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Autres articles (97)

  • Encoding and processing into web-friendly formats

    13 avril 2011, par

    MediaSPIP automatically converts uploaded files to internet-compatible formats.
    Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
    Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
    Where possible, text is analyzed in order to retrieve the data needed for search engine detection, and then exported as a series of image files.
    All uploaded files are stored online in their original format, so you can (...)

  • 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 (...)

  • Installation en mode standalone

    4 février 2011, par

    L’installation de la distribution MediaSPIP se fait en plusieurs étapes : la récupération des fichiers nécessaires. À ce moment là deux méthodes sont possibles : en installant l’archive ZIP contenant l’ensemble de la distribution ; via SVN en récupérant les sources de chaque modules séparément ; la préconfiguration ; l’installation définitive ;
    [mediaspip_zip]Installation de l’archive ZIP de MediaSPIP
    Ce mode d’installation est la méthode la plus simple afin d’installer l’ensemble de la distribution (...)

Sur d’autres sites (7583)

  • How to dump the H264/RTP stream to a file without losing time info ?

    3 février 2014, par Fernando Silveira

    I coded an application to receive RTP packets via TCP (no packets are lost) from a hardware camera and dump its H264 packets to a file so I could play the video using MPlayer or VLC. This is already working and I pretty much did the steps described here. The commands to play the video are mplayer -fps 24 -demuxer h264es foobar.h264 and vlc foobar.h264.

    The issue is now when I play the video. The camera changes the FPS frequently and because I drop the RTP info when writing the H264 file, the timestamp of each frame is lost. My question is : what do I have to do to fix the frame frequency ? Should I create empty/blank P-frames (if that is possible) ? If so, how would I do it ?

    Any solution using Linux compatible tools or libraries (like ffmpeg, libx264, libavcodec) using shell, C/C++ or Python is very much welcome.

    PS : I have almost no experience with video encoding and RTP.

  • How to dump the H264/RTP stream to a file without losing time info ?

    3 février 2014, par Fernando Silveira

    I coded an application to receive RTP packets via TCP (no packets are lost) from a hardware camera and dump its H264 packets to a file so I could play the video using MPlayer or VLC. This is already working and I pretty much did the steps described here. The commands to play the video are mplayer -fps 24 -demuxer h264es foobar.h264 and vlc foobar.h264.

    The issue is now when I play the video. The camera changes the FPS frequently and because I drop the RTP info when writing the H264 file, the timestamp of each frame is lost. My question is : what do I have to do to fix the frame frequency ? Should I create empty/blank P-frames (if that is possible) ? If so, how would I do it ?

    Any solution using Linux compatible tools or libraries (like ffmpeg, libx264, libavcodec) using shell, C/C++ or Python is very much welcome.

    PS : I have almost no experience with video encoding and RTP.

  • Cannot read xvid video with opencv in python on mac

    15 février 2017, par crazjo

    I have been trying for hours to read a xvid .avi file on my mac with python 2.7 and opencv. I have installed all the latest versions using brew and opencv is working in python and I can open images and other movie files but when I try to read a xvid avi file with

    cap.cv2.VideoCapture('video.AVI')
    
ret, frame = cap.read()

    It fails as frame is empty. I have installed ffmpeg with brew and x264 as well and ran brew doctor. I am totally lost what to do now. Happy to provide more information if needed. I hope someone can help me, thanks.

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