[ie/lbry] Support filtering of flat playlist results (#15695)

Closes #15683
Authored by: christoph-heinrich, dirkf

Co-authored-by: dirkf <1222880+dirkf@users.noreply.github.com>

yt_dlp/extractor/lbry.py

@@ -95,6 +95,7 @@ class LBRYBaseIE(InfoExtractor):
                 '_type': 'url',
                 'id': item['claim_id'],
                 'url': self._permanent_url(url, item['name'], item['claim_id']),
+                'ie_key': 'LBRY',
             }
 
     def _playlist_entries(self, url, display_id, claim_param, metadata):

yt_dlp/extractor/rumble.py

@@ -405,7 +405,7 @@ class RumbleChannelIE(InfoExtractor):
             for video_url in traverse_obj(
                 get_elements_html_by_class('videostream__link', webpage), (..., {extract_attributes}, 'href'),
             ):
-                yield self.url_result(urljoin('https://rumble.com', video_url))
+                yield self.url_result(urljoin('https://rumble.com', video_url), RumbleIE)
 
     def _real_extract(self, url):
         url, playlist_id = self._match_valid_url(url).groups()