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Médias (91)

Autres articles (104)

  • Modifier la date de publication

    21 juin 2013, par

    Comment changer la date de publication d’un média ?
    Il faut au préalable rajouter un champ "Date de publication" dans le masque de formulaire adéquat :
    Administrer > Configuration des masques de formulaires > Sélectionner "Un média"
    Dans la rubrique "Champs à ajouter, cocher "Date de publication "
    Cliquer en bas de la page sur Enregistrer

  • Encoding and processing into web-friendly formats

    13 avril 2011, par

    MediaSPIP automatically converts uploaded files to internet-compatible formats.
    Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
    Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
    Where possible, text is analyzed in order to retrieve the data needed for search engine detection, and then exported as a series of image files.
    All uploaded files are stored online in their original format, so you can (...)

  • Formulaire personnalisable

    21 juin 2013, par

    Cette page présente les champs disponibles dans le formulaire de publication d’un média et il indique les différents champs qu’on peut ajouter. Formulaire de création d’un Media
    Dans le cas d’un document de type média, les champs proposés par défaut sont : Texte Activer/Désactiver le forum ( on peut désactiver l’invite au commentaire pour chaque article ) Licence Ajout/suppression d’auteurs Tags
    On peut modifier ce formulaire dans la partie :
    Administration > Configuration des masques de formulaire. (...)

Sur d’autres sites (8815)

  • screen recording and video encoding with ffmpeg

    2 septembre 2016, par Alexander M.

    1.we need to record screenshots into video with 2-3 fps. Quality - the minimum possible to make text on the screen readable, 256 colors. It is important to reduce the output video file size as much as possible.

    2.we’ve made a lot of tests, and currently the most suitable way is to make screenshots every 300-500msec, save them in PNG, then run ffmpeg to encode to H.267 with these params :

    ffmpeg -f image2 -i "C:\png5min\image%04d.png" -y -an -vcodec libx264 -preset veryfast -crf 30 "C:\output.mp4"

    3.is it the best way to get minimum output size with 2-3fps screencast ?

    4.the output file plays very quickly, codec by default concerns that images represent 25fps. But they are 2fps actually.
    Ok, but if we try to decrease the output frame rate, output file size increases for about twice !! (from 3mb to 6mb for a 3m:26s video). And if we set the output frame rate as 2 - video does not play frames at all or plays just 2 frames for 3mins... :

    -r 2 -f image2 -i "C:\png5min\image%04d.png" -y -an -vcodec libx264 -preset veryfast -crf 30 -r 2 "C:\image5min_2fps_crf30_test__R2-2.mp4"

    so, how can we just add some latency after each frame without increasing the output file size ???

  • screen recording and video encoding with ffmpeg

    2 septembre 2016, par Alexander M.

    1.we need to record screenshots into video with 2-3 fps. Quality - the minimum possible to make text on the screen readable, 256 colors. It is important to reduce the output video file size as much as possible.

    2.we’ve made a lot of tests, and currently the most suitable way is to make screenshots every 300-500msec, save them in PNG, then run ffmpeg to encode to H.267 with these params :

    ffmpeg -f image2 -i "C:\png5min\image%04d.png" -y -an -vcodec libx264 -preset veryfast -crf 30 "C:\output.mp4"

    3.is it the best way to get minimum output size with 2-3fps screencast ?

    4.the output file plays very quickly, codec by default concerns that images represent 25fps. But they are 2fps actually.
    Ok, but if we try to decrease the output frame rate, output file size increases for about twice !! (from 3mb to 6mb for a 3m:26s video). And if we set the output frame rate as 2 - video does not play frames at all or plays just 2 frames for 3mins... :

    -r 2 -f image2 -i "C:\png5min\image%04d.png" -y -an -vcodec libx264 -preset veryfast -crf 30 -r 2 "C:\image5min_2fps_crf30_test__R2-2.mp4"

    so, how can we just add some latency after each frame without increasing the output file size ???

  • kmsgrab : Use invalid modifier if modifiers weren't used.

    14 novembre 2020, par Bas Nieuwenhuizen
    kmsgrab : Use invalid modifier if modifiers weren't used.

    The kernel defaults to initializing the field to 0 when modifiers
    
are not used and this happens to be linear. If we end up actually
    
passing the modifier to a driver, tiling issues happen.
    

    So if the kernel doesn't return a modifier set it explicitly to
    
INVALID. That way later processing knows there is no explicit
    
modifier.
    

    Signed-off-by : Mark Thompson <sw@jkqxz.net>
    • [DH] libavdevice/kmsgrab.c

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