Module: Speedrun::FFmpeg

Defined in:
lib/speedrun/ffmpeg.rb

Constant Summary collapse

FREEZE_START_PATTERN = 
/freeze_start:\s*([\d.]+)/
FREEZE_END_PATTERN = 
/freeze_end:\s*([\d.]+)/
DURATION_PATTERN = 
/Duration:\s*(\d{2}):(\d{2}):(\d{2}\.\d+)/
TIME_PATTERN = 
/time=(\d{2}):(\d{2}):(\d{2}\.\d+)/

Class Method Summary collapse

Class Method Details

.detect_freezes(file_path, noise_threshold: -70,, min_duration: 1.0, quiet: false, &block) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/speedrun/ffmpeg.rb', line 50

def self.detect_freezes(file_path, noise_threshold: -70, min_duration: 1.0, quiet: false, &block)
  raise ArgumentError, "File not found: #{file_path}" unless File.exist?(file_path)

  cmd = [
    'ffmpeg',
    '-i', file_path,
    '-vf', "freezedetect=n=#{noise_threshold}dB:d=#{min_duration}",
    '-f', 'null',
    '-'
  ]

  output = String.new
  duration = nil

  Open3.popen3(*cmd) do |stdin, stdout, stderr, wait_thr|
    stdin.close

    stderr.each_line do |line|
      output << line

      # Extract duration from first line that contains it
      if duration.nil? && line =~ DURATION_PATTERN
        duration = Formatter.parse_time("#{$1}:#{$2}:#{$3}")
      end

      # Extract current time and calculate progress
      if duration && block_given? && line =~ TIME_PATTERN
        current_time = Formatter.parse_time("#{$1}:#{$2}:#{$3}")
        progress = [(current_time / duration * 100).round, 100].min
        block.call(progress)
      end
    end

    wait_thr.value # Wait for process to complete
  end

  parse_freezes(output)
end

.extract_and_concat(input_file, output_file, keep_regions, quiet: false, &block) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/speedrun/ffmpeg.rb', line 89

def self.extract_and_concat(input_file, output_file, keep_regions, quiet: false, &block)
  raise ArgumentError, "File not found: #{input_file}" unless File.exist?(input_file)
  raise ArgumentError, "No regions to keep" if keep_regions.empty?

  abs_input = File.absolute_path(input_file)

  Tempfile.create(['concat', '.txt']) do |concat_file|
    keep_regions.each do |start_time, end_time|
      concat_file.puts "file '#{abs_input}'"
      concat_file.puts "inpoint #{start_time}"
      concat_file.puts "outpoint #{end_time}"
    end
    concat_file.flush

    cmd = [
      'ffmpeg',
      '-f', 'concat',
      '-safe', '0',
      '-i', concat_file.path,
      '-c', 'copy',
      '-y',
      output_file
    ]

    output = String.new
    duration = nil
    success = false

    Open3.popen3(*cmd) do |stdin, stdout, stderr, wait_thr|
      stdin.close

      stderr.each_line do |line|
        output << line

        # Extract duration from first line that contains it
        if duration.nil? && line =~ DURATION_PATTERN
          duration = Formatter.parse_time("#{$1}:#{$2}:#{$3}")
        end

        # Extract current time and calculate progress
        if duration && block_given? && line =~ TIME_PATTERN
          current_time = Formatter.parse_time("#{$1}:#{$2}:#{$3}")
          progress = [(current_time / duration * 100).round, 100].min
          block.call(progress)
        end
      end

      success = wait_thr.value.success?
    end

    raise "FFmpeg failed: #{output}" unless success

    success
  end
end

.get_duration(file_path) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/speedrun/ffmpeg.rb', line 35

def self.get_duration(file_path)
  raise ArgumentError, "File not found: #{file_path}" unless File.exist?(file_path)

  cmd = [
    'ffprobe',
    '-v', 'error',
    '-show_entries', 'format=duration',
    '-of', 'default=noprint_wrappers=1:nokey=1',
    file_path
  ].shelljoin

  output = `#{cmd}`
  parse_duration(output)
end

.parse_duration(output) ⇒ Object 



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# File 'lib/speedrun/ffmpeg.rb', line 14

def self.parse_duration(output)
  output.strip.to_f
end

.parse_freezes(output) ⇒ Object 



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# File 'lib/speedrun/ffmpeg.rb', line 18

def self.parse_freezes(output)
  regions = []
  freeze_start = nil

  output.each_line do |line|
    if line =~ FREEZE_START_PATTERN
      freeze_start = ::Regexp.last_match(1).to_f
    elsif line =~ FREEZE_END_PATTERN && freeze_start
      freeze_end = ::Regexp.last_match(1).to_f
      regions << [freeze_start, freeze_end]
      freeze_start = nil
    end
  end

  regions
end