Class: FFMPEG::Transcoder

Inherits:
Object
  • Object
show all
Defined in:
lib/ffmpeg/transcoder.rb

Instance Method Summary collapse

Constructor Details

#initialize(movie, output_file, options = EncodingOptions.new, transcoder_options = {}) ⇒ Transcoder

Returns a new instance of Transcoder.



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# File 'lib/ffmpeg/transcoder.rb', line 5

def initialize(movie, output_file, options = EncodingOptions.new, transcoder_options = {})
  @movie = movie
  @output_file = output_file
  
  if options.is_a?(String) || options.is_a?(EncodingOptions)
    @raw_options = options
  elsif options.is_a?(Hash)
    @raw_options = EncodingOptions.new(options)
  else
    raise ArgumentError, "Unknown options format '#{options.class}', should be either EncodingOptions, Hash or String."
  end
  
  @transcoder_options = transcoder_options
  @errors = []
  
  apply_transcoder_options
end

Instance Method Details

#encoded ⇒ Object 



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# File 'lib/ffmpeg/transcoder.rb', line 78

def encoded
  @encoded ||= Movie.new(@output_file)
end

#encoding_succeeded? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ffmpeg/transcoder.rb', line 56

def encoding_succeeded?
  unless File.exists?(@output_file)
    @errors << "no output file created"
    return false
  end
  
  unless encoded.valid?
    @errors << "encoded file is invalid"
    return false
  end
  
  if validate_duration?
    precision = 1.1
    unless !(encoded.duration >= (@movie.duration * precision) or encoded.duration <= (@movie.duration / precision))
      @errors << "encoded file duration differed from original (original: #{@movie.duration}sec, encoded: #{encoded.duration}sec)"
      return false
    end
  end
  
  true
end

#run ⇒ Object 



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# File 'lib/ffmpeg/transcoder.rb', line 23

def run
  command = "ffmpeg -y -i '#{@movie.path}' #{@raw_options} '#{@output_file}'"
  FFMPEG.logger.info("Running transcoding...\n#{command}\n")
  output = ""
  last_output = nil
  Open3.popen3(command) do |stdin, stdout, stderr|
    stderr.each("r") do |line|
      output << line
      if line =~ /time=(\d+.\d+)/
        time = $1.to_f
        progress = time / @movie.duration
        yield(progress) if block_given?
      end
      if line =~ /Unsupported codec/
        FFMPEG.logger.error "Failed encoding...\nCommand\n#{command}\nOutput\n#{output}\n"
        raise "Failed encoding: #{line}"
      end
      last_output = line
    end
  end

  if encoding_succeeded?
    FFMPEG.logger.info "Transcoding of #{@movie.path} to #{@output_file} succeeded\n"
    yield(1.0) if block_given?
  else
    errors = @errors.empty? ? "" : "Errors: #{@errors.join(", ")}"
    FFMPEG.logger.error "Failed encoding...\n#{command}\n\n#{output}\n#{errors}\n"
    raise "Failed encoding. Last output: #{last_output}. #{errors}"
  end
  
  encoded
end