diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index 1b8a938e5..0dc869d56 100755
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -1820,7 +1820,6 @@ class YoutubeDL(object):
             # subtitles download errors are already managed as troubles in relevant IE
             # 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'])
             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'))
@@ -1839,10 +1838,10 @@ class YoutubeDL(object):
                     else:
                         try:
                             dl(sub_filename, sub_info)
-                        except (
-                            ExtractorError, IOError, OSError, ValueError,
-                            compat_urllib_error.URLError,
-                            compat_http_client.HTTPException, socket.error) as err:
+                        except (ExtractorError, IOError, OSError, ValueError,
+                                compat_urllib_error.URLError,
+                                compat_http_client.HTTPException,
+                                socket.error) as err:
                             self.report_warning('Unable to download subtitle for "%s": %s' %
                                                 (sub_lang, error_to_compat_str(err)))
                             continue
diff --git a/youtube_dl/downloader/youtube_live_chat.py b/youtube_dl/downloader/youtube_live_chat.py
index 64d1d20b2..214a37203 100644
--- a/youtube_dl/downloader/youtube_live_chat.py
+++ b/youtube_dl/downloader/youtube_live_chat.py
@@ -28,7 +28,7 @@ class YoutubeLiveChatReplayFD(FragmentFD):
             return self._download_fragment(ctx, url, info_dict, headers)
 
         def parse_yt_initial_data(data):
-            raw_json = re.search(b'window\["ytInitialData"\]\s*=\s*(.*);', data).group(1)
+            raw_json = re.search(rb'window\["ytInitialData"\]\s*=\s*(.*);', data).group(1)
             return json.loads(raw_json)
 
         self._prepare_and_start_frag_download(ctx)