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Autres articles (96)

  • 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 (...)

  • HTML5 audio and video support

    13 avril 2011, par

    MediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
    The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
    For older browsers the Flowplayer flash fallback is used.
    MediaSPIP allows for media playback on major mobile platforms with the above (...)

  • ANNEXE : Les plugins utilisés spécifiquement pour la ferme

    5 mars 2010, par

    Le site central/maître de la ferme a besoin d’utiliser plusieurs plugins supplémentaires vis à vis des canaux pour son bon fonctionnement. le plugin Gestion de la mutualisation ; le plugin inscription3 pour gérer les inscriptions et les demandes de création d’instance de mutualisation dès l’inscription des utilisateurs ; le plugin verifier qui fournit une API de vérification des champs (utilisé par inscription3) ; le plugin champs extras v2 nécessité par inscription3 (...)

Sur d’autres sites (5279)

  • FFMPEG rotate command show black color on edges

    11 décembre 2022, par Najih Zidan

    i am using command ffmpeg -i NoAudio.mp4 -i cat-face-emoji.png -filter_complex "[1]rotate=a=140[ov1];[0][ov1]overlay=480:270" -c:a copy output.mp4 -y to rotate image 140 degree but black background show on edges.

    


    Here output video : https://app.dadan.io/video/share/nmmU8uiyCl2YVYm4

    


    I am expecting to rotate image without any additional edges as the image in png.

    


  • imgutils : add function to clear an image to black

    22 juillet 2017, par wm4
    imgutils : add function to clear an image to black

    Black isn’t always just memset(ptr, 0, size). Limited YUV in particular
    
requires relatively non-obvious values, and filling a frame with
    
repeating 0 bytes is disallowed in some contexts. With component sizes
    
larger than 8 or packed YUV, this can become relatively complicated. So
    
having a generic function for this seems helpful.
    

    In order to handle the complex cases in a generic way without destroying
    
performance, this code attempts to compute a black pixel, and then uses
    
that value to clear the image data quickly by using a function like
    
memset.
    

    Common cases like yuv410p10 or rgba can’t be handled with a simple
    
memset, so there is some code to fill memory with 2/4/8 byte patterns.
    
For the remaining cases, a generic slow fallback is used.
    

    Signed-off-by : Anton Khirnov <anton@khirnov.net>
    • [DBH] doc/APIchanges
    • [DBH] libavutil/imgutils.c
    • [DBH] libavutil/imgutils.h
    • [DBH] libavutil/version.h

  • ffmpeg overlay filter adds black background for PNG with transparency

    30 janvier 2019, par Pavel S.

    I’m trying to programmatically add PNG overlay over h264 video.

    Even though PNG image has alpha channel, after I apply filter, on a resulting video this image has black background instead of transparent one.
    Here’s the filter :

    "[in][in2]overlay=15:15[out]"

    I’m using openh264 to decode/encode video, so the pixel format of resulting video is YUV420P.
    I’ve tried to explicitly define format in filter :

    [in][in2]overlay=15:15,format=rgba,format=yuv420p[out];

    But no change.
    ffmpeg : 3.4 ;
    openh264 : Git (i.e. 1.9.0)

    Thanks in advance.

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