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Autres articles (96)

  • 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 (...)

  • Installation en mode standalone

    4 février 2011, par

    L’installation de la distribution MediaSPIP se fait en plusieurs étapes : la récupération des fichiers nécessaires. À ce moment là deux méthodes sont possibles : en installant l’archive ZIP contenant l’ensemble de la distribution ; via SVN en récupérant les sources de chaque modules séparément ; la préconfiguration ; l’installation définitive ;
    [mediaspip_zip]Installation de l’archive ZIP de MediaSPIP
    Ce mode d’installation est la méthode la plus simple afin d’installer l’ensemble de la distribution (...)

  • Automated installation script of MediaSPIP

    25 avril 2011, par

    To overcome the difficulties mainly due to the installation of server side software dependencies, an "all-in-one" installation script written in bash was created to facilitate this step on a server with a compatible Linux distribution.
    You must have access to your server via SSH and a root account to use it, which will install the dependencies. Contact your provider if you do not have that.
    The documentation of the use of this installation script is available here.
    The code of this (...)

Sur d’autres sites (8994)

  • ffmpeg ssim gives me bad result for both high quality and bad quality compression

    7 mars 2021, par idoo

    I want to use ssim to evaluate the compression quality.
However, when I calculate the ssim values I get very similar (and low) results for very good lossless compression and for very bad.

    


    What do I do wrong ?

    


    For compression I do :

    


    ffmpeg -r 6 -y -i %005d.bmp+ -c:v libx264 -crf 1 x264_medium_crf_1.avi
ffmpeg -r 6 -y -i %005d.bmp+ -c:v libx264 -crf 51 x264_medium_crf_51.avi


    


    Ref by -crf 0 :

    


    ffmpeg -r 6 -y -i %005d.bmp+ -c:v libx264 -crf 0 ref.avi


    


    For ssim :

    


    ffmpeg -i x264_medium_crf_1.avi -i ref.avi -lavfi "ssim;[0:v][1:v]psnr" -f null -
ffmpeg -i x264_medium_crf_51.avi -i ref.avi -lavfi "ssim;[0:v][1:v]psnr" -f null -


    


    I get

    


    [Parsed_ssim_0 @ 000002aa1f6c2c40] SSIM Y:0.891869 (9.660499) U:0.955877 (13.553365) V:0.907188 (10.323956) All:0.918311 (10.878384)
[Parsed_ssim_0 @ 00000230980ecf00] SSIM Y:0.883053 (9.320127) U:0.956858 (13.650996) V:0.897236 (9.881609) All:0.912383 (10.574098)


    


  • mp3enc : Properly write bitrate value in XING header

    9 avril 2014, par Michael Niedermayer
    mp3enc : Properly write bitrate value in XING header

    Instead of using a fixed bitrate_idx, calculate a matching bitrate for
    
the XING header.
    

    Using a fixed bitrate_idx causes tools such as file(1) and mediainfo(1)
    
to report wrong bitrate and bitrate mode when using CBR.
    

    Bug-Id : https://bugs.debian.org/736088
    

    Signed-off-by : Luca Barbato <lu_zero@gentoo.org>
    • [DH] libavformat/mp3enc.c

  • How to sync two videos of different length

    26 août 2020, par Huhngut

    I got two video files. The first one has good resolution but the wrong language and the second one has bad resolution but the wished language. Both of the files got a few seconds of black screen at the beginning but these seconds are different. I got a lot of these files and the intro seems to be always of a different length so I can't say always remove 2 seconds of audio and 3 seconds of video and then merge them.

    &#xA;

    So I am wondering if there's some tool out there which s able to sync these files automatically.

    &#xA;

    But it won't be enough to simply search for two identical images and calculate the time distance because the resolution is different (might its possible to scale the better one down for comparison) but even in this case, the program has to evaluate if the image has enough detail for comparison so it won't compare 2 black images. It would be good if the program scales the images to 50x50 to save time while comparing

    &#xA;

    Does someone know any tool or has suggestions might even some python/java code for developing one. Any search suggestions or name ideas

    &#xA;

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