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Autres articles (56)

  • 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 (...)

  • MediaSPIP v0.2

    21 juin 2013, par

    MediaSPIP 0.2 est la première version de MediaSPIP stable.
    Sa date de sortie officielle est le 21 juin 2013 et est annoncée ici.
    Le fichier zip ici présent contient uniquement les sources de MediaSPIP en version standalone.
    Comme pour la version précédente, il est nécessaire d’installer manuellement l’ensemble des dépendances logicielles sur le serveur.
    Si vous souhaitez utiliser cette archive pour une installation en mode ferme, il vous faudra également procéder à d’autres modifications (...)

  • Mise à disposition des fichiers

    14 avril 2011, par

    Par défaut, lors de son initialisation, MediaSPIP ne permet pas aux visiteurs de télécharger les fichiers qu’ils soient originaux ou le résultat de leur transformation ou encodage. Il permet uniquement de les visualiser.
    Cependant, il est possible et facile d’autoriser les visiteurs à avoir accès à ces documents et ce sous différentes formes.
    Tout cela se passe dans la page de configuration du squelette. Il vous faut aller dans l’espace d’administration du canal, et choisir dans la navigation (...)

Sur d’autres sites (5513)

  • Video editing : faded speedup/slowdown with free software

    25 octobre 2013, par Valio

    I would like to do "faded" speedups or slowdowns within videos.
    To illustrate what I mean here's a short clip of what I call "faded slowdown"

    So in a scene running at normal speed, there is a timeframe where the video slows down (or speeds up) and then runs again at normal speed. However the speed does not drop from 1 to e.g. 0.2 in a millisecond, but there's a smooth transition inbetween (I'm not certain if linear or not).

    I guess my video edtiting/cutting terminology is entirely flawed ; don't hesitate to correct it.

    1. Is anyone aware of a free software (*) video editor that offers such functionality ?
    2. Has anyone tried to implement it themself ? I guess it's not really that hard by using a script that generates necessary calls for ffmpeg or the like.

    over at least one second.
    the have one scene that runs at normal speed and at some point has a short slowdown or speedup. Basically we have one scene that gets
    I have not done any experiments yet, but
    If my terminology is confusing an exa

    (* as in free speech)

  • Streaming Kinect RGB and Depth Camera to ffserver

    25 avril 2017, par Dove Devic

    I am wanting to stream Kinect RGB and Depth camera data up to a AWS Server which is running ffserver and ffmpeg. I have the Kinect hooked up to a Windows machine, so this would preferably need to be done in .NET ; either C# or C++.

    My question :

    Its pretty trivial to gather the stream of the RGB Camera, and I don’t think it will too hard to send this up to the server, but getting the stream of the Depth Camera(the "greyscale" camera) is something I am having trouble with.

    I have looked around, and found this source on github, as well as this one, also on github, but I don’t think it is exactly what I need.

    Has anyone done this before, or knows how to even start about this ? Thanks !

    It seems that there are solutions, but not very clear ones.

  • ffmpeg, how to extract single frame, 0.5 seconds before the end ? [duplicate]

    24 avril 2020, par Tonny

    I've got a bunch (several 100) of videos (all different frame-rates and different lengths).
    
Each has an end-title during the last second of the video, that shows some important information I need to check.
    
Playing each video in a player, scrolling to the end and trying to pause it in the last second is just to cumbersome/time-consuming.
    
Grabbing a frame at that position and saving it as an image for each video lets me quickly check the info using the image-preview in my file-manager. Which is much more efficient.

    



    ffmpeg can capture single frames and write them to a jpg or png, but I am at a loss how to extract a frame in the middle of that title sequence. 0.5 seconds before the end of each video would be the sweet spot. (There is a animation effect during that 1 second sequence that makes the text in the video sometimes hard to read, but exactly in the middle the visibility is best.)
    
As far as I can tell ffmpeg can't use offsets "from the end", so I assume ffprobe is probably needed to analyze the video and on basis off that the correct ffmpeg command can be generated.

    



    I can handle the scripting around it to batch-process all the files.
    
Problem is that I'm very unfamiliar with video in general, ffmpeg and ffprobe in particular. I need some help to get started.
    
If someone can explain to me how to get from the full video 'clip.mp4' to the single frame 0.5 seconds before the end in 'clip_frame.jpg' I would be most grateful.

    


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