[utils] Register SOCKS protocols in urllib and support SOCKS4A

youtube_dl/YoutubeDL.py

@@ -64,6 +64,7 @@ from .utils import (
     PostProcessingError,
     preferredencoding,
     prepend_extension,
+    register_socks_protocols,
     render_table,
     replace_extension,
     SameFileError,
@@ -361,6 +362,8 @@ class YoutubeDL(object):
         for ph in self.params.get('progress_hooks', []):
             self.add_progress_hook(ph)
 
+        register_socks_protocols()
+
     def warn_if_short_id(self, argv):
         # short YouTube ID starting with dash?
         idxs = [