fix nm video DL issue when logged in

youtube_dl/extractor/niconico.py

@@ -89,7 +89,7 @@ class NiconicoIE(InfoExtractor):
         if self._AUTHENTICATED:
             # Get flv info
             flv_info_webpage = self._download_webpage(
-                'http://flapi.nicovideo.jp/api/getflv?v=' + video_id,
+                'http://flapi.nicovideo.jp/api/getflv/' + video_id + '?as3=1',
                 video_id, 'Downloading flv info')
         else:
             # Get external player info
@@ -97,7 +97,6 @@ class NiconicoIE(InfoExtractor):
                 'http://ext.nicovideo.jp/thumb_watch/' + video_id, video_id)
             thumb_play_key = self._search_regex(
                 r'\'thumbPlayKey\'\s*:\s*\'(.*?)\'', ext_player_info, 'thumbPlayKey')
-
             # Get flv info
             flv_info_data = compat_urllib_parse.urlencode({
                 'k': thumb_play_key,