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  • 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 (...)

  • 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 (...)

  • Script d’installation automatique de MediaSPIP

    25 avril 2011, par

    Afin de palier aux difficultés d’installation dues principalement aux dépendances logicielles coté serveur, un script d’installation "tout en un" en bash a été créé afin de faciliter cette étape sur un serveur doté d’une distribution Linux compatible.
    Vous devez bénéficier d’un accès SSH à votre serveur et d’un compte "root" afin de l’utiliser, ce qui permettra d’installer les dépendances. Contactez votre hébergeur si vous ne disposez pas de cela.
    La documentation de l’utilisation du script d’installation (...)

Sur d’autres sites (13659)

  • How can I generate HDR10 video from 16bit png images in browser using ffmpeg.wasm

    31 mars 2022, par Rajat Raghuwanshi

    Using FFMPEG.WASM I am able to generate video using libx264 encoder but unable to display the video generated using libx265. The image that I am using is the 16bit png image with linear gamma icc profile - AllColorsRGB-elle-V2-g10.icc. Here are the parameters that I used while encoding the hdr10 video.
    
-i abc.png -c:v libx265
    -x265-params hdr-opt=1:repeat-headers=1:colorprim=bt2020:transfer=smpte2084:colormatrix=bt2020nc:master-display=G(8500,39850)B(6550,2300)R(35400,14600)WP(15635,16450)L(40000000,50):max-cll=0,0
    -pix_fmt yuv420p10le out.mov

    


  • How to introduce artificial noise in the videos using ffmpeg ?

    17 juin 2021, par ashish14

    I am trying to introduce artificial noise in the videos so as to simulate real-world behaviour. The sources of noise I am currently considering are :

    


      

    1. Quality of video

        

      • Modifying video properties such as frame rate, resolution, bit rate, codecs and compression.

        • 


      


      2. 


    2. Recording Conditions

        

      • Factors such as lighting, brightness, contrast, darkness, blurriness, color etc.

        • 


      


      3. 


    


    So far I have tried changing the brightness to replicate different lighting settings. I used this command
ffplay -vf eq=gamma=1.5:brightness=0.3:saturation=20 P2_Frontal_3_A.MP4 to change the values of brightness.

    


    Questions :

    


      

    • Does modifying the brightness like above make sense to simulate different lighting conditions ?

      • 


    • What other properties should I change for blurriness, contrast and darkness ?

      • 


    


  • ffmpeg - adding white background to complex png command

    5 août 2022, par Uriel Romano

    I have a complex concatenation of commands working perfectly :

    


    ffmpeg -r 24 -i "D:\batches\S3025C-SV_"%%03d.png -vf "scale=out_color_matrix=bt709,eq=gamma=1:saturation=1,fps=25, crop=trunc(iw/2)*2:trunc(ih/2)*2" -color_primaries bt709 -color_trc bt709 -colorspace bt709 "D:\batches\S3025C-SV.mp4"

    


    Now I need to add a white background to this mp4 render, as ffmpeg is using a black one by default. I've found the following command here :

    


    -filter_complex "[0:v] setpts=PTS-STARTPTS [graphs]; [1:v][graphs] overlay=shortest=1 [out]" -map "[out]"

    


    How could I combine this operation into the first one ? I've tried a couple of different syntaxes but couldn't get it to work.

    


    Thanks for your help !

    


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