Respect the download parameter in YoutubeDL.process_video_result if the extractor handle the format selection

youtube_dl/YoutubeDL.py

@@ -461,7 +461,8 @@ class YoutubeDL(object):
 
         # This extractors handle format selection themselves
         if info_dict['extractor'] in [u'youtube', u'Youku', u'YouPorn', u'mixcloud']:
-            self.process_info(info_dict)
+            if download:
+                self.process_info(info_dict)
             return info_dict
 
         # We now pick which formats have to be downloaded