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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 (...)

  • Amélioration de la version de base

    13 septembre 2013

    Jolie sélection multiple
    Le plugin Chosen permet d’améliorer l’ergonomie des champs de sélection multiple. Voir les deux images suivantes pour comparer.
    Il suffit pour cela d’activer le plugin Chosen (Configuration générale du site > Gestion des plugins), puis de configurer le plugin (Les squelettes > Chosen) en activant l’utilisation de Chosen dans le site public et en spécifiant les éléments de formulaires à améliorer, par exemple select[multiple] pour les listes à sélection multiple (...)

  • 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 ) (...)

Sur d’autres sites (10352)

  • Remove Static Pixels from a Video to Mimic a Green Screen Effect [closed]

    2 août 2021, par nKrkan

    I have a video that's 50 seconds in length, resolution of 480x480 and 16 frames per second.

    


    There is a person talking in it, with the background being static I thought if there's a way
    
to remove those static pixels (background) and just extract the moving pixels (foreground)
    
and possibly mimic a green screen effect ?

    


    I was thinking on writing a picture-by-picture comparison tool to do such thing but I don't
    
believe I'm up to the task, or maybe It's laziness.

    


    And now I know, some of you will point out that the video has compression artifacts and that
    
might cause some problems but It doesn't have to be Studio quality stuff.

    


    I tried the ffmpeg command from this question : Remove random background from video using ffmpeg or Python
    
And it does mask the person, but... I couldn't quite get it to work, apparently putting the
    
reference image in the input makes that image burned into the video, thus having no way to
    
remove it, but it did mask the background as black and the person as greenish, so still not a
    
viable way to do it.

    


    Have also tried some Python projects I've found on the GitHub but none of them worked as
    
I expected.

    


    So, what I thought to do is simply compare the first and the second frame of the video, check
    
all the pixels by comparing them with the two sources, and change those that stay within a
    
certain range of the initial pixel value.

    


    I should point out I'm not very knowledgeable with mathematics and the majority of the
    
methods used in these type of things, but perhaps someone could point me to an interesting
    
source to read and learn, or by providing an alternative to the methods aforementioned above.

    


  • FFmpeg - Rotating at angle

    23 septembre 2017, par connor

    I’ve been working through FFmpeg, but I have been unable to get a rotation to run from the examples they have on their site. I am trying to "wiggle" a video back and forth at a fixed point on the bottom - think a head moving left to right (and so on).

    I am attempting to do this with the filter "rotate" (https://ffmpeg.org/ffmpeg-filters.html#rotate). Attempting to use their examples, I get an error.

    This is what I have so far :

    ffmpeg -i vid1.mp4 -i vid2.mov -loop 1 -i image.png -filter_complex "\
       [2:v]alphaextract, scale=240x160[mask];\
       [0:v] scale=240x160, rotate=A*sin(2*PI/T*t) [ascaled];\
       [ascaled][mask]alphamerge[masked];\
       [1:v]scale=480x360[background];\
       [background][masked]overlay=120:20"\
       -c:a copy 65B6354F61B4AF02_HD_sq.MOV

    I am using "rotate" directly from an example in an attempt to get something to run at all.

    The error I get back is :

    [Parsed_rotate_3 @ 0x7ff4476045e0] [Eval @ 0x7fff5b3e3f00] Undefined constant or missing '(' in 'T*t)'
    [Parsed_rotate_3 @ 0x7ff4476045e0] Error occurred parsing angle expression 'A*sin(2*PI/T*t)'
    [Parsed_rotate_3 @ 0x7ff4476045e0] Failed to configure output pad on Parsed_rotate_3
    Error reinitializing filters!
    Failed to inject frame into filter network: Invalid argument
    Error while processing the decoded data for stream #1:0

    If I remove ’A’, ’T’, ’sin’, etc, rotate does actually work, but far from the desired behavior.

    Am I missing something to expose those params ?

  • iOS Recorded Video Playback on Android

    1er mars 2015, par Nirav

    I am trying to record video from iPhone device using UIImagePickerController and able to store it in MP4 format. The same video is uploaded on the Amazon S3 cloud.

    When I try to play the same video on Android devices, it fails to play with an error, cannot play.

    I searched forums/google and found that ffmpeg should be used to compress the video before uploading. I want to do the compression on the phone itself rather than on the server. Which is the best way to achieve this ?

    Regards,

    Nirav