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  • 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 (...)

  • Des sites réalisés avec MediaSPIP

    2 mai 2011, par

    Cette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
    Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page.

  • Activation de l’inscription des visiteurs

    12 avril 2011, par

    Il est également possible d’activer l’inscription des visiteurs ce qui permettra à tout un chacun d’ouvrir soit même un compte sur le canal en question dans le cadre de projets ouverts par exemple.
    Pour ce faire, il suffit d’aller dans l’espace de configuration du site en choisissant le sous menus "Gestion des utilisateurs". Le premier formulaire visible correspond à cette fonctionnalité.
    Par défaut, MediaSPIP a créé lors de son initialisation un élément de menu dans le menu du haut de la page menant (...)

Sur d’autres sites (7248)

  • FFMPEG error when making animations with certain frame dimensions

    10 août 2018, par jtam

    I have been using ffmpeg to successfully generate animations of png images with a size of 7205x4308 with the following command :

    -framerate 25 -f image2 -start_number 1 -i fig%4d.png -f mp4 -vf scale=-2:ih -vcodec libx264 -pix_fmt yuv420p 2015-2018.mp4

    When I try to run the same command for a group of images with a different size, e.g., 6404x5575, I get the following error :

    Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
    
Conversion failed!

    I have concluded that the reason it is failing has something to do with the frame size because that is the only thing that is different between the first successful animation and the one that is failing. But, my intuition could be wrong(?). I have tried to remove the scaling parameter in the command but I get the same error.

    I am using ffmpeg version 3.4.2 on Mac OSX 10.13 via python.

    Any help would be much appreciated. Thanks !

  • Revision 37d7cb607e : Remove unnecessary local variables. Change-Id : I1cdcd847f258967534ef30ba15894b4

    5 février 2014, par Adrian Grange

    Changed Paths :
     Modify /vp9/vp9_cx_iface.c



    Remove unnecessary local variables.

    Change-Id : I1cdcd847f258967534ef30ba15894b486f1519a8

  • Making a video with opencv and ffmpeg. How to find the right color format ?

    17 mai 2024, par luc

    I have a webcam video recorder program built with python, opencv and ffmpeg

    



    It works ok except that the color of the video is more blue than the reality. The problem seems to come from color format of images.

    



    It seems that OpenCv is giving BGR images and ffmpeg+libx264 is expecting YUV420p. I've read that YUV420p correspond to YCbCr.

    



    opencv has no conversion from BGR to YCbCr. It only has a conversion to YCrCb.

    



    I have made some searchs and tried different alternatives to try converting opencv image to something that could be ok for ffmpeg+libx264. None is working. At this point, I am a bit lost and I would appreciate any pointer that could help me to fix this color issue.

    


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