Merge remote-tracking branch 'liudongmiao/patch-subtitle'

diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index 2c44f36a514ea1fc0cfaffaa34b82573a6c8eace..225e2b7f4681e8cce471a8a80af0f64eb14e071e 100644 (file)
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -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,