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tools/loudnorm.rb
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Marton Balint
tools: add loudnorm script example to use loudnorm
11 ноя 2016, 21:22
11 ноя 2016, 21:22
7b8445f
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#!/usr/bin/env ruby require 'open3' require 'json' ffmpeg_bin = 'ffmpeg' target_il = -24.0 target_lra = +11.0 target_tp = -2.0 samplerate = '48k' if ARGF.argv.count != 2 puts "Usage: #{$PROGRAM_NAME} input.wav output.wav" exit 1 end ff_cmd = Array.new([ ffmpeg_bin, '-hide_banner', '-i', ARGF.argv[0], '-af', "loudnorm='I=#{target_il}:LRA=#{target_lra}:tp=#{target_tp}:print_format=json'", '-f', 'null', '-']); _stdin, _stdout, stderr, wait_thr = Open3.popen3(*ff_cmd) if wait_thr.value.success? stats = JSON.parse(stderr.read.lines[-12, 12].join) loudnorm_string = 'loudnorm=' loudnorm_string += 'print_format=summary:' loudnorm_string += 'linear=true:' loudnorm_string += "I=#{target_il}:" loudnorm_string += "LRA=#{target_lra}:" loudnorm_string += "tp=#{target_tp}:" loudnorm_string += "measured_I=#{stats['input_i']}:" loudnorm_string += "measured_LRA=#{stats['input_lra']}:" loudnorm_string += "measured_tp=#{stats['input_tp']}:" loudnorm_string += "measured_thresh=#{stats['input_thresh']}:" loudnorm_string += "offset=#{stats['target_offset']}" else puts stderr.read exit 1 end ff_cmd = Array.new([ ffmpeg_bin, '-y', '-hide_banner', '-i', ARGF.argv[0], '-af', loudnorm_string, '-ar', samplerate, ARGF.argv[1].to_s]); _stdin, _stdout, stderr, wait_thr = Open3.popen3(*ff_cmd) if wait_thr.value.success? puts stderr.read.lines[-12, 12].join exit 0 else puts stderr.read exit 1 end