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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 (...)

  • 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 (...)

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  • Is there a set of working P/Invoke declarations for FFMpeg, libavutil, libavformat and libavcodec in .NET ?

    11 février 2014, par casperOne

    I'm currently looking to access libavutil, libavformat and libavcodec (all part of FFMpeg) from .NET.

    Currently, I'm getting the libraries from the automated builds of the shared FFMpeg package performed every night for Windows 32-bit.

    I am also using the code from the ffmpeg-sharp project. In that project, I have removed a number of classes that were not compiling (they are wrapper classes not the P/Invoke declarations).

    The code compiles fine, but I am running into a few issues.

    First, it appears that the build of av*.dll uses the cdecl calling convention, as I was receiving a number of PInvokeStackImbalanceException when trying to call av_open_input_file. This was easy enough to change to get it to work right. The AVFormatContext structure is populated.

    After that, I want to call av_find_stream_info to get information about the streams in the file. However, when calling that with the AVFormatContext retrieved from the call to av_open_input_file, an AccessViolationException is thrown indicating that I am trying to read or write from protected memory.

    Has anyone used P/Invoke to access the libavutil, libavformat and libavcodec dll libraries through P/Invoke and have gotten it to work ?

    I should mention that working with the command-line version of FFMpeg, while a solution, is not a viable solution in this case, access needs to occur through the libraries. The reason for this is that I'd have to thrash the disk way too much to do what I need to do (I have to do a frame-by-frame analysis of some very high definition video) and I want to avoid the disk as much as possible.

  • Is there a set of working P/Invoke declarations for FFMpeg, libavutil, libavformat and libavcodec in .NET ?

    30 août 2011, par casperOne

    I'm currently looking to access libavutil, libavformat and libavcodec (all part of FFMpeg) from .NET.

    Currently, I'm getting the libraries from the automated builds of the shared FFMpeg package performed every night for Windows 32-bit.

    I am also using the code from the ffmpeg-sharp project. In that project, I have removed a number of classes that were not compiling (they are wrapper classes not the P/Invoke declarations).

    The code compiles fine, but I am running into a few issues.

    First, it appears that the build of av*.dll uses the cdecl calling convention, as I was receiving a number of PInvokeStackImbalanceException when trying to call av_open_input_file. This was easy enough to change to get it to work right. The AVFormatContext structure is populated.

    After that, I want to call av_find_stream_info to get information about the streams in the file. However, when calling that with the AVFormatContext retrieved from the call to av_open_input_file, an AccessViolationException is thrown indicating that I am trying to read or write from protected memory.

    Has anyone used P/Invoke to access the libavutil, libavformat and libavcodec dll libraries through P/Invoke and have gotten it to work ?

    I should mention that working with the command-line version of FFMpeg, while a solution, is not a viable solution in this case, access needs to occur through the libraries. The reason for this is that I'd have to thrash the disk way too much to do what I need to do (I have to do a frame-by-frame analysis of some very high definition video) and I want to avoid the disk as much as possible.

  • FFmpeg concat produces bad Video

    6 mars 2019, par Amorphis

    I have installed ffmpeg on a microsoft/dotnet:2.2-aspnetcore-runtime docker container using
    1.apt-get update
    2.apt-get install ffmpeg.

    seems to be installed fine, but when I try and use it as such
    ffmpeg -f concat -i /data/mylist.txt -c : copy /data/output.mp4

    the output is that the first video part is ok, but the second colors are all messy (hard to explain) and when I change the order of the videos in the list still the first in the list is ok and the second is messed up.

    p.s same settings on a different machine works (ffmpeg for ubuntu)

    bad

    [mov,mp4,m4a,3gp,3g2,mj2 @ 0x55ccbcce90c0] Auto-inserting h264_mp4toannexb bitstream filter
    
Input #0, concat, from '/data/mylist.txt':
    
  Duration: N/A, start: 0.000000, bitrate: 14915 kb/s
    
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 14915 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc
    
    Metadata:
    
      creation_time   : 2014-10-17T04:06:30.000000Z
    
      handler_name    : GPAC ISO Video Handler
    
Output #0, mp4, to '/data/output.mp4':
    
  Metadata:
    
    encoder         : Lavf57.56.101
    
    Stream #0:0(und): Video: h264 (Constrained Baseline) ([33][0][0][0] / 0x0021), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 14915 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 30k tbc
    
    Metadata:
    
      creation_time   : 2014-10-17T04:06:30.000000Z
    
      handler_name    : GPAC ISO Video Handler
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)

    good

    Input #0, concat, from '/data/mylist.txt':
    
  Duration: N/A, start: 0.000000, bitrate: 14915 kb/s
    
    Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 14915 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc
    
    Metadata:
    
      creation_time   : 2014-10-17T04:06:30.000000Z
    
      handler_name    : GPAC ISO Video Handler
    
Output #0, mp4, to '/data/outGood1.mp4':
    
  Metadata:
    
    encoder         : Lavf58.20.100
    
    Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 14915 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 30k tbc
    
    Metadata:
    
      creation_time   : 2014-10-17T04:06:30.000000Z
    
      handler_name    : GPAC ISO Video Handler
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)

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