[chaturbate] Improve error extraction (Closes #7989)

youtube_dl/extractor/chaturbate.py

@@ -23,6 +23,8 @@ class ChaturbateIE(InfoExtractor):
         'only_matching': True,
     }]
 
+    _ROOM_OFFLINE = 'Room is currently offline'
+
     def _real_extract(self, url):
         video_id = self._match_id(url)
 
@@ -34,9 +36,16 @@ class ChaturbateIE(InfoExtractor):
 
         if not m3u8_url:
             error = self._search_regex(
-                r'<span[^>]+class=(["\'])desc_span\1[^>]*>(?P<error>[^<]+)</span>',
+                [r'<span[^>]+class=(["\'])desc_span\1[^>]*>(?P<error>[^<]+)</span>',
-                webpage, 'error', group='error')
+                 r'<div[^>]+id=(["\'])defchat\1[^>]*>\s*<p><strong>(?P<error>[^<]+)<'],
+                webpage, 'error', group='error', default=None)
+            if not error:
+                if any(p not in webpage for p in (
+                        self._ROOM_OFFLINE, 'offline_tipping', 'tip_offline')):
+                    error = self._ROOM_OFFLINE
+            if error:
                 raise ExtractorError(error, expected=True)
+            raise ExtractorError('Unable to find stream URL')
 
         formats = self._extract_m3u8_formats(m3u8_url, video_id, ext='mp4')