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  • Les tâches Cron régulières de la ferme

    1er décembre 2010, par

    La gestion de la ferme passe par l’exécution à intervalle régulier de plusieurs tâches répétitives dites Cron.
    Le super Cron (gestion_mutu_super_cron)
    Cette tâche, planifiée chaque minute, a pour simple effet d’appeler le Cron de l’ensemble des instances de la mutualisation régulièrement. Couplée avec un Cron système sur le site central de la mutualisation, cela permet de simplement générer des visites régulières sur les différents sites et éviter que les tâches des sites peu visités soient trop (...)

  • Contribute to documentation

    13 avril 2011

    Documentation is vital to the development of improved technical capabilities.
    MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
    To contribute, register to the project users’ mailing (...)

  • Ajouter notes et légendes aux images

    7 février 2011, par

    Pour pouvoir ajouter notes et légendes aux images, la première étape est d’installer le plugin "Légendes".
    Une fois le plugin activé, vous pouvez le configurer dans l’espace de configuration afin de modifier les droits de création / modification et de suppression des notes. Par défaut seuls les administrateurs du site peuvent ajouter des notes aux images.
    Modification lors de l’ajout d’un média
    Lors de l’ajout d’un média de type "image" un nouveau bouton apparait au dessus de la prévisualisation (...)

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  • Shifting audio in MPEG4 content and manipulating atoms

    10 janvier 2018, par LLL

    1. Shift audio

    I use ffmpeg / avconv quite often ... and usually I hate it.
    Those tools do what they are instructed to do about 30% of the time. I could give you countless examples but I don’t want to start flame war, so please help me with my current problem (really easy one).

    I wanted to shift audio (content is standard mp4 file with aac and h264 tracks), so I have found a "highly upvoted" solution :

    https://superuser.com/a/983153/758887

    the only problem with it is that it doesn’t work. I downloaded latest stable ffmpeg (even on windows as in the thread, so it’s version was 3.4.1) and executed command without changing literaly anything :

    ffmpeg.exe -i "movie.mp4" -itsoffset 3.84 -i "movie.mp4" -map 0:v -map 1:a -vcodec copy -acodec copy "movie-audio-delayed.mp4"

    Result was no shift (I expected audio to be 3.84s late).

    2. Remove MPEG4 atoms

    I would be also grateful if you could recommend some tool for removing MPEG4 boxes from content. For examining MPEG4 content I use MP4 Explorer / Codec Visa (limited) on Windows and AtomicParsley on Linux, however they only print atoms and I would like to edit / remove them. For example MP4Box can remove whole moov->track with "-rem" option but what if I would like to remove moov->track->edts only ?

  • How to integrate and use FFmpeg library in iOS with Xcode ?

    23 mars 2019, par Akshaykumar Maldhure

    I wanted to use FFMpeg library for video processing activities, from 2 days I m working on compiling and integrating this library with Xcode 8 and Swift. I tried following links but with no success. Can anyone please help me how to achieve this ?

    FFMPEG integration on iphone/ ipad project

    https://github.com/chrisballinger/FFmpeg-iOS

    http://witcheryne.iteye.com/blog/1734706

    How to Build FFMpeg as iOS Framework

    https://github.com/ElfSundae/FFmpeg-iOS-build

    https://github.com/kolyvan/kxmovie

  • How do I add a delay between a camera and a livestream using ffmpeg, since the -vf tpad=start_duration does actually delay the stream coming out ?

    12 août 2020, par Kenneth Ocheltree

    In trying to add a 10 second delay between a number of cameras and livestreams being fed into OBS, I wanted to be able to switch the stream before certain events occurred and the 10 second delay would allow that.

    


    I found that using a command of the form :

    


    ffmpeg -i input -vf tpad=start_duration=10 -af adelay=10000|10000 stream-out


    


    would insert 10 seconds of blank content at the beginning of the video stream, but that it would stream out all of the blank content in the first several seconds so that the outgoing livestream was effectively caught up with the incoming camera stream.

    


    Looking at the outgoing network traffic, I would see a burst of high network traffic when the stream starts sending the first 10 seconds of data and then the network traffic settles to the usual constant traffic level for the video stream.

    


    If I start watching the outgoing stream at the beginning, there is a 10 second delay in the stream. If I ever lose the stream and reconnect or start watching the stream after it was already running, the 10 second delay is no longer there.

    


    I am really trying to cause ffmpeg to delay the sending of the output stream in time, so that it is always buffering 10 seconds of data, and the -vf tpad=start_duration=10 -af adelay=10000|10000 commands do not do that.

    


    Is there another ffmpeg command that will force the actual output traffic of ffmpeg to stay delayed ?

    


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