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Autres articles (88)

  • Use, discuss, criticize

    13 avril 2011, par

    Talk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
    The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
    A discussion list is available for all exchanges between users.

  • Gestion des droits de création et d’édition des objets

    8 février 2011, par

    Par défaut, beaucoup de fonctionnalités sont limitées aux administrateurs mais restent configurables indépendamment pour modifier leur statut minimal d’utilisation notamment : la rédaction de contenus sur le site modifiables dans la gestion des templates de formulaires ; l’ajout de notes aux articles ; l’ajout de légendes et d’annotations sur les images ;

  • Le profil des utilisateurs

    12 avril 2011, par

    Chaque utilisateur dispose d’une page de profil lui permettant de modifier ses informations personnelle. Dans le menu de haut de page par défaut, un élément de menu est automatiquement créé à l’initialisation de MediaSPIP, visible uniquement si le visiteur est identifié sur le site.
    L’utilisateur a accès à la modification de profil depuis sa page auteur, un lien dans la navigation "Modifier votre profil" est (...)

Sur d’autres sites (9820)

  • What is the accurate way of calculating SSIM score (with ffmpeg) between a video stream and the reference video ?

    22 mars 2016, par krishna222

    As ffmpeg calculates ssim score by a frame-by-frame comparision,
    how do I exactly align the reference video (say ref.mp4) with the video stream, so that only the corresponding frames (ith frame of both the videos, for all i) are compared by ffmpeg ? Please help.

  • frame extracted from a video using opencv or ffmpeg is vague, picture i snip from video is clear

    15 avril 2024, par user11317826

    I record a video from roadside, and I want to recognize plate license in video. but I find that if I extract every frame from video using python, the frame is too vague to recognize.

    


    I have tried opencv and ffmpeg -i input.mp4 -ss 00:00:10.000 -vframes 1 output.png
`

    


    enter image description here

    


    but if I snip video every second the picture is clear

    


    enter image description here

    


    what's the reason of this phenomenon, how can I fix it

    


    I have tried frame average, it didn't work

    


  • How to replace the video track of a part of a video file ?

    17 juin 2019, par yukashima huksay

    I have an mp4 file like this(same format but longer) :

    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'N1.2.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: mp42mp41
    
    creation_time   : 2018-10-31T13:44:21.000000Z
    
  Duration: 00:28:54.21, start: 0.000000, bitrate: 10295 kb/s
    
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 9972 kb/s, 50 fps, 50 tbr, 50k tbn, 100 tbc (default)
    
    Metadata:
    
      creation_time   : 2018-10-31T13:44:21.000000Z
    
      handler_name    : ?Mainconcept Video Media Handler
    
      encoder         : AVC Coding
    
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
    
    Metadata:
    
      creation_time   : 2018-10-31T13:44:21.000000Z
    
      handler_name    : #Mainconcept MP4 Sound Media Handler

    I also have another video file that is 3 minutes long. and has no audio. What is the fastest way to encode the other video in a way that it is encoded like my main video and then replace the last three minutes of the video track of my original video with this ?

    In other words.
    I have video A that is 1 hour long. With the encoding shown above.

    I have video B that is 3 minutes long with no audio. with a random encoding.

    I want to have video C with the same encoding and same audio as A. But it’s video track would be the first 57 minutes of A + B(which is 3 minutes).

    I want to do this as fast as possible so I would like to not re encode A.

    I know how to concatenate two videos, I use this command :

    ffmpeg -f concat -i files.txt -c copy res.mp4

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