default info_dict['format'] to info_dict['ext'] and make the YT one more verbose

youtube_dl/FileDownloader.py

@@ -355,6 +355,9 @@ class FileDownloader(object):
 		# Keep for backwards compatibility
 		info_dict['stitle'] = info_dict['title']
 
+		if not 'format' in info_dict:
+			info_dict['format'] = info_dict['ext']
+
 		reason = self._match_entry(info_dict)
 		if reason is not None:
 			self.to_screen(u'[download] ' + reason)