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  • Ajouter notes et légendes aux images

    7 février 2011, par

    Pour pouvoir ajouter notes et légendes aux images, la première étape est d’installer le plugin "Légendes".
    Une fois le plugin activé, vous pouvez le configurer dans l’espace de configuration afin de modifier les droits de création / modification et de suppression des notes. Par défaut seuls les administrateurs du site peuvent ajouter des notes aux images.
    Modification lors de l’ajout d’un média
    Lors de l’ajout d’un média de type "image" un nouveau bouton apparait au dessus de la prévisualisation (...)

  • Other interesting software

    13 avril 2011, par

    We don’t claim to be the only ones doing what we do ... and especially not to assert claims to be the best either ... What we do, we just try to do it well and getting better ...
    The following list represents softwares that tend to be more or less as MediaSPIP or that MediaSPIP tries more or less to do the same, whatever ...
    We don’t know them, we didn’t try them, but you can take a peek.
    Videopress
    Website : http://videopress.com/
    License : GNU/GPL v2
    Source code : (...)

  • 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 (...)

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  • How to get frames from HDR video in scRGB color space ?

    5 mars 2018, par Виталий Синявский

    I want to create a simple video player that will show HDR video on HDR TV. For example, this "LG Chess HDR" video. It is encoded with HEVC, its bit depth is 10 bit, pixel format is YUV420P10LE and it has metadata abount BT2020 color space and PQ transfer function.

    In this NVIDIA article I found the next :

    The display driver takes the scRGB back buffer, and converts it to the
    standard expected by the display presently connected. In general, this
    means converting the color space from sRGB primaries to BT. 2020
    primaries, scaling to an appropriate level, and encoding with a
    mechanism like PQ. Also, possibly performing conversions like RGB to
    YCC if that display connection requires it.

    It means that my player should render pixels in the scRGB color space (linear encoding, sRGB primaries, full range is -0.5 through just less than +7.5). So I need to get frames from the source video in this color space somehow, preferably in FP16 pixel format (half float, 16 bits per one color channel). I come to the following simple pipeline to render videos to HDR :

    source HDR video in BT2020 color space with applied PQ -> [some video library] -> 
    
-> video frames with colors in scRGB color space -> [my program] ->
    
-> rendered video on HDR TV with applied conversions by display driver

    I’m trying to use FFmpeg as this library and do not understand how to get frames from the source HDR video in scRGB color space.

    I use sws_scale FFmpeg method now to get frames and know about filters API. But I did not found any information and help about how to transparantly get frames in scRGB using these functionality without parsing metadata for all source videos and create custom video filters for them.

    Please, tell me what I can do to get frames in the scRGB color space using FFmpeg. Can someone tell other libraries with which I can do it ?

  • Revision 111946 : trailing space

    10 octobre 2018, par root — Log

    trailing space

  • Colour space conversion from yuv44416le to yuv420p10le using ffmpeg command line tool

    1er octobre 2018, par vixiv

    Is there a way to convert from yuv444 planar 16 bit little-endian format to yuv420 planar 10 bit little-endian format using ffmpeg ?

    I have tried the following command but failed :

    ffmpeg -y -pixel_format yuv444p16le -s 4096x4096 -r 30 -i input.yuv -pixel_format yuv420p10le -s 4096x4096 -r 30 output.yuv

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