ffmpegdecklink.rb

class Ffmpegdecklink < Formula
  desc "FFmpeg with --enable-decklink"
  homepage "https://ffmpeg.org/"
  url "https://ffmpeg.org/releases/ffmpeg-4.2.1.tar.xz"
  sha256 "cec7c87e9b60d174509e263ac4011b522385fd0775292e1670ecc1180c9bb6d4"
  revision 1
  head "https://github.com/FFmpeg/FFmpeg.git"
  keg_only "anything that needs this will know where to look"

  option "with-chromaprint", "Enable the Chromaprint audio fingerprinting library"
  option "with-fdk-aac", "Enable the Fraunhofer FDK AAC library"
  option "with-libass", "Enable ASS/SSA subtitle format"
  option "with-iec61883", "Enable DV device (Linux)" if OS.linux?
  option "with-librsvg", "Enable SVG files as inputs via librsvg"
  option "with-libsoxr", "Enable the soxr resample library"
  option "with-libssh", "Enable SFTP protocol via libssh"
  option "with-tesseract", "Enable the tesseract OCR engine"
  option "with-libvidstab", "Enable vid.stab support for video stabilization"
  option "with-opencore-amr", "Enable Opencore AMR NR/WB audio format"
  option "with-openh264", "Enable OpenH264 library"
  option "with-openjpeg", "Enable JPEG 2000 image format"
  option "with-openssl", "Enable SSL support"
  option "with-rtmpdump", "Enable RTMP protocol"
  option "with-rubberband", "Enable rubberband library"
  option "with-webp", "Enable using libwebp to encode WEBP images"
  option "with-zeromq", "Enable using libzeromq to receive commands sent through a libzeromq client"
  option "with-zimg", "Enable z.lib zimg library"
  option "with-srt", "Enable SRT library"

  deprecated_option "with-libtesseract" => "with-tesseract"

  depends_on "nasm" => :build
  depends_on "pkg-config" => :build
  depends_on "texi2html" => :build

  depends_on "amiaopensource/amiaos/decklinksdk"
  depends_on "freetype"
  depends_on "lame"
  depends_on "libvorbis"
  depends_on "libvpx"
  depends_on "openjpeg"
  depends_on "opus"
  depends_on "sdl2"
  depends_on "snappy"
  depends_on "theora"
  depends_on "x264"
  depends_on "x265"
  depends_on "xvid"
  depends_on "xz"

  depends_on "chromaprint" => :optional
  depends_on "fdk-aac" => :optional
  depends_on "fontconfig" => :optional
  depends_on "frei0r" => :optional
  depends_on "game-music-emu" => :optional
  depends_on "libass" => :optional
  depends_on "libbluray" => :optional
  depends_on "libbs2b" => :optional
  depends_on "libcaca" => :optional
  depends_on "libgsm" => :optional
  depends_on "libmodplug" => :optional
  depends_on "librsvg" => :optional
  depends_on "libsoxr" => :optional
  depends_on "libssh" => :optional
  depends_on "libvidstab" => :optional
  depends_on "opencore-amr" => :optional
  depends_on "openh264" => :optional
  depends_on "openssl" => :optional
  depends_on "rtmpdump" => :optional
  depends_on "rubberband" => :optional
  depends_on "speex" => :optional
  depends_on "srt" => :optional
  depends_on "tesseract" => :optional
  depends_on "two-lame" => :optional
  depends_on "wavpack" => :optional
  depends_on "webp" => :optional
  depends_on "zeromq" => :optional
  depends_on "zimg" => :optional

  patch :DATA

  def install
    # Work around Xcode 11 clang bug, see:
    # https://bitbucket.org/multicoreware/x265/issues/514/wrong-code-generated-on-macos-1015
    # https://trac.ffmpeg.org/ticket/8073
    ENV.append_to_cflags "-fno-stack-check" if DevelopmentTools.clang_build_version >= 1010

    args = %W[
      --prefix=#{prefix}
      --disable-shared
      --enable-version3
      --cc=#{ENV.cc}
      --host-cflags=#{ENV.cflags}
      --host-ldflags=#{ENV.ldflags}
      --enable-gpl
      --enable-libfreetype
      --enable-libmp3lame
      --enable-libopus
      --enable-libsnappy
      --enable-libtheora
      --enable-libvorbis
      --enable-libvpx
      --enable-libx264
      --enable-libx265
      --enable-libxvid
    ]

    args << "--enable-chromaprint" if build.with? "chromaprint"
    args << "--enable-frei0r" if build.with? "frei0r"
    args << "--enable-libass" if build.with? "libass"
    args << "--enable-libbluray" if build.with? "libbluray"
    args << "--enable-libbs2b" if build.with? "libbs2b"
    args << "--enable-libcaca" if build.with? "libcaca"
    args << "--enable-libfdk-aac" if build.with? "fdk-aac"
    args << "--enable-libfontconfig" if build.with? "fontconfig"
    args << "--enable-libgme" if build.with? "game-music-emu"
    args << "--enable-libgsm" if build.with? "libgsm"
    args << "--enable-libiec61883" if (build.with? "iec61883") && OS.linux?
    args << "--enable-libmodplug" if build.with? "libmodplug"
    args << "--enable-libopencore-amrnb" << "--enable-libopencore-amrwb" if build.with? "opencore-amr"
    args << "--enable-libopenh264" if build.with? "openh264"
    args << "--enable-librsvg" if build.with? "librsvg"
    args << "--enable-librtmp" if build.with? "rtmpdump"
    args << "--enable-librubberband" if build.with? "rubberband"
    args << "--enable-libsoxr" if build.with? "libsoxr"
    args << "--enable-libspeex" if build.with? "speex"
    args << "--enable-libsrt" if build.with? "srt"
    args << "--enable-libssh" if build.with? "libssh"
    args << "--enable-libtesseract" if build.with? "tesseract"
    args << "--enable-libtwolame" if build.with? "two-lame"
    args << "--enable-libvidstab" if build.with? "libvidstab"
    args << "--enable-libwavpack" if build.with? "wavpack"
    args << "--enable-libwebp" if build.with? "webp"
    args << "--enable-libzimg" if build.with? "zimg"
    args << "--enable-libzmq" if build.with? "zeromq"
    args << "--enable-opencl" if MacOS.version > :lion
    args << "--enable-openssl" if build.with? "openssl"
    args << "--enable-videotoolbox" if MacOS.version >= :mountain_lion

    # force libopenjpeg options
    args << "--enable-libopenjpeg"
    args << "--disable-decoder=jpeg2000"
    args << "--extra-cflags=" + `pkg-config --cflags libopenjp2`.chomp

    # decklink options
    args << "--enable-nonfree"
    args << "--enable-decklink"
    args << "--extra-cflags=-I#{HOMEBREW_PREFIX}/include"
    args << "--extra-ldflags=-L#{HOMEBREW_PREFIX}/include"

    system "./configure", *args

    system "make"
    bin.install "ffmpeg" => "ffmpeg-dl"
    bin.install "ffprobe" => "ffprobe-dl"
    bin.install "ffplay" => "ffplay-dl"

    if build.with? "tools"
      system "make", "alltools"
      bin.install Dir["tools/*"].select { |f| File.executable? f }
      # Fix for non-executables that were installed to bin
      mv bin/"python", pkgshare/"python", :force => true
    end
  end

  test do
    # Create an example mp4 file
    mp4out = testpath/"video.mp4"
    system bin/"ffmpeg-dl", "-filter_complex", "testsrc=rate=1:duration=1", mp4out
    assert_predicate mp4out, :exist?
  end
end

__END__
diff --git a/libavdevice/avfoundation.m b/libavdevice/avfoundation.m
index af8fe31367..5ee2f0a1bc 100644
--- a/libavdevice/avfoundation.m
+++ b/libavdevice/avfoundation.m
@@ -496,7 +496,7 @@ static int add_video_device(AVFormatContext *s, AVCaptureDevice *video_device)
 
         [ctx->video_output setVideoSettings:capture_dict];
     }
-    [ctx->video_output setAlwaysDiscardsLateVideoFrames:YES];
+    [ctx->video_output setAlwaysDiscardsLateVideoFrames:NO];
 
     ctx->avf_delegate = [[AVFFrameReceiver alloc] initWithContext:ctx];
 
--