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• Passing arguments to Powershells Call Operatore - I can't get it to work

  2 janvier 2020, par morgola22

  For some reason I cannot get even the most simple Ffmpeg case to work :

  $pathToFfmpeg = "PathToFfmpeg\ffmpeg.exe"
  
  $video = "PathToVideoFile\video.mp4"
  
  $param = "--i $video", "output.avi"
  
  $execute = &$pathToFfmpeg $param

  This should result in the most basic Ffmpeg usage according to Ffmpeg website : ffmpeg -i input.mp4 output.avi.
  However all I receive is :

  ffmpeg.exe : ffmpeg version git-2020-01-01-7b58702 Copyright (c) 2000-2020 the FFmpeg developers
  
  At line:4 char:12
  
  + [string[]] $execute = &$pathToFfmpeg $param
  
  +                          ~~~~~~~~~~~~~~~~~~~~~
  
      + CategoryInfo          : NotSpecified: (ffmpeg version ...mpeg developers:String) [], RemoteException
  
      + FullyQualifiedErrorId : NativeCommandError
  
  
  
    built with gcc 9.2.1 (GCC) 20191125
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass 
  
  --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb 
  
  --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame 
  
  --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma 
  
  --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex 
  
  --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec 
  
  --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  
    libavutil      56. 38.100 / 56. 38.100
  
    libavcodec     58. 65.100 / 58. 65.100
  
    libavformat    58. 35.101 / 58. 35.101
  
    libavdevice    58.  9.102 / 58.  9.102
  
    libavfilter     7. 70.101 /  7. 70.101
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
    libpostproc    55.  6.100 / 55.  6.100
  
  Unrecognized option '-i PathToVideoFile\video.mp4'.
  
  Error splitting the argument list: Option not found

  So it seems I am doing something wrong. Anybody knows how I get this to work ? I have tried different methods to create the params array and checked with EchoArgs.exe, but no avail. I am out of ideas. It looks like Ffmpeg does not recognise what Powershell is passing to it.

• Evolution #4350 (En cours) : Faire l’ajout de la config mini dans le paquet.xml d’ecrire

  24 septembre 2019, par b b

  Pour revenir sur la proposition d’augmenter à PHP 5.6 mini je pense qu’on peut le faire sans problème. Pour info, on nécessitait PHP 5.4 mini pour raison de compat avec debian 7, cf r23619 => "On nécessite PHP 5.4 minimum. Note : Debian 7 Wheezy est supportée avec PHP 5.4 jusque fin mai 2018…"

  À ce jour, la version mini de PHP sous debian est la 5.6 proposée par debian 8 qui est supportée jusqu’au 30 juin 2020, ref https://wiki.debian.org/fr/LTS & https://packages.debian.org/fr/jessie/php5

• 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 ?