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  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

  • 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 (...)

  • 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 (4968)

  • given a list of mp4, generate fmp4 and concatenate

    6 août 2021, par onion

    my input is a list of mp4 (for example each one is 10s), each mp4 will have correct timestamp, for example the second mp4 represents from 10s - 20s data.

    


    To simulate my input, I generate a list of mp4 this way

    


    ffmpeg -i ../origin-long-video.mp4 -map 0 -c copy -f segment -segment_time 10 -force_key_frames "expr:gte(t,n_forced*2)" -reset_timestamps 0 videos/output_%03d.mp4


    


    Note I use reset_timestamps 0 so that the timestamp is preserved.

    


    Then I convert each mp4 to fragment mp4 by using

    


    ffmpeg -y   -i videos/output_001.mp4   -force_key_frames "expr:gte(t,n_forced*2)"   -sc_threshold 0   -s 1280x720   -c:v libx264 -b:v 1500k   -c:a copy   -hls_time 100   -hls_playlist_type vod   -hls_segment_type fmp4   -hls_segment_filename "hls1/file%d.m4s"  -copyts hls1/index.m3u8


    


    The above cmd is for the first mp4 file, i did same operation for other mp4 in the list.
Note I used a large hls_time so that each mp4 will result in one fmp4, and also I use copyts to preserve the timestamp.

    


    Then I want to concatenate for example the 2nd and the 3rd fmp4 to generate one mp4, I used

    


    cat init.mp4 > rs.mp4
cat 2nd fmp4 >> rs.mp4
cat 3rd fmp4 >> rs.mp4


    


    However when trying to play the generated rs.mp4, it is 20s black screen then 10s video (corresponding to the 3rd mp4).

    


    I tried another approach which just generated a list of fmp4 directly like this :

    


    ffmpeg -y   -i ../origin-long-video.mp4   -force_key_frames "expr:gte(t,n_forced*2)"   -sc_threshold 0   -s 1280x720   -c:v libx264 -b:v 1500k   -c:a copy   -hls_time 10   -hls_playlist_type vod   -hls_segment_type fmp4   -hls_segment_filename "videos/file%d.m4s"   videos/index.m3u8


    


    And then if I concatenate the 2nd and 3rd generated fmp4 use the same way above, the result mp4 plays well.

    


    I wonder what is the difference between the generated fragment mp4 of the two approach so that they leads to different behavior when concatenation. Thank you !

    


  • ffmpeg : Convert gif to video

    7 décembre 2016, par Aminesrine

    I want to convert a gif file to a video with ffmpeg.
    I’m using :

    ffmpeg -y -i /gif/583fd7661b46d.gif -strict -2 -an -b:v 32M /gif/mp4/583fd7661b46d.avi

    The duration of my gif in photoshop is 27 seconds, but the duration of the video "583fd7661b46d.avi" generated is 15 seconds.
    How can I get the same duration of my gif in the video generated ?

    I execute this :

    ffplay file.gif

    It steel read without stoping and the "M-V" is incremented
    enter image description here

  • FFmpeg : high quality animated GIF ?

    19 février, par David Hope

    I'm generating animated a GIF from a video on my server.

    



    The generated GIF is not really high quality and it looks like the pixels are huge.

    



    Example :

    



    example GIF

    



    This is how I generate the GIF :

    



    shell_exec("/usr/bin/ffmpeg -i video.mkv -vf scale=500:-1 -t 10 -r 10 image.gif");


    



    I did a search on Google and came across this :

    



    shell_exec("/usr/bin/ffmpeg -i video.mkv -r 20 -f image2pipe -vcodec ppm - | convert -delay 5 - output.gif");


    



    But the command above doesn't do anything and no output.gif is being generated at all.

    



    There are some tutorials that I came across but none of them worked for me and some of them involve using ImageMagick which I dont have access to.

    



    Could someone please let me know if there is a clear way to generate a high-quality GIF using FFmpeg ?

    


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