[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
             """
-            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')
-                else:
-                    self.report_warning(
-                        f'Cannot find refreshed manifest for format {format_id}{bug_reports_message()}')
-                return None
-            return f['manifest_url'], f['manifest_stream_number'], is_live
+            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:
+                        retry.error = f'{video_id}: Video is no longer live'
+                    else:
+                        retry.error = f'Cannot find refreshed manifest for format {format_id}{bug_reports_message()}'
+                    continue
+                return f['manifest_url'], f['manifest_stream_number'], is_live
+            return None
 
         for f in formats:
             f['is_live'] = is_live