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Autres articles (104)

  • MediaSPIP 0.1 Beta version

    25 avril 2011, par

    MediaSPIP 0.1 beta is the first version of MediaSPIP proclaimed as "usable".
    The zip file provided here only contains the sources of MediaSPIP in its standalone version.
    To get a working installation, you must manually install all-software dependencies on the server.
    If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...)

  • Personnaliser en ajoutant son logo, sa bannière ou son image de fond

    5 septembre 2013, par

    Certains thèmes prennent en compte trois éléments de personnalisation : l’ajout d’un logo ; l’ajout d’une bannière l’ajout d’une image de fond ;

  • Ecrire une actualité

    21 juin 2013, par

    Présentez les changements dans votre MédiaSPIP ou les actualités de vos projets sur votre MédiaSPIP grâce à la rubrique actualités.
    Dans le thème par défaut spipeo de MédiaSPIP, les actualités sont affichées en bas de la page principale sous les éditoriaux.
    Vous pouvez personnaliser le formulaire de création d’une actualité.
    Formulaire de création d’une actualité Dans le cas d’un document de type actualité, les champs proposés par défaut sont : Date de publication ( personnaliser la date de publication ) (...)

Sur d’autres sites (11564)

  • Forcing custom H.264 intra-frames (keyframes) at encode-time ?

    1er juin 2017, par Henry Cooke

    I have a video sequence that I’d like to skip to specific frames at playback-time (my player is implemented using AVPlayer in iOS, but that’s incidental). Since these frames will fall at unpredictable intervals, I can’t use the standard "keyframe every N frames/seconds" functionality present in most video encoders. I do, however, know the target frames in advance.

    In order to do this skipping as efficiently as possible, I need to force the target frames to be i-frames at encode time. Ideally in some kind of GUI which would let me scrub to a frame, mark it as a keyframe, and then (re)encode my video.

    If such a tool isn’t available, I have the feeling this could probably be done by rolling a custom encoder with libavcodec, but I’d rather use a higher-level (and preferably scriptable) tool to do the job if a GUI isn’t possible. Is this the kind of task ffmpeg or mencoder can be bent to ?

    Does anybody have a technique for doing this ? Also, it’s entirely possible that this is an impossible task because of some fundamental ignorance I have of the h.264 codec. If so, please do put me right.

  • live streamming using ffmpeg for more than stream on the same time

    29 novembre 2016, par بسمة أمل

    I’m using this command to stream video in ffmpeg but when I stream more than 3 or 4 streams at the same time interruption happen although the process in my device doesn’t exceed 50%
    I tried to use ffmpeg lib for each stream but interruption still happened

    this is my command :

     ffmpeg -re -i test.mp4 -i logo.png -vcodec libx264 -pix_fmt yuv420p -vb 2000000 -g 60 
    
-vprofile main -acodec aac -ab 128000 -ar 48000 -ac 2 -vbsf h264_mp4toannexb 
    
-strict experimental -filter_complex "[0][1]overlay=0:0" 
    
-pass 1 -f mpegts udp://127.0.0.1:1234?pkt_size=1316

  • How to find the presentation time stamp of a given frame number for FFMPEG decoding ?

    21 août 2017, par Deepankar Arya

    I am using the C APIs of ffmpeg for some video processing. My aim is to extract the screen shot of a given frame number. I have understood that ffmpeg has an av_seek_frame function to seek to a given timestamp(expressed in appropriated base units of the video stream). I assume that I will have to goto to the most recent I frame for the given frame(using the AVSEEK_FLAG_BACKWARD flag) and read onwards untill I meet the required frame. For that I need to give a seek time stamp to the av_seek_frame function. My main issue is that given a frame number, how do I find an associated presentation time stamp to seek to ?

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