[ie/youtube] Improve logging

yt_dlp/extractor/youtube/_video.py

@@ -2920,7 +2920,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
         if player_url and context == _PoTokenContext.GVS and not visitor_data and not self.is_authenticated:
             self.report_warning(
                 f'Unable to fetch GVS PO Token for {client} client: Missing required Visitor Data. '
-                f'You may need to pass Visitor Data with --extractor-args "youtube:visitor_data=XXX"')
+                f'You may need to pass Visitor Data with --extractor-args "youtube:visitor_data=XXX"', only_once=True)
             return
 
         if context == _PoTokenContext.PLAYER and not video_id:
@@ -2943,7 +2943,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
         if player_url and context == _PoTokenContext.GVS and not data_sync_id and self.is_authenticated:
             self.report_warning(
                 f'Unable to fetch GVS PO Token for {client} client: Missing required Data Sync ID for account. '
-                f'You may need to pass a Data Sync ID with --extractor-args "youtube:data_sync_id=XXX"')
+                f'You may need to pass a Data Sync ID with --extractor-args "youtube:data_sync_id=XXX"', only_once=True)
             return
 
         po_token = self._fetch_po_token(