@ -918,7 +918,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
if lang in sub_lang_list:
continue
sub_formats = []
for ext in ['sbv', 'vtt', 'srt']:
for ext in ['vtt', 'ttml']:
params = compat_urllib_parse.urlencode({
'lang': lang,
'v': video_id,