Remove all metadata from MP4 files for better processing by Plex.

remove_exif.rb

#!/bin/ruby

# This script specifically removes all meta data from mp4 files which have a title property set
# You can't change this property unfortunately. So instead just strip all metadata from the file with ffmpeg.

# Requirements:
# brew install ffmpeg exiftool

# Just set the path to all of your mp4 files
path = '/Volumes/Movies'

# Loop through all files recursively
Dir.glob("#{path}/**/*") do |original_file|
  next if original_file == '.' or original_file == '..'

  ext = File.extname(original_file)
  directory = File.dirname(original_file)
  filename = File.basename(original_file)

  # mp4 files only
  if ext.downcase == '.mp4'

    # Check if we need to even process this file:
    result = `exiftool -G1 -a -s -title "#{original_file}"`
    if result.length > 0
      puts "Updating meta data for #{original_file}"
      puts result
      new_file = "#{directory}/new_#{filename}"
      `ffmpeg -i "#{original_file}" -map_metadata -1 -c:v copy -c:a copy "#{new_file}"`
      `mv -f "#{new_file}" "#{original_file}"`
    end
  end
end