[extractor/mtv] fix mgid extraction

Fixes: #29814, #30139

youtube_dl/extractor/mtv.py

@@ -290,7 +290,17 @@ class MTVServicesInfoExtractor(InfoExtractor):
             main_container = self._extract_child_with_type(data, 'MainContainer')
             ab_testing = self._extract_child_with_type(main_container, 'ABTesting')
             video_player = self._extract_child_with_type(ab_testing or main_container, 'VideoPlayer')
-            mgid = video_player['props']['media']['video']['config']['uri']
+            if video_player:
+                mgid = video_player['props']['media']['video']['config']['uri']
+            else:
+                flex_wrapper = self._extract_child_with_type(ab_testing or main_container, 'FlexWrapper')
+                auth_suite_wrapper = self._extract_child_with_type(flex_wrapper, 'AuthSuiteWrapper')
+                player = self._extract_child_with_type(auth_suite_wrapper or flex_wrapper, 'Player')
+                if player:
+                    mgid = player['props']['videoDetail']['mgid']
+
+        if not mgid:
+            raise ExtractorError('Could not extract mgid')
 
         return mgid