[flickr] use "download" URLs (#6360)

gallery_dl/extractor/flickr.py

@@ -45,7 +45,7 @@ class FlickrExtractor(Extractor):
                 self.log.debug("", exc_info=exc)
             else:
                 photo.update(data)
-                url = photo["url"]
+                url = self._file_url(photo)
                 yield Message.Directory, photo
                 yield Message.Url, url, text.nameext_from_url(url, photo)
 
@@ -57,6 +57,13 @@ class FlickrExtractor(Extractor):
     def photos(self):
         """Return an iterable with all relevant photo objects"""
 
+    def _file_url(self, photo):
+        if "video" in photo:
+            return photo["url"]
+
+        path, _, ext = photo["url"].rpartition(".")
+        return path + "_d." + ext
+
 
 class FlickrImageExtractor(FlickrExtractor):
     """Extractor for individual images from flickr.com"""
@@ -98,7 +105,7 @@ class FlickrImageExtractor(FlickrExtractor):
                 if isinstance(value, dict):
                     location[key] = value["_content"]
 
-        url = photo["url"]
+        url = self._file_url(photo)
         yield Message.Directory, photo
         yield Message.Url, url, text.nameext_from_url(url, photo)