strip-silence.rb

#! /usr/bin/env ruby

# strip-silence version 1.1
# 
# Usage:
#   strip-silence input.mp4
#
# Description:
#   Uses auto-editor to identify areas of silence in input.mp4,
#   then uses ffmpeg to strip them out (without recompression).
#   Creates a new file input_STRIPPED.mp4 in the same directory.
#
#   Notes:
#
#   1. Cuts may not be exact because lossless cuts can only occur
#   at keyframes.
#
#   2. Areas of silence shorter than 200 frames
#   are ignored (this can be changed by editing the script).
#
#   3. Requires a working ruby, auto-editor, and ffmpeg installation.
#
# Copyright 2021 Gene Goykhman
#
# The MIT License
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of this software
# and associated documentation files (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge, publish, distribute,
# sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
# is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all copies or
# substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
# BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

require 'json'

def cleanup
  Dir.glob('_segment*.*').each do |file|
    File.delete(file)
  end
end

def fps(input_file)
  info = `ffmpeg -i \"#{input_file}\" 2>&1`
  if /\s([\d\.]*)\sfps/ =~ info
    return $1.to_f
  end
  return 0.0
end

def process_json(input_file, fps, json)
  extension = File.extname(input_file)
  segment_number = 1
  File.open("_segments.txt", "w") do |f|
    json["chunks"].each do |chunk|    
      if chunk[2] == 1
        start_time = chunk[0] / fps
        end_time = chunk[1] / fps
        cmd = "ffmpeg -i \"#{input_file}\" -ss #{start_time} -to #{end_time} -c copy _segment#{segment_number}#{extension}"
        `#{cmd}`
        f.write("file _segment#{segment_number}#{extension}\n")
        segment_number += 1
      end
    end
  end
end

def combine_segments(input_file)
  `ffmpeg -f concat -safe 0 -i _segments.txt -c copy \"#{File.basename(input_file, ".*")}_STRIPPED#{File.extname(input_file)}\"`
end

def process_file(input_file)
  fps = fps(input_file)
  abort("Unable to determine FPS of #{input_file}") unless fps > 0.0
  `auto-editor \"#{input_file}\" --export json -mcut 200`
  json_file = File.basename(input_file, ".*") + "_ALTERED.json"
  
  json = JSON.parse(File.read(json_file))
  process_json(input_file, fps, json)
  File.delete(json_file)
  combine_segments(input_file)
  cleanup()
end

def iterate_files
  ARGV.each do |input_file|
    process_file(input_file)
  end
end

cleanup()
iterate_files()

Is there a python version of this script?

@AhmedThahir No I don't think so.

I have rewritten the code in Python. Can you please help me out with it? I'm facing an issue.

WyattBlue/auto-editor#399