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  • Emballe médias : à quoi cela sert ?

    4 février 2011, par

    Ce plugin vise à gérer des sites de mise en ligne de documents de tous types.
    Il crée des "médias", à savoir : un "média" est un article au sens SPIP créé automatiquement lors du téléversement d’un document qu’il soit audio, vidéo, image ou textuel ; un seul document ne peut être lié à un article dit "média" ;

  • Installation en mode ferme

    4 février 2011, par

    Le mode ferme permet d’héberger plusieurs sites de type MediaSPIP en n’installant qu’une seule fois son noyau fonctionnel.
    C’est la méthode que nous utilisons sur cette même plateforme.
    L’utilisation en mode ferme nécessite de connaïtre un peu le mécanisme de SPIP contrairement à la version standalone qui ne nécessite pas réellement de connaissances spécifique puisque l’espace privé habituel de SPIP n’est plus utilisé.
    Dans un premier temps, vous devez avoir installé les mêmes fichiers que l’installation (...)

  • Creating farms of unique websites

    13 avril 2011, par

    MediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
    This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)

Sur d’autres sites (4497)

  • Bitrate choice for h265 codec if CRF NOT Supported,MEDIA_CODEC [closed]

    5 septembre 2023, par strider

    How to choose optimal bitrate for encoding to a h265 codec, if h265 codec does NOT support any kind of CRF option ?

    


    I believe the codec supports variable bitrate.

    


    Is there an optimal ratio between bitrates of x264/XVID and h265 codecs ?
I.e. is there a general coefficient that I could multiply given x264 average bitrate to get h265 bitrate ?
(I guess we will have to assume a certain h265 preset here). Let the preset be medium or default for this question.

    


    Usually its for long-term storage and to reduce file size.

    


    Specifically I'm talking about hardware h265/HEVC MEDIA_CODEC for Android and FFMPEG. I'm just learning it, but it does not seem to have many options (does it support PRESET ?).
Any real life sample encoding FFMPEG command for hardware h265 MEDIA_CODEC with FFMPEG (e.g. for a movie) would be very helpful.

    


    Is there a reference table for h265 bitrates for common video formats like Bluray, etc ?

    


    Is there a way to output average video track bitrate with FFMPEG or other free tool ? (usually its x264 or mpeg2).

    


    Unfortunately there's no non-android device I currently have with hardware h265 encoding support or with a multicore CPU.

    


  • Broadcast Screen using ffmpeg to encode H.264

    29 avril 2018, par Erick Weil

    Background History :

    So. doing a program, I need a way to broadcast my desktop screen, trought local network( maybe wi-fi ), to aproximately 40 clients, primarily in windows, but if it also works in linux, will be great.

    Started doing my own video compression protocol, in Java, taking the hilbert curve as a inspiration ( it transmit 10 fps, 1024x720, horrible 8-bit colors, using 5 MB of bandwith) but the color quality was very low, and fps wasn’t that good, cpu usage blowing up to 50%, memory 800M. 

    So i realized i’ll never be able to do a proper encoding algorithm and tried to use ffmpeg to encode the screenshots in a video and transmit this.

    I tried :

    • Xuggler : not supported anymore, examples worked, but it does lack tutorials and things that explain how it works
    • VLCJ : VLC wraper for java, requires the client of the transmission to have VLC installed.
    • JavaCV : java wrapper of openCV, to wrap ffmpeg. my program size blows up if i include this
    • FFMPEG : in c++ i created a project, communication with java trought JNI, the remuxing example worked,
      but i don’t now how to use it to do what I want

    The actual question :

    How can i make a c++ program able to encode image frames into a H264 stream and send it trought UDP ?

    i mean, is there any tutorial on ffmpeg, any place to start learning how to use it.

  • How can I transform a sequence of images into a playable video using LibVLCSharp ?

    9 février 2021, par adamasan

    I have a sequence of images that I was able to extract from a video using LibVLCSharp. This sample to be more specific. I'm creating a small video library manager for learning purposes, and I would like to extract frames and create thumbnails to play when the user hovers the mouse over the previewer.

    


    Using the aforementioned sample I was able to create a WPF UI around the same loging and extract the frames from a video file. However what I want now is to convert these extracted frames into a video file, using them as preview for the video, just like happens on YouTube.

    


    I wasn't able, however, to find out how to achieve this using LibVLCSharp or just LibVLC. Using this answer on Super User I was able to achieve my goal and put those frames together into a video using ffmpeg.

    


    I haven't taken the time yet to study FFmpeg.Autogen, so I don't know if I would be able to extract the frames from the video files in the same way I can do with LibVLCSharp, but I don't see with good eyes using both libraries on my application, one to export the frames and one to generate these frames into a video.

    


    So, is there a way to get the output frames and convert them into a playable video using LibVLCSharp (or libvlc) itself ?

    


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