@ -508,6 +508,8 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
sub_lang_list = {}
for l in lang_list:
lang = l[1]
if lang in sub_lang_list:
continue
params = compat_urllib_parse.urlencode({
'lang': lang,
'v': video_id,