[youtube:tab] Extract channels only from channels tab (closes #27266)

youtube_dl/extractor/youtube.py

@@ -2796,12 +2796,17 @@ class YoutubeTabIE(YoutubeBaseInfoExtractor):
             # TODO
             pass
 
-    def _shelf_entries(self, shelf_renderer):
+    def _shelf_entries(self, shelf_renderer, skip_channels=False):
         ep = try_get(
             shelf_renderer, lambda x: x['endpoint']['commandMetadata']['webCommandMetadata']['url'],
             compat_str)
         shelf_url = urljoin('https://www.youtube.com', ep)
         if shelf_url:
+            # Skipping links to another channels, note that checking for
+            # endpoint.commandMetadata.webCommandMetadata.webPageTypwebPageType == WEB_PAGE_TYPE_CHANNEL
+            # will not work
+            if skip_channels and '/channels?' in shelf_url:
+                return
             title = try_get(
                 shelf_renderer, lambda x: x['title']['runs'][0]['text'], compat_str)
             yield self.url_result(shelf_url, video_title=title)
@@ -2912,9 +2917,13 @@ class YoutubeTabIE(YoutubeBaseInfoExtractor):
             }
 
     def _entries(self, tab, identity_token):
-        slr_renderer = try_get(tab, lambda x: x['sectionListRenderer'], dict)
+        tab_content = try_get(tab, lambda x: x['content'], dict)
+        if not tab_content:
+            return
+        slr_renderer = try_get(tab_content, lambda x: x['sectionListRenderer'], dict)
         if not slr_renderer:
             return
+        is_channels_tab = tab.get('title') == 'Channels'
         continuation = None
         slr_contents = try_get(slr_renderer, lambda x: x['contents'], list) or []
         for slr_content in slr_contents:
@@ -2941,7 +2950,7 @@ class YoutubeTabIE(YoutubeBaseInfoExtractor):
                     continue
                 renderer = isr_content.get('shelfRenderer')
                 if renderer:
-                    for entry in self._shelf_entries(renderer):
+                    for entry in self._shelf_entries(renderer, not is_channels_tab):
                         yield entry
                     continue
                 renderer = isr_content.get('backstagePostThreadRenderer')
@@ -3071,7 +3080,7 @@ class YoutubeTabIE(YoutubeBaseInfoExtractor):
             description = None
             playlist_id = item_id
         playlist = self.playlist_result(
-            self._entries(selected_tab['content'], identity_token),
+            self._entries(selected_tab, identity_token),
             playlist_id=playlist_id, playlist_title=title,
             playlist_description=description)
         playlist.update(self._extract_uploader(data))