The real deal remux script that can remux videos with M4V compatible video stream. Audio stream will be encoded to 192kbps aac if it is not m4v compatible audio.

remux.rb

#!/usr/bin/env ruby
# Remux MP4/H264 videos (mkv, avi, etc.) to m4v.

TMPFILE = "/tmp/ffprobe_out.txt"
VIDEO_CONTAINER = ["mkv", "f4v", "avi", "divx", "ts"]
VCODECS = ["mpeg4", "h264"]
ACODECS = ["aac"]

if (`which ffmpeg` == "")
  puts "You need ffmpeg to use this command."
  exit 1
end

def detect(file)
  system("ffprobe -v info \"#{file}\" > #{TMPFILE} 2>&1")
  output = open(TMPFILE).read
  vregex = /Stream .+? Video: (\w+) /
  vmatch = vregex.match(output)
  vcodec = vmatch[1] unless vmatch.nil?
  aregex = /Stream .+? Audio: (\w+),? /
  amatch = aregex.match(output)
  acodec = amatch[1] unless amatch.nil?
  File.unlink TMPFILE
  return [acodec, vcodec]
end

def supported_files(noencode=false)
  files = []
  Dir["*.*"].each do |file|
    acodec = detect(file)[0]
    ext = file.split(".").last
    next unless VIDEO_CONTAINER.include?(ext.downcase)
    next if noencode && !ACODECS.include?(acodec)
    files << file
  end
  files
end

def remux(noencode=false)
  counter = 1;file_count = supported_files(noencode).size
  supported_files(noencode).each do |file|
    ext = file.split(".").last
    name = File.basename file, ".#{ext}"
    outfile = "#{name}.m4v"
    acodec,vcodec = detect(file)
    unless VCODECS.include?(vcodec)
      puts "#{file}: video codec \"#{vcodec}\" is not compatible with m4v."
      next
    end
    print "Remuxing #{file} (#{counter}/#{file_count})..."

    other_opt = ""
    other_opt = "-absf aac_adtstoasc" #if ext.downcase == "ts"
    File.unlink outfile if File.exists?(outfile)
    if ACODECS.include?(acodec)
      system("ffmpeg -v error -i '#{file}' -c:a copy -c:v copy #{other_opt} '#{outfile}'")
    else
      system("ffmpeg -v error -i '#{file}' -c:a:192 aac -c:v copy #{other_opt} '#{outfile}'")
    end
    puts "Done"
    counter += 1
  end
end

if ARGV[0] == "info"
  supported_files.each do |file|
    acodec,vcodec = detect(file)
    if VCODECS.include?(vcodec) && acodec != "aac"
      puts "\"#{file}\" needs to re-encode audio track (acodec: \"#{acodec}\")."
    elsif (!VCODECS.include?(vcodec))
      puts "\"#{file}\" is not able to remux to M4V (vcodec: \"#{vcodec}\")."
    else
      puts "\"#{file}\" is M4V ready!"
    end
  end
elsif ARGV[0] == "noencode" || ARGV[0] == "nc"
  remux(true)
else
  remux
end