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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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  • Variable is not being assingned value from the stdout of a command

    29 juillet 2021, par Jesse Hix

    When I try to run the entire program I get an error concerning the assignment of the y variable leading to the entire thing crashing. I have tried a few different ways of formatting but none of them have worked

    


    echo -e "Enter the name of the carrier video (include .mp4, .mp3, etc):"
read -r carrier_video
echo -e "Enter starting point x: "
read -r x
command rmdir frames
command mkdir frames

var=$(ffprobe -v error -select_streams v:0 -count_packets -show_entries stream=nb_read_packets -of csv=p=0 "$carrier__video")
command $(ffmpeg -i $carrier_video -vf select="between(n\,'$x'\,'$var')" -vsync 0 frames/frames%d.jpeg)


    


    Error :

    


     libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'original.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41isomavc1
    creation_time   : 2018-09-11T11:07:38.000000Z
  Duration: 00:00:21.12, start: 0.000000, bitrate: 21519 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 3840x2160, 21514 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2018-09-11T11:07:38.000000Z
      handler_name    : L-SMASH Video Handler
      encoder         : AVC Coding
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
Press [q] to stop, [?] for help

[Parsed_select_0 @ 0x5582453fdec0] [Eval @ 0x7ffedaf0ddb0] Undefined constant or missing '(' in ')'
[Parsed_select_0 @ 0x5582453fdec0] Error while parsing expression 'between(n,500,)'
[AVFilterGraph @ 0x5582453fd100] Error initializing filter 'select' with args 'between(n,500,)'
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
Conversion failed!



    


  • Optimize ffmpeg for text with mpeg1

    20 septembre 2022, par lmalves

    I'm kind of new to video enconding and decoding but I'm currently working with NodeJS and I need to stream the content of a window (using electron) to an angular app.

    


    In my current implementation I'm "grabbing" the app window content :

    


    ffmpeg -f gdigrab -i title="Windows App" -vcodec mpeg1video -r 30 -b:v 10  -bufsize:v 327680 -f rtp rtp://127.0.0.1:1234

    


    Then I'm conveting to http:

    


    ffmpeg -i rtp://127.0.0.1:1234 -protocol_whitelist file,crypto,udp,rtp,http,tcp -f mpegts -codec:v mpeg1video -s 500x515 -b:v 10 -bf 0 http://localhost:59655/

    


    And on the client app using MpegJS to display it with almost the default configuration.

    


    It works relativelly well except for some parts of text where if the font is smaller it's almost impossible to read it.

    


    Like I said I'm new on this and I'm not sure how to optimize it to text.
Any suggestions ?

    


  • Extract single frame based on position provided by subtitle/srt file and generate video of extracted stills

    22 décembre 2022, par lars.schwarz

    I'm looking into doing something that probably can't be done with simple ffmpeg cli commands :

    


      


    1. Extract single frames from video based on a provided srt file

      


      2. 


    2. Generate a new video (same length as the original) but generated from the still images extracted with 1.

      


      3. 


    


    Example :

    


    Video is 1 minute, srt file holds 2 subtitles at 00:00:15 and 00:00:25.

    


    Extract 2 stills/frames and save them as still_00_00_15.jpg and still_00_00_25.jpg

    


    Generate a new video that is 1 minute and only consits of these 2 images on their respective/original timestamps so the generated video of still images can be used with the original srt file.

    


    Is this something that can be achieved using just ffmpeg cli or should I build it using pyffmpeg ? More importantly : is there a name for this type of process and existing tools/libs for doing something like that or is this something so uncommong I need to build it myself anyway ?

    


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