set_dates.rb

#!/usr/bin/env ruby

require 'set'

def parse(filename)
  if filename.start_with?('clip')
    return filename.match(/^clip-(\d+)-(\d+)-(\d+)\s+(\d+);(\d+);(\d+)/).captures
  else
    return filename.match(/^(\d+)-(\d+)-(\d+)\s+(\d+)\.(\d+)\.(\d+)/).captures
  end
end

def stamp(filename)
  puts "Now stamping #{filename}"
  year, month, day, hour, minute, second = parse(filename)  
  `SetFile -d "#{month}/#{day}/#{year} #{hour}:#{minute}:#{second}" "#{filename}"`
  `exiftool "-datetimeoriginal<filecreatedate" "#{filename}"`
  `rm "#{filename}_original"`
end

Dir.glob('**/*.mp4').each { |filename|
  stamp(filename)
}