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Autres articles (34)

  • Des sites réalisés avec MediaSPIP

    2 mai 2011, par

    Cette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
    Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page.

  • List of compatible distributions

    26 avril 2011, par

    The table below is the list of Linux distributions compatible with the automated installation script of MediaSPIP. Distribution nameVersion nameVersion number Debian Squeeze 6.x.x Debian Weezy 7.x.x Debian Jessie 8.x.x Ubuntu The Precise Pangolin 12.04 LTS Ubuntu The Trusty Tahr 14.04
    If you want to help us improve this list, you can provide us access to a machine whose distribution is not mentioned above or send the necessary fixes to add (...)

  • Submit enhancements and plugins

    13 avril 2011

    If you have developed a new extension to add one or more useful features to MediaSPIP, let us know and its integration into the core MedisSPIP functionality will be considered.
    You can use the development discussion list to request for help with creating a plugin. As MediaSPIP is based on SPIP - or you can use the SPIP discussion list SPIP-Zone.

Sur d’autres sites (6704)

  • real time decoding of SHVC bit streams

    8 mai 2018, par userDtrm

    Does anyone know an open source decoder that can perform real time SHVC bit stream decoding ?. The openHEVC states that it has the capability to decode HEVC scalable bit streams, but I was not able to decode a SHVC bit stream generated by SHM 7.0 reference encoder.

    Also, does the ffmpeg support scalable extension of HEVC ?.

    Thanks.

  • How to decode video in ffmpeg in real time ?

    18 juillet 2021, par Guerlando OCs

    Basic ffmpeg decoding consists of avcodec_send_packet to send encoded packets and avcodec_receive_frame to receive the decoded frames.

    


    avcodec_send_packet returns EAGAIN in case it's full. That is, in case no one is calling avcodec_receive_frame.

    


    Suppose I'm reading an mp4 file and rendering on the screen. That is, I want real time playback of the video. One way to do that would be to tell the renderer the exact fps the file has, for example :

    


    If the file should play at 30 fps, then the renderer calls avcodec_receive_frame 30 times per second, and the avcodec_send_packet only sends new packets when it can. If it receives EAGAIN, it waits and sends again in 1 millisecond, instead of discarding the packet.

    


    Is this the right way to do ? Because getting the fps of the file is not trivial. At least I've never seen this in ffmpeg. Maybe a .mp4 file has this information, but what about a raw .h264 file ? VLC player can play raw .h264 in the right time, but I don't know how it does that

    


  • Are compression artifacts asymmetric in time ?

    15 mars 2020, par MaxB

    Suppose that an uncompressed movie was either

    • encoded (using H264)
    • decoded

    or

    • reversed
    • encoded (using H264)
    • decoded
    • reversed again

    Is it in principle possible to guess which procedure took place just by looking at the output (the uncompressed input is unavailable) ?

    In other words, are compression artifacts asymmetric in time ?

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