Re-Encode local video files using the H.265 compression method

h265_reencode.rb

#
# Re-encode video files with the more efficient h.265 file format.
#
# The original file is appended with the extension `.original` once successfully converted.
# The new file has the .MOV extension.
#
require 'pathname'

EXTENSIONS = "m2ts,flv,mov,wmv,avi,mp4,mpg,m4a,3gp,3g2,mj2"

Pathname.glob("**/*.{#{EXTENSIONS}}", File::FNM_CASEFOLD | File::FNM_EXTGLOB).each do |path|
  next if path.directory?
  puts "=================================================================================================="

  name          = path.basename(path.extname)
  output_path   = path.dirname.join("#{name}.MOV")
  temp_path     = path.dirname.join("#{name}.temp.MOV")
  original_path = path.dirname.join("#{name}#{path.extname}.original")

  originals = Pathname.glob("**/*#{name}.{#{EXTENSIONS}}.original", File::FNM_CASEFOLD | File::FNM_EXTGLOB)
  unless originals.empty?
    puts "Already converted: #{path}"
    next
  end

  puts "Converting: #{path} to: #{output_path} via: #{temp_path}. Old: #{original_path}"
  begin
    # Incomplete previous run?
    temp_path.delete if temp_path.exist?

    cmd = "ffmpeg -hide_banner -i \"#{path}\" -c:v libx265 -preset medium  -tag:v hvc1 -pix_fmt yuv420p \"#{temp_path}\""
    # puts cmd
    `#{cmd}`
    if exc = $!
      raise(exc)
    end
    temp_path.utime(path.mtime, path.mtime)
    path.rename(original_path)
    temp_path.rename(output_path)
  rescue StandardError => exc
    puts "#{path}: #{exc.class}: #{exc.message}"
  ensure
    temp_path.delete if temp_path.exist?
  end
end.count