[youtube] Fix protocol-independent URLs (Fixes #1768)

diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index c992cba978441081a50e5f134a4a694c83a6685c..ed82e4fc02878b1cac9019ca1439ac7d31ca8cd7 100644 (file)
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -1019,6 +1019,8 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
         """Turn the encrypted s field into a working signature"""
 
         if player_url is not None:
+            if player_url.startswith(u'//'):
+                player_url = u'https:' + player_url
             try:
                 player_id = (player_url, len(s))
                 if player_id not in self._player_cache: