Contents

module Ffmprb

  class << self

    # NOTE not for streaming just yet
    def find_silence(input_file, output_file)
      path = "#{input_file.path}->#{output_file.path}"
      logger.debug "Finding silence (#{path})"
      silence = []
      Util.ffmpeg('-i', input_file.path, *find_silence_detect_args, output_file.path).
        scan(SILENCE_DETECT_REGEX).each do |mark, time|
        time = time.to_f

        case mark
        when 'start'
          silence << OpenStruct.new(start_at: time)
        when 'end'
          if silence.empty?
            silence << OpenStruct.new(start_at: 0.0, end_at: time)
          else
            fail Error, "ffmpeg is being stupid: silence_end with no silence_start"  if silence.last.end_at
            silence.last.end_at = time
          end
        else
          Ffmprb.warn "Unknown silence mark: #{mark}"
        end
      end
      logger.debug "Found silence (#{path}): [#{silence.map{|t,v| "#{t}: #{v}"}}]"
      silence
    end

    private

    SILENCE_DETECT_REGEX = /\[silencedetect\s.*\]\s*silence_(\w+):\s*(\d+\.?\d*)/

    def find_silence_detect_args
      Filter.complex_args Filter.silencedetect
    end

  end

end

Version data entries

4 entries across 4 versions & 1 rubygems

Version	Path
ffmprb-0.11.3	lib/ffmprb/find_silence.rb
ffmprb-0.11.2	lib/ffmprb/find_silence.rb
ffmprb-0.10.1	lib/ffmprb/find_silence.rb
ffmprb-0.10.0	lib/ffmprb/find_silence.rb