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  • 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.
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  • Librairies et logiciels spécifiques aux médias

    10 décembre 2010, par

    Pour un fonctionnement correct et optimal, plusieurs choses sont à prendre en considération.
    Il est important, après avoir installé apache2, mysql et php5, d’installer d’autres logiciels nécessaires dont les installations sont décrites dans les liens afférants. Un ensemble de librairies multimedias (x264, libtheora, libvpx) utilisées pour l’encodage et le décodage des vidéos et sons afin de supporter le plus grand nombre de fichiers possibles. Cf. : ce tutoriel ; FFMpeg avec le maximum de décodeurs et (...)

  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

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  • How to use FFmpeg Colorspace Options

    13 octobre 2024, par Matt McManis

    I'm trying to understand the difference between Colorspace FFmpeg arguments :

    


      

    • Normal option, -colorspace bt709

      • 


    • Number, -colorspace 1

      • 


    • Codec Params -x264-params "colorspace=bt709"

      • 


    • Filter -vf "colorspace=bt709"

      • 


    


    The Colorspace categories are :

    


      

    • all

      • 


    • iall

      • 


    • colorspace

      • 


    • transfer

      • 


    • primaries

      • 


    • color range

      • 


    • color matrix

      • 


    


    


    Question

    


    When should each be used when encoding from raw, or transcoding/converting from one format to another ? Such as mpg to mp4.

    


    Do I need to specify the input colorspace or will FFmpeg auto-detect ?

    


    


    Problems

    


    There is no -vp8-params, only -x264-params. Should I use normal options or -vf instead for vp8 and other codecs ?

    


    


    Errors

    


      


    • There are no Normal -all or -colormatrix options, but there are all= and colormatrix= for -x264-params and -vf.

      


      • 


    • With Codec Params -x264-params "colorspace=bt709", I get Error parsing option 'colorspace = bt709'.
      
However colorprim=bt709, transfer=bt709, colormatrix=bt709 all work.

      


      • 


    


    


    Resources

    


    https://ffmpeg.org/ffmpeg-filters.html#colormatrix
    
https://ffmpeg.org/ffmpeg-filters.html#colorspace
    
https://trac.ffmpeg.org/wiki/colorspace

    


  • Which pixel format for web mp4 video ?

    28 septembre 2015, par user606521

    I have to create video in mp4 format, and it seems that I can encode it with different pixel formats like yuv420p, yuv422p, yuvj422p. Which one I should use to maximize compatibility with most browsers/players ?

  • Which pixel format for web mp4 video ?

    27 février 2019, par user606521

    I have to create video in mp4 format, and it seems that I can encode it with different pixel formats like yuv420p, yuv422p, yuvj422p. Which one I should use to maximize compatibility with most browsers/players ?

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