[litv] Handle slight variations of meta refresh

Just in case litv.tv make some changes to their meta refresh tag.

yt_dlp/extractor/litv.py

@@ -6,6 +6,7 @@ from ..utils import (
     int_or_none,
     smuggle_url,
     unsmuggle_url,
+    traverse_obj,
 )
 
 
@@ -38,20 +39,26 @@ class LiTVIE(InfoExtractor):
             'noplaylist': True,
         },
         'skip': 'Georestricted to Taiwan',
+    }, {
+        'url': 'https://www.litv.tv/promo/miyuezhuan/?content_id=VOD00044841&',
+        'md5': '88322ea132f848d6e3e18b32a832b918',
+        'info_dict': {
+            'id': 'VOD00044841',
+            'ext': 'mp4',
+            'title': '芈月傳第1集　霸星芈月降世楚國',
+            'description': '楚威王二年，太史令唐昧夜觀星象，發現霸星即將現世。王后得知霸星的預言後，想盡辦法不讓孩子順利出生，幸得莒姬相護化解危機。沒想到眾人期待下出生的霸星卻是位公主，楚威王對此失望至極。楚王后命人將女嬰丟棄河中，居然奇蹟似的被少司命像攔下，楚威王認為此女非同凡響，為她取名芈月。',
+        },
+        'skip': 'No longer exists',
     }]
 
-    def _extract_playlist(self, seasons_list, content_type):
-        episode_title = seasons_list['title']
-        content_id = seasons_list['contentId']
-
+    def _extract_playlist(self, playlist_data, content_type):
         all_episodes = [
             self.url_result(smuggle_url(
                 self._URL_TEMPLATE % (content_type, episode['contentId']),
                 {'force_noplaylist': True}))  # To prevent infinite recursion
-            for season in seasons_list['seasons']
-            for episode in season['episode']]
+            for episode in traverse_obj(playlist_data, ('seasons', ..., 'episode', lambda _, v: v['contentId']))]
 
-        return self.playlist_result(all_episodes, content_id, episode_title)
+        return self.playlist_result(all_episodes, playlist_data['contentId'], playlist_data['title'])
 
     def _real_extract(self, url):
         url, smuggled_data = unsmuggle_url(url, {})
@@ -60,7 +67,9 @@ class LiTVIE(InfoExtractor):
 
         webpage = self._download_webpage(url, video_id)
 
-        if '<meta http-equiv="refresh" content="1;url=https://www.litv.tv/"' in webpage:
+        if self._search_regex(
+                r'(?i)<meta\s[^>]*http-equiv="refresh"\s[^>]*content="[0-9]+;\s*url=https://www\.litv\.tv/"',
+                webpage, 'meta refresh redirect', default=False, group=0):
             raise ExtractorError('No such content', expected=True)
 
         program_info = self._parse_json(self._search_regex(
@@ -74,8 +83,7 @@ class LiTVIE(InfoExtractor):
             program_info = self._download_json(
                 'https://www.litv.tv/vod/ajax/getProgramInfo', video_id,
                 query={'contentId': video_id},
-                headers={'Content-Type': 'application/json',
-                         'Accept': 'application/json'})
+                headers={'Accept': 'application/json'})
 
         series_id = program_info['seriesId']
         if self._yes_playlist(series_id, video_id, smuggled_data):
@@ -83,8 +91,7 @@ class LiTVIE(InfoExtractor):
                 'https://www.litv.tv/vod/ajax/getSeriesTree',
                 video_id,
                 query={'seriesId': series_id},
-                headers={'Content-Type': 'application/json',
-                         'Accept': 'application/json'})
+                headers={'Accept': 'application/json'})
             return self._extract_playlist(playlist_data, program_info['contentType'])
 
         video_data = self._parse_json(self._search_regex(