0.976335 All:0.962112 (14.215018)


    


    So I assume that the SSIM value has been calculated as 0.962112

    


    Now I'll use magick to calculate the same metric :

    


    magick myImage.jpeg myImage.png -metric SSIM -compare -format "%[distortion]" info:


    


    Output is :

    


    0.925167


    


    That's a huge difference ! So I think I'm making an error here with one or the other way.

    


    What is the correct way to calculate SSIM ?

    


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