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  • Mise à jour de la version 0.1 vers 0.2

    24 juin 2013, par

    Explications des différents changements notables lors du passage de la version 0.1 de MediaSPIP à la version 0.3. Quelles sont les nouveautés
    Au niveau des dépendances logicielles Utilisation des dernières versions de FFMpeg (>= v1.2.1) ; Installation des dépendances pour Smush ; Installation de MediaInfo et FFprobe pour la récupération des métadonnées ; On n’utilise plus ffmpeg2theora ; On n’installe plus flvtool2 au profit de flvtool++ ; On n’installe plus ffmpeg-php qui n’est plus maintenu au (...)

  • Personnaliser en ajoutant son logo, sa bannière ou son image de fond

    5 septembre 2013, par

    Certains thèmes prennent en compte trois éléments de personnalisation : l’ajout d’un logo ; l’ajout d’une bannière l’ajout d’une image de fond ;

  • Ecrire une actualité

    21 juin 2013, par

    Présentez les changements dans votre MédiaSPIP ou les actualités de vos projets sur votre MédiaSPIP grâce à la rubrique actualités.
    Dans le thème par défaut spipeo de MédiaSPIP, les actualités sont affichées en bas de la page principale sous les éditoriaux.
    Vous pouvez personnaliser le formulaire de création d’une actualité.
    Formulaire de création d’une actualité Dans le cas d’un document de type actualité, les champs proposés par défaut sont : Date de publication ( personnaliser la date de publication ) (...)

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  • Removing lagspikes in video with using mpdecimate in FFmpeg

    2 novembre 2020, par Stratos2 - no videos here

    I frequently deal with .mp4 footage files which are game recordings from my computer. Because I'm dealing with a laggy game I end up with footage that has both duplicate frames and a variable frame rate. I want to cut out lagspikes from my video, lagspikes that can have the form of variable frame rates and/or duplicate frames. The end goal is to have video with a constant frame rate and no more lagspikes.
I'm well aware that this will destroy or at least damage the audio, but keeping the audio intact is not necessary for my application.

    


    I have come across the mpdecimate filter for FFmpeg. As far as I have seen this is able to remove duplicate frames, however it does this in a way that does not make the output file a shorter video, but it introduces more variable frame rate.

    


    Is it possible to reach my goal with FFmpeg ? And if so, how ?

    


    Thanks in advance for help !

    


  • Removing lagspikes in videos using mpdecimate in FFmpeg

    4 novembre 2020, par Stratos2 - no videos here

    I frequently deal with .mp4 footage files which are game recordings from my computer. Because I'm dealing with a laggy game I end up with footage that has both duplicate frames and a variable frame rate. I want to cut out lagspikes from my video, lagspikes that can have the form of variable frame rates and/or duplicate frames. The end goal is to have video with a constant frame rate and no more lagspikes.
I'm well aware that this will destroy or at least damage the audio, but keeping the audio intact is not necessary for my application.

    


    I have come across the mpdecimate filter for FFmpeg. As far as I have seen this is able to remove duplicate frames, however it does this in a way that does not make the output file a shorter video, but it introduces more variable frame rate.

    


    Is it possible to reach my goal with FFmpeg ? And if so, how ?

    


    Thanks in advance for help !

    


  • Trying to capture display output for real-time analysis with OpenCV ; I need help with interfacing with the OS for input

    26 juillet 2024, par mirari

    I want to apply operations from the OpenCV computer vision library, in real time, to video captured from my computer display.
The idea in this particular case is to detect interesting features during gameplay in a popular game and provide the user with an enhanced experience ; but I could think of several other scenarios where one would want to have live access to this data as well. 
At any rate, for the development phase it might be acceptable using canned video, but for the final application performance and responsiveness are obviously critical.

    



    I am trying to do this on Ubuntu 10.10 as of now, and would prefer to use a UNIX-like system, but any options are of interest.
My C skills are very limited, so whenever talking to OpenCV through Python is possible, I try to use that instead.
Please note that I am trying to capture NOT from a camera device, but from a live stream of display output ; and I'm at a loss as to how to take the input. As far as I can tell, CaptureFromCAM works only for camera devices, and it seems to me that the requirement for real-time performance in the end result makes storage in file and reading back through CaptureFromFile a bad option.

    



    The most promising route I have found so far seems to be using ffmpeg with the x11grab option to capture from an X11 display ;
(e.g. the command
ffmpeg -f x11grab -sameq -r 25 -s wxga -i :0.0 out.mpg
captures 1366x768 of display 0 to 'out.mpg').
I imagine it should be possible to treat the output stream from ffmpeg as a file to be read by OpenCV (presumably by using the CaptureFromFile function) maybe by using pipes ; but this is all on a much higher level than I have ever dealt with before and I could really use some directions. 
Do you think this approach is feasible ? And more importantly can you think of a better one ? How would you do it ?

    


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