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  • MediaSPIP 0.1 Beta version

    25 avril 2011, par

    MediaSPIP 0.1 beta is the first version of MediaSPIP proclaimed as "usable".
    The zip file provided here only contains the sources of MediaSPIP in its standalone version.
    To get a working installation, you must manually install all-software dependencies on the server.
    If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...)

  • Selection of projects using MediaSPIP

    2 mai 2011, par

    The examples below are representative elements of MediaSPIP specific uses for specific projects.
    MediaSPIP farm @ Infini
    The non profit organizationInfini develops hospitality activities, internet access point, training, realizing innovative projects in the field of information and communication technologies and Communication, and hosting of websites. It plays a unique and prominent role in the Brest (France) area, at the national level, among the half-dozen such association. Its members (...)

  • Sélection de projets utilisant MediaSPIP

    29 avril 2011, par

    Les exemples cités ci-dessous sont des éléments représentatifs d’usages spécifiques de MediaSPIP pour certains projets.
    Vous pensez avoir un site "remarquable" réalisé avec MediaSPIP ? Faites le nous savoir ici.
    Ferme MediaSPIP @ Infini
    L’Association Infini développe des activités d’accueil, de point d’accès internet, de formation, de conduite de projets innovants dans le domaine des Technologies de l’Information et de la Communication, et l’hébergement de sites. Elle joue en la matière un rôle unique (...)

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  • ffmpeg capturing video with incorrect colors

    13 janvier 2020, par Nilson Lagos

    I’ve trying to capture a video on my linux server of some test executions but the colors are messed up, I’m using the following command :

    ffmpeg -f x11grab -video_size 1280x1024 -i :99 -codec:v libx264 -r 12

    been triying with different alternatives :

    -r 25  -color_primaries smpte170m -color_trc smpte170m -colorspace smpte170m  

    image

  • jpg : fix colors for sequential RGB

    18 mars 2012, par Carl Eugen Hoyos

    jpg : fix colors for sequential RGB

  • Colors messed up when converting an image sequence to video using ffmpeg

    10 février 2024, par Form

    I'm generating a video from a PNG sequence using ffmpeg but the resulting video has wrong colors compared to the source files. Getting the correct colors is important because we're using our video assets side-by-side with image assets and the colors must match perfectly (or at least, be as visually similar as possible so as not to be jarring).

    


    Our PNG input files are in the sRGB color profile.

    


    Here's the command we're running :

    


    ffmpeg -r 30 -f image2 -s 1920x1080 -i bg_analyse_%05d.png -vcodec libx264 -crf 25 -pix_fmt yuv420p output5.mp4


    


    And here's a comparison of a source PNG (left) and the same frame in the video (right) :

    


    enter image description here

    


    From what we've gathered, H.264 does not support sRGB as a built-in color profile so I suppose ffmpeg must perform some kind of color conversion. However, the default ffmpeg settings seem to get the conversion wrong.

    


    How can I get ffmpeg to export a video with colors as close visually as our PNG source files in the native H.264 color profile ? I've tried various flags to try and specify input color profiles and more but nothing produced the expected results yet.

    


    I didn't see many mention color profiles when it comes to generating videos from PNG sequences using ffmpeg. Must be because most aren't too picky on the output colors or simply don't notice ? When putting our source assets with the video output side-by-side in our app, however, the difference is clear.

    


    I already tried playing the video file in multiple players to make sure it's not a display issue (QuickTime Player X, Chrome, etc.). The video is exactly the same (lighter than the source PNGs) in all players.

    


    


    Edit 1 :

    


    In the end, the image and video will be displayed in Electron (Chromium). If that changes anything to how the video should be generated.

    


    


    Edit 2 :

    


    We have an AfterEffects project from which the files are exported. We couldn't find any way to have that output correct colors so we hoped that using ffmpeg with a sequence of PNGs (which AE exports correctly) would give us more control over the final colors. Open to ideas on how to manage colors properly in AE, too.

    


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