anchor.diff:      (if useFdk then "--enable-fdk-aac"            else "")
     ];
   
  +  # NOTE: 2018-12-27: Check NixOS HandBrake test if changing
     NIX_LDFLAGS = [
       "-lx265"
     ];
  
positive.code:     sha256 = "03clkknaq3mz84p85cvr21gsy9b8vv2g4vvyfz44hz8la253jfqi";
    };
  
    patched_libav_12 = libav_12.overrideAttrs (super: {
      patches = (super.patches or []) ++ [(
        # NOTE: 2018-04-26: HandBrake compilation (1.1.0) requires
        # a patch of LibAV (12.3) from HandBrake team. This patch
        # not went LibAV upstream.
        fetchurl {
          url = ''https://raw.githubusercontent.com/HandBrake/HandBrake/9e1f245708a157231c427c0ef9b91729d59a30e1/contrib/ffmpeg/A21-mp4-sdtp.patch'';
          sha256 = "14grzyvb1qbb90k31ibabnwmwnrc48ml6h2z0rjamdv83q45jq4g";
        })
        # NOTE: 2018-11-11: Transcoding to MP4 can fail with:
        #
        # Tag avc1/0x31637661 incompatible with output codec id '28'
        # muxavformat: avformat_write_header failed!
        #
        # Fix using Handbrake patch that is not upstream in libav.
        (
        fetchurl {
          url = ''https://raw.githubusercontent.com/HandBrake/HandBrake/df6c26fa261423237ee2bec0bf784c32cbfda3fa/contrib/ffmpeg/A20-avc3-hvc1-override.patch'';
          sha256 = "1vijd7bmkzp3sb6zhpcpdni8fz4h13wgglnml6cz9f44j41w2c3v";
        })
      ];
    });
  
    nativeBuildInputs = [
      python2 pkgconfig yasm autoconf automake libtool m4
    ] ++ lib.optionals useGtk [ intltool wrapGAppsHook ];
  
    buildInputs = [
      fribidi fontconfig freetype jansson zlib
      libass libiconv libsamplerate libxml2 bzip2
      libogg libopus libtheora libvorbis libdvdcss a52dec libmkv
      lame libdvdread libdvdnav libbluray mp4v2 mpeg2dec x264 x265 libvpx
    ] ++ lib.optionals useGtk [
      glib gtk3 libappindicator-gtk3 libnotify
      gst_all_1.gstreamer gst_all_1.gst-plugins-base dbus-glib udev
      libgudev hicolor-icon-theme
    ] ++ (if useFfmpeg then [ ffmpeg ] else [ patched_libav_12 ])
    ++ lib.optional useFdk fdk_aac;
  
    enableParallelBuilding = true;
  
  
negative.code: # Upstream distributes HandBrake with bundle of according versions of libraries and patches to them.
  #
  # Derivation patches HandBrake to use Nix closure dependencies.
  #
  
  { stdenv, lib, fetchurl,
    python2, pkgconfig, autoconf, automake, yasm, libtool, m4,
    fribidi, fontconfig, freetype, jansson, zlib,
    libass, libiconv, libsamplerate, libxml2, bzip2,
    ffmpeg_4, libtheora, x264, x265, libvpx, mpeg2dec,
    libopus, lame, libvorbis, a52dec,
    libogg, libmkv, mp4v2,
    libdvdread, libdvdnav, libdvdcss, libbluray,
    useGtk ? true, wrapGAppsHook ? null,
                   intltool ? null,
                   glib ? null,
                   gtk3 ? null,
                   libappindicator-gtk3 ? null,
                   libnotify ? null,
                   gst_all_1 ? null,
                   dbus-glib ? null,
                   udev ? null,
                   libgudev ? null,
                   hicolor-icon-theme ? null,
    useFdk ? false, fdk_aac ? null
  }:
  
  stdenv.mkDerivation rec {
    version = "1.2.0";
    name = "handbrake-${version}";
  
  