diff --git a/requirements.txt b/requirements.txt
index fc693c9..b0fabc1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-MIDIUtil==1.2.1
+MIDIUtil>=1.2.1
 opencv-python>=4.2.0.34
-pygame==2.0.1
-PyOpenGL==3.1.0
+pygame>=2.0.1
+PyOpenGL>=3.1.0
diff --git a/requirements_optional.txt b/requirements_optional.txt
new file mode 100644
index 0000000..3025730
--- /dev/null
+++ b/requirements_optional.txt
@@ -0,0 +1 @@
+pytube
\ No newline at end of file
diff --git a/v2m.py b/v2m.py
index fe0e18b..191be7f 100755
--- a/v2m.py
+++ b/v2m.py
@@ -7,6 +7,7 @@
 
 import sys
 import os
+import re
 
 filepath=''
 if ( len(sys.argv) < 2 ):
@@ -25,9 +26,29 @@
   filepath = sys.argv[1]
 
 if not os.path.exists( filepath ):
-  print("file not exists [" + filepath +"]")
-  sys.exit( 0 )
+  has_pytube = False
 
+  try:
+    from pytube import YouTube
+    has_pytube = True
+  except:
+    pass
+
+  if has_pytube:
+    print("Downloading video by url: %s ..." % filepath)
+    yt = YouTube( filepath )
+    videos = [ { 'itag' : i.itag, 'res' : int(re.sub('[^0-9]','', i.resolution)), 'progressive' : int(i.is_progressive) }  for i in yt.streams.filter(file_extension='mp4') if i.mime_type.find("video") != -1 ]
+    print(videos)
+    videos = sorted( videos , key = lambda d : ( -d['progressive'], - d['res']) ) 
+    print('sorted by progressive (has video & audio in same file) and video resolution')
+    for i in videos:
+      print('processing: %s' % i)
+      filepath = "%s_%s_%s.mp4" % ( re.sub(r'[\W_]','_', yt.title), i['itag'], i['res'])
+      yt.streams.get_by_itag(i['itag']).download( "./" , filepath, skip_existing=True)
+      break
+  else:
+    print("file not exists [" + filepath +"], and no pytube has installed..., exit.")
+    sys.exit( 0 )
 
 import math
 import cv2