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  • 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 (...)

  • Multilang : améliorer l’interface pour les blocs multilingues

    18 février 2011, par

    Multilang est un plugin supplémentaire qui n’est pas activé par défaut lors de l’initialisation de MediaSPIP.
    Après son activation, une préconfiguration est mise en place automatiquement par MediaSPIP init permettant à la nouvelle fonctionnalité d’être automatiquement opérationnelle. Il n’est donc pas obligatoire de passer par une étape de configuration pour cela.

  • 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 (...)

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  • Ffmpeg : Improve results with h264_nvenc video codec

    7 avril 2024, par Sulli

    I was very happy to discover ffmpeg is compatible with Cuda as using a GPU speeds up my processing time by 10 at least. But I was very sad to discover codec libx264 can’t be used and h264_nvenc is of much poorer quality (my videos are visibly pixelated, to the point I actually don’t see why ffmpeg was made compatible with Cuda in the first place :) ).

    


    I did not tweak my ffmpeg commands at all when I switched from libx264 to h264_nvenc, but maybe there are some parameters I could add to get a better quality ? Even if it leads to longer processing time, I don’t mind trading a bit of that for a better quality. Or maybe another video codec I wouldn’t know about ?

    


    I usually run my scripts on Google Colab if that matters (tesla T4 graphics card, Driver Version : 535.104.05, CUDA Version : 12.2)

    


  • lavc/qsv_hevc : correct QSV HEVC default plugin on Windows

    12 décembre 2018, par Zhong Li
    lavc/qsv_hevc : correct QSV HEVC default plugin on Windows

    1. Old logic meaned : everywhere, except Windows, ffmpeg has to use HW
    
acceleration, but on Windows ffmpeg has to use (unavailable) software
    
HEVC by default
    
2. Software HEVC is available only if you provide corresponding
    
software MediaSDK library, which isn't provided with ffmpeg. More
    
information could be found in
    
https://github.com/Intel-Media-SDK/MediaSDK/blob/master/doc/samples/readme-encode_linux.pdf
    
3. HW HEVC decoding/encoding are available on Windows in the driver by default
    

    Note : Default case should be the most common case but this change still has potential risk
    
on windows if HW path is not supported(or doesn't work as expection).
    
(See the historical disscution : https://lists.libav.org/pipermail/libav-devel/2016-November/080419.html).
    
In such case, two options suggested :
    
1. Use the option "-load_plugin hevc_sw" to switch SW path manually.
    
2. Or report bug to Intel windows driver if your GPU can support HEVC HW codec.
    
  (HEVC decoding is supported since Braswell, and encoding supported since Skylake)
    

    Patch started by Landgraph. Add similar change for hevc decoder and bump a new version.
    

    Reviewed-by : Mark Thompson <sw@jkqxz.net>
    
Reviewed-by : Maxym Dmytrychenko <maxim.d33@gmail.com>
    
Signed-off-by : Landgraph <me@landgraph.ru>
    
Signed-off-by : Zhong Li <zhong.li@intel.com>
    • [DH] libavcodec/qsvdec_h2645.c
    • [DH] libavcodec/qsvenc_hevc.c
    • [DH] libavcodec/version.h

  • ffmpeg fails to capture video running on screen

    21 septembre 2014, par Ralf

    I’m trying to capture a slide presentation as video. I’m using the following command to capture my screen

    ffmpeg \
    
   -f x11grab -s 1024x768 -r 25 -i $DISPLAY \
    
   -f alsa -i pulse \
    
   -vcodec libx264 -preset ultrafast -vb 1000k \
    
   -acodec libmp3lame -ab 128k \
    
   test.avi

    This works (application windows on the screen are visible and sound is recorded in test.avi), but the problem is : Any video shown on the screen (e.g. a youtube video running in a browser window, but also e.g. a video played by mplayer) only appears as an empty (e.g. green) box when I play the captured video (test.avi).

    I’m using ffmpeg version 0.8.16-4:0.8.16-0ubuntu0.12.04.1 on Ubuntu 12.04.5 LTS with the nvidia-331 driver (effect is the same with older nvidia-304).

    I would really appreciate any suggestions, thanks a lot !

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