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Autres articles (35)

  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

  • Les images

    15 mai 2013

  • Taille des images et des logos définissables

    9 février 2011, par

    Dans beaucoup d’endroits du site, logos et images sont redimensionnées pour correspondre aux emplacements définis par les thèmes. L’ensemble des ces tailles pouvant changer d’un thème à un autre peuvent être définies directement dans le thème et éviter ainsi à l’utilisateur de devoir les configurer manuellement après avoir changé l’apparence de son site.
    Ces tailles d’images sont également disponibles dans la configuration spécifique de MediaSPIP Core. La taille maximale du logo du site en pixels, on permet (...)

Sur d’autres sites (2324)

  • 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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