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Autres articles (102)

  • 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 (...)

  • Qu’est ce qu’un éditorial

    21 juin 2013, par

    Ecrivez votre de point de vue dans un article. Celui-ci sera rangé dans une rubrique prévue à cet effet.
    Un éditorial est un article de type texte uniquement. Il a pour objectif de ranger les points de vue dans une rubrique dédiée. Un seul éditorial est placé à la une en page d’accueil. Pour consulter les précédents, consultez la rubrique dédiée.
    Vous pouvez personnaliser le formulaire de création d’un éditorial.
    Formulaire de création d’un éditorial Dans le cas d’un document de type éditorial, les (...)

  • 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 (...)

Sur d’autres sites (13097)

  • GOP size for realtime video stream

    7 janvier 2017, par MadMass

    I’m working on a kind of rich remote desktop system, with a video stream of the desktop encoded using avcodec/x264. I have to set manually the GOP size for the stream, and so far I was using a size of fps/2.
    But I’ve just read the following on Wikipedia :

    This structure [Group Of Picture@ suggests a problem because the fourth frame (a P-frame) is needed in order to predict the second and the third (B-frames). So we need to transmit the P-frame before the B-frames and it will delay the transmission (it will be necessary to keep the P-frame).

    It means I’m creating a lot of latency since the client needs to receive at least half of the GOP to output the first frame following the I frame. What is the best strategy for the GOP size if I want the smallest latency possible ? A gop of 1 picture ?

  • Changing volume halfway through video using FFmpeg ?

    10 avril 2019, par Essem

    I’m trying to use the fluent-ffmpeg NPM module in an application to decrease the volume of the audio in the first half of a video, then increase the volume when it reaches the midway point. I’ve wrote this code to try to do that :

    const ffmpeg = require("fluent-ffmpeg");
    

    
ffmpeg("test.mp4")
    
 .audioFilters("volume=enable='between(t,0,t/2)':volume='0.25'", "volume=enable='between(t,t/2,t)':volume='1'")
    
 .save("output.mp4");

    However, whenever I run this code, the volume levels of output.mp4 are exactly the same as test.mp4. What do I do ?

  • Is it possible to change volume with no reencode with ffmpeg ?

    30 juin 2023, par John Smith

    I just had this question because I used the following command with ffmpeg :

    



    ffmpeg -i input.wav -filter:a "volume=0.2" output.wav


    



    Following the documentation here : https://trac.ffmpeg.org/wiki/AudioVolume

    



    However, when I created the new file, the output was half the size of the input and the bitrate of the audio track was reduced as well.

    



    So my questions are :

    



      

    1. Is the bitrate supposed to decrease with decreasing and increasing volume like so ?

      2. 


    2. Is it possible to change volume without reencoding with ffmpeg ?

      3. 


    


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