Add format #46 - WebM 1920x1080.

youtube-dl

@@ -1177,8 +1177,8 @@ class YoutubeIE(InfoExtractor):
 	_AGE_URL = 'http://www.youtube.com/verify_age?next_url=/&gl=US&hl=en'
 	_NETRC_MACHINE = 'youtube'
 	# Listed in order of quality
-	_available_formats = ['38', '37', '22', '45', '35', '44', '34', '18', '43', '6', '5', '17', '13']
-	_available_formats_prefer_free = ['38', '37', '45', '22', '44', '35', '43', '34', '18', '6', '5', '17', '13']
+	_available_formats = ['38', '37', '46', '22', '45', '35', '44', '34', '18', '43', '6', '5', '17', '13']
+	_available_formats_prefer_free = ['38', '46', '37', '45', '22', '44', '35', '43', '34', '18', '6', '5', '17', '13']
 	_video_extensions = {
 		'13': '3gp',
 		'17': 'mp4',
@@ -1189,6 +1189,7 @@ class YoutubeIE(InfoExtractor):
 		'43': 'webm',
 		'44': 'webm',
 		'45': 'webm',
+		'46': 'webm',
 	}
 	_video_dimensions = {
 		'5': '240x400',
@@ -1204,6 +1205,7 @@ class YoutubeIE(InfoExtractor):
 		'43': '360x640',
 		'44': '480x854',
 		'45': '720x1280',
+		'46': '1080x1920',
 	}	
 	IE_NAME = u'youtube'