youtubedl-subtitle-404-workaround.diff

diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index 19370f62b..8dc4547c4 100755
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -1813,6 +1813,7 @@ class YoutubeDL(object):
             # that way it will silently go on when used with unsupporting IE
             subtitles = info_dict['requested_subtitles']
             ie = self.get_info_extractor(info_dict['extractor_key'])
+            failed_sub_langs = []
             for sub_lang, sub_info in subtitles.items():
                 sub_format = sub_info['ext']
                 sub_filename = subtitles_filename(filename, sub_lang, sub_format, info_dict.get('ext'))
@@ -1838,7 +1839,10 @@ class YoutubeDL(object):
                         except (ExtractorError, IOError, OSError, ValueError) as err:
                             self.report_warning('Unable to download subtitle for "%s": %s' %
                                                 (sub_lang, error_to_compat_str(err)))
+                            failed_sub_langs.append(sub_lang)
                             continue
+            for sub_lang in failed_sub_langs:
+                del info_dict['requested_subtitles'][sub_lang]
 
         if self.params.get('writeinfojson', False):
             infofn = replace_extension(filename, 'info.json', info_dict.get('ext'))