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  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

  • 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 ;

  • Creating farms of unique websites

    13 avril 2011, par

    MediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
    This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)

Sur d’autres sites (11250)

  • FFmpeg Fade in and out video multiple times

    26 mars 2020, par UsuallyHelpless

    I need to overlay a video multiple times. Let’s say that the overlay video is visible between 2-5 and 7-9 seconds with fading.

     :

    (Works) : Single fade in/out between 2-5 :

    ffmpeg -i background.mp4 -i overlay.mp4 -filter_complex "[1:v]fade=in:st=2:d=1,fade=out:st=4:d=1[ovrl];[0][ovrl]overlay" out.mp4

    (Doesn’t work) Double fade in/out between 2-5 and 7-9

    ffmpeg -i background.mp4 -i overlay.mp4 -filter_complex "[1:v]format=rgba,fade=in:st=2:d=1,fade=out:st=4:d=1,fade=in:st=7:d=1,fade=out:st=8:d=1[ovrl];[0][ovrl]overlay" out.mp4

    This makes the whole overlay video not appear at all. Not even in the first fade in/out.

     :

    Do I need to use the "enable(t,2,5)" ?

    Or is it possible I need to somehow use the "overlay=alpha=" filter option ?

  • matroskaenc : Validate chapter start and end times

    3 février 2015, par Vittorio Giovara
    matroskaenc : Validate chapter start and end times

    CC : libav-stable@libav.org
    
Bug-Id : CID 1265717
    • [DH] libavformat/matroskaenc.c

  • Insert keyframe into m4v/mp4 at specific times

    31 janvier 2024, par reynoldsnlp

    I have a program for educators (written with electronjs framework) that plays videos, skipping to preset points in the video as defined in a companion JSON file. Sometimes there is a significant lag after a skip, and this answer suggests that the lag is there because of infrequent keyframes.

    



    Assuming this is correct, I would like to insert keyframes at exact points in the mp4 file where I know the player will skip to. However, some of these video files are already quite large, so I do not want to decrease the keyframe interval, thereby making the files even larger. I only need to force a handful of keyframes in the entire file.

    



    I would like to be able to pass an argument (to ffmpeg, for example) with the times at which I want to force keyframes. Preferably, I would like to do this without re-encoding the entire video (just like this unanswered question), but if I have to reencode the video, I could do that too.

    


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