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Autres articles (41)

  • La file d’attente de SPIPmotion

    28 novembre 2010, par

    Une file d’attente stockée dans la base de donnée
    Lors de son installation, SPIPmotion crée une nouvelle table dans la base de donnée intitulée spip_spipmotion_attentes.
    Cette nouvelle table est constituée des champs suivants : id_spipmotion_attente, l’identifiant numérique unique de la tâche à traiter ; id_document, l’identifiant numérique du document original à encoder ; id_objet l’identifiant unique de l’objet auquel le document encodé devra être attaché automatiquement ; objet, le type d’objet auquel (...)

  • Contribute to documentation

    13 avril 2011

    Documentation is vital to the development of improved technical capabilities.
    MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
    To contribute, register to the project users’ mailing (...)

  • Récupération d’informations sur le site maître à l’installation d’une instance

    26 novembre 2010, par

    Utilité
    Sur le site principal, une instance de mutualisation est définie par plusieurs choses : Les données dans la table spip_mutus ; Son logo ; Son auteur principal (id_admin dans la table spip_mutus correspondant à un id_auteur de la table spip_auteurs)qui sera le seul à pouvoir créer définitivement l’instance de mutualisation ;
    Il peut donc être tout à fait judicieux de vouloir récupérer certaines de ces informations afin de compléter l’installation d’une instance pour, par exemple : récupérer le (...)

Sur d’autres sites (5326)

  • FFMPEG Wipe transition one layer over another

    25 juillet 2021, par Dan Weaver

    How to reveal one layer over another with a wipe transition using FFMPEG ?

    


    enter image description here

    


    NOTE : this is not a slide transition. The top image stays in one position but is gradually revealed over time.

    


    I'd like a technique that can work for top layers with or without transparency and for images, videos or dynamically created sources, like showwavespic.

    


    I tried making a mask animation like so :

    


    enter image description here

    


    but alphamerge doesn't work as I expected it to and I can't find a blend mode that works with this type of mask.

    


    EDIT : The xfade filter was suggested but it doesn't seem to work with when source has transparency. It renders transparent areas black. Example with transparent source :

    


    enter image description here

    


    But xfade renders this :

    


    enter image description here

    


  • How concat files URL of S3 using Lambda, Ffmpeg

    4 juillet 2021, par Tính Ngô Quang

    I am trying to concat webm files into 1 file, Then upload file new video to S3
Using S3, ffmpeg/lambda-layer

    


    import subprocess
import shlex
import boto3

def lambda_handler(event, context):
    ffmpeg_cmd = "ffmpeg -safe 0 -f matroska concat"
    ffmpeg_cmd += " -i https://s3demo.s3.ap-northeast-1.amazonaws.com/archives/input/record/mask/ep_1.webm"
    ffmpeg_cmd += " -i https://s3demo.s3.ap-northeast-1.amazonaws.com/archives/input/record/mask/ep_2.webm"
    ffmpeg_cmd += " -c:v copy -af aresample=async=1:first_pts=0 -"

    command1 = shlex.split(ffmpeg_cmd)
    p1 = subprocess.run(command1, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    print(p1.stdout)
    print(p1.stderr)
    # resp = s3_client.put_object(Body=p1.stdout, Bucket=s3_source_bucket, Key=s3_destination_filename2)


    


    I get error message :

    


    


    concat : Read-only file system

    


    


    According to the article below, using directory storage but still the same error.
https://stackoverflow.com/a/47323443/2949104

    


    ffmpeg_cmd += " -vcodec copy -acodec copy /tmp/output.webm -y"


    


  • Best library for video rendering [on hold]

    19 avril 2015, par galbarm

    I’m trying to rewrite the video rendering component in my application from scratch.

    Currently, it is using Direct3D of the the old managed DirectX 9.

    The video is originating from IP cameras and is being decoded using FFmpeg.

    The video is currently being be displayed within a UserControl inside the application. This is not supposed to change.

    Which libary should I choose to use for the rendering of the video ?

    Additional points :

    1. it is preferred that the rendering library will be .NET, but c++ is also optional.

    2. It should be optimized for displaying multiple videos simultaneously.
      This point is important. The application needs to display as many videos as possible from different IP cameras.

    3. It should be optimized for displaying camera video (it is not gaming video so that’s why I’m not sure DirectX is the natural option).

    4. It should support 64bit. Windows only.

    5. Bonus : it should integrate with FFmpeg in some way, to reduce development effort and maybe even increase performance.

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