[extractor/youtube] Retry manifest refresh for live-from-start (#5670)

Avoids ending download early when live stream is temporarily offline.
Best used with somewhat large `--retry-sleep extractor:` and `--extractor-retries`

Authored by: mzhou

yt_dlp/extractor/youtube.py

@@ -2650,18 +2650,19 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
             """
             @returns (manifest_url, manifest_stream_number, is_live) or None
             """
+            for retry in self.RetryManager(fatal=False):
                 with lock:
                     refetch_manifest(format_id, delay)
 
                 f = next((f for f in formats if f['format_id'] == format_id), None)
                 if not f:
                     if not is_live:
-                    self.to_screen(f'{video_id}: Video is no longer live')
+                        retry.error = f'{video_id}: Video is no longer live'
                     else:
-                    self.report_warning(
+                        retry.error = f'Cannot find refreshed manifest for format {format_id}{bug_reports_message()}'
-                        f'Cannot find refreshed manifest for format {format_id}{bug_reports_message()}')
+                    continue
-                return None
                 return f['manifest_url'], f['manifest_stream_number'], is_live
+            return None
 
         for f in formats:
             f['is_live'] = is_live