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  • Gestion générale des documents

    13 mai 2011, par

    MédiaSPIP ne modifie jamais le document original mis en ligne.
    Pour chaque document mis en ligne il effectue deux opérations successives : la création d’une version supplémentaire qui peut être facilement consultée en ligne tout en laissant l’original téléchargeable dans le cas où le document original ne peut être lu dans un navigateur Internet ; la récupération des métadonnées du document original pour illustrer textuellement le fichier ;
    Les tableaux ci-dessous expliquent ce que peut faire MédiaSPIP (...)

  • Des sites réalisés avec MediaSPIP

    2 mai 2011, par

    Cette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
    Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page.

  • 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 (...)

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  • How to generate a video by looping an image and then concat with another very long video without re-encoding using ffmpeg ?

    23 mars 2021, par Linghao Chen

    I have an image and a very long video (1.5h).
Now I want to generate a heading video about 5 seconds by looping the image, and then concatenate it with the long video. Since the video is long, I don't want to re-encode the videos.
I have tried to generate the heading video using

    


    ffmpeg -loop 1 -i image.png -c:v libx264 -t 5 -pix_fmt yuv420p head.mp4


    


    and then

    


    ffmpeg -f concat -i list.txt -c:v copy concat.mp4


    


    where the list.txt contains

    


    file head.mp4
file longvideo.mp4


    


    I have tried these operations on two machines.
On one machine, the concatenated video has no audio. Moreover, it stucks at 5-10 seconds and directly jump to 11s.
On the other machine, the video and audio are not synchronized.

    


    To provide more information, I have checked the codecs of the two videos by

    


    ffprobe -v error -select_streams v:0 -show_entries stream=codec_name \
  -of default=noprint_wrappers=1:nokey=1 xxxxx.mp4


    


    Both of them are h264.

    


    My question is, how to generate it correctly with ffmpeg ? If it is hard using ffmpeg, is there any method to do it fast ? As far as I know, Adobe Premiere and Final Cut Pro do not export as fast as I expect because they re-encode the videos.

    


  • ffmpeg encoded video has video/audio sync delay when uploading to Facebook & WhatsApp

    13 décembre 2019, par royherma
        "fluent-ffmpeg": "^2.1.2",
    
    "ffmpeg": "^0.0.4",
    
    node : 8

    Code to reproduce

    let command = ffmpeg()
    
        .input(tempFilePath)
    
        .input(watermarkFilePath)
    
        .complexFilter([
    
            "[0:v][1:v]overlay=W-w-20:H-h-20"
    
        ])
    
        .videoBitrate(2500)
    
        .videoCodec('libx264')
    
        .audioCodec('aac')
    
        .format('mp4')
    
        .output(targetTempFilePath)

    When applying the ffmpeg encoding command on the attached video, it plays fine on a local device - the issue however is when uploading to Facebook/WhatsApp the audio/video becomes out of sync

    Any ideas on what i need to change in terms of the video/audio settings so that the audio + video are in sync, even when uploaded to the various social networks ?

    Here’s a link to the 3 video files (original, post ffmpeg, post whatsapp upload that includes delay) if you want to get a better idea !

    https://wetransfer.com/downloads/445dfaf0f323a73c56201b818dc0267b20191213052112/24e635

    Thank you and appreciate any help !!

  • Using ffmpeg to cut up video into smaller video with exactly 30 frames

    30 mars 2018, par MonsieurBeilto

    I need to cut a video with >300 frames into ten videos, where the first video comprises the first 30 frames, the second video comprises frames from 31 to 60 and so on.

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