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