[RUBY] executable that removes the first n and last m seconds from an MP4 video without re-encoding and saves it to an output directory out_dir.

NagOff.rb

#!/usr/bin/env ruby
# Removes first startTrim and last endTrim seconds of an MP4 file and stores the resulting file in out_dir.

FFMPEG    = "ffmpeg"    # => path to the FFmpeg
FFPROBE   = "ffprobe"   # => path to FFProbe

startTrim = 5
endTrim = 6
						
if RUBY_VERSION =~ /1\.8[\.\d]*/
  puts "Doesn't work with #{RUBY_VERSION}, needs at least 1.9.2"
  exit
end

if ARGV.length != 1
  puts "Usage: NagOff.rb <input>"
  puts "       input filename needed"
  exit
end

input_file = ARGV[0]
out_dir = "Trimmed"


# ----------------------------------------------------------------------------


begin
puts "This script will remove the first #{startTrim} and last #{endTrim} seconds from a specified video file and place it in a subdirectory of the original named #{out_dir}. The values for startTrim, endTrim, and out_dir can be set in PlayOff.rb. This script must be run from a command prompt in the directory where the original file is located."

#Creates the output directory if it does not exist.
if not File.directory?(out_dir)
  puts "Output folder not found; will create." 
  system("mkdir #{out_dir}")
  end

endTrimTemp = 5
endTrimFinal = 10
probeCommand = "#{FFPROBE} -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 \"#{input_file}\""

cmd = "|" + probeCommand
open(cmd, 'w+') do | subprocess |
  subprocess.read.split("\n").each do |output|
    puts "#{output}"
	endTrimTemp = "#{output}".to_i
	endTrimFinal = endTrimTemp-(startTrim+endTrim)
	puts "#{endTrimTemp}"
	puts "#{endTrimFinal}"
    trimCommand = "#{FFMPEG} -ss #{startTrim} -i \"#{input_file}\" -c copy -to #{endTrimFinal} \"#{out_dir}/#{input_file}\""
	puts "#{trimCommand}"
	system(trimCommand)
	puts "Great Success!"

	
end
end
end