Creating a homebrew formula for libcaption

[bbgdzxng1]

I would like to create a brew formula for libcaption to make install easier for users.

Does anyone have a working brew formula which we could contribute to the homebrew project?

Below uses brew to create a basic template.

$ brew create 'https://github.com/szatmary/libcaption/archive/master.zip'

EDITED: Removed old version of libcaption.rb.

[szatmary]

This is a great effort. Thank you for doing this.

[bbgdzxng1]

I'm not entirely sure that the brew formula will work for all users at this stage, so I would welcome any feedback from the community, especially those with experience of the awesome homebrew.

Big public thanks to @szatmary for libcaption. I'm not sure there is any other FOSS software out there which handles encoding of CEA/EIA 608/708.

[bbgdzxng1]

Below is a proposed libcaption.rb for release version 0.7, which appears to compile libcaption successfully, with necessary dependencies. Any feedback or improvements are welcome.

Save the following snippet to /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libcaption.rb

libcaption.rb

class Libcaption < Formula
  desc "Library for the creation and parsing of closed caption data"
  homepage "https://github.com/szatmary/libcaption"

  url "https://github.com/szatmary/libcaption/archive/0.7.tar.gz"
  # version "0.7"
  sha256 "125c9c55e1d5f0dc37ef151fa9583dd2fcfaefe7699d348c7292e634859e527e"
  revision 0

  # --HEAD version
  head "https://github.com/szatmary/libcaption.git"

  depends_on "cmake" => :build
  depends_on "ffmpeg" => :build
  depends_on "re2c" => :build

  def install
    system "cmake", ".", *std_cmake_args
    system "make", "install"
  end

  test do
    # Create an FLV video file
    INPUT_VIDEO = testpath/"input_video.flv"
    system "ffmpeg", "-report", "-hide_banner",
    "-f", "lavfi", "-i", "smptebars=duration=2:size=640x360:rate=30",
    "-c:v", "libx264", "-crf", "23", "-preset", "ultrafast",
    "-f", "flv", INPUT_VIDEO
    # system "ffprobe", "-i", INPUT_VIDEO

    INPUT_CAPTION_FILE = testpath/"input_caption.srt"
    INPUT_CAPTION_FILE.write <<~EOS
      1
      00:00:00,000 --> 00:00:02,000
      Caption Text
    EOS
    OUTPUT_FILE = testpath/"output.flv"
    system bin/"flv+srt", INPUT_VIDEO, INPUT_CAPTION_FILE, OUTPUT_FILE
    assert_predicate OUTPUT_FILE, :exist?
  end
end

Simple installation for users

$ brew install libcaption

Testing the brew formula, for maintainers

$ brew info libcaption
  libcaption: stable 0.7
  Library for the creation and parsing of closed caption data
  https://github.com/szatmary/libcaption
  Not installed

# Run brew's formula audit tools, checking the integrity of the formula
$ brew audit --strict libcaption

$ brew install --dry-run libcaption

$ brew install libcaption

# Run the test process (create an flv using FFmpeg, create an srt, use Libcaption flv+srt, check output exists)
$ brew test libcaption

# Reinstall / Uninstall
$ brew reinstall libcaption
$ brew uninstall libcaption

# Install latest version from HEAD
$ brew install libcaption --HEAD
$ brew uninstall libcaption

# Return back to stable version 0.7
$ brew install libcaption

[bbgdzxng1]

I have submitted a PR to Homebrew Core https://github.com/Homebrew/homebrew-core/pull/34453

Unfortunately, @BrewTestBot is waiting for libcaption to gain further traction.

GitHub repository not notable enough (<30 forks, <30 watchers and <75 stars)

Latest version is...

class Libcaption < Formula
  desc "Library for the creation and parsing of closed caption data"
  homepage "https://github.com/szatmary/libcaption"

  url "https://github.com/szatmary/libcaption/archive/0.7.tar.gz"
  sha256 "125c9c55e1d5f0dc37ef151fa9583dd2fcfaefe7699d348c7292e634859e527e"

  depends_on "cmake" => :build
  depends_on "ffmpeg" => [:build, :test]
  depends_on "re2c" => :build

  def install
    system "cmake", ".", *std_cmake_args
    system "make", "install"
  end

  test do
    # Create an FLV video file
    INPUT_VIDEO = testpath/"input_video.flv"
    system "ffmpeg", "-report", "-hide_banner",
    "-f", "lavfi", "-i", "smptebars=duration=2:size=640x360:rate=30",
    "-c:v", "libx264", "-crf", "23", "-preset", "ultrafast",
    "-f", "flv", INPUT_VIDEO

    INPUT_CAPTION_FILE = testpath/"input_caption.srt"
    INPUT_CAPTION_FILE.write <<~EOS
      1
      00:00:00,000 --> 00:00:02,000
      Caption Text
    EOS
    OUTPUT_FILE = testpath/"output.flv"
    system bin/"flv+srt", INPUT_VIDEO, INPUT_CAPTION_FILE, OUTPUT_FILE
    assert_predicate OUTPUT_FILE, :exist?
  end
end

[bbgdzxng1]

GitHub repository not notable enough (<30 forks, <30 watchers and <75 stars)

Still waiting for libcaption to get further traction before it can be included in Homebrew Core. At end of 2019, there are:

• 26 forks
• 15 watchers
• 60 stars

@szatmary If I were to put together a final formula, would you consider adding a homebrew-libcaption repo to host the Homebrew tap file? Users could then install libcaption with:

$ brew tap szatmary/libcaption
$ brew install libcaption