diff --git a/stream.py b/stream.py
index ba72847..1999a3c 100755
--- a/stream.py
+++ b/stream.py
@@ -190,8 +190,33 @@ class MainHandler(tornado.web.RequestHandler):
             self.set_status(404)
             self.write("HTML template missing.")
     def handle_embed(self, provider):
-        max_width = self.get_query_argument("maxwidth", "320")
-        max_height = self.get_query_argument("maxheight", "180")
+        width = self.get_query_argument("maxwidth")
+        height = self.get_query_argument("maxheight")
+        if isinstance(width, str) and isinstance(height, str):
+            pass
+        if isinstance(width, str):
+            try:
+                width_num = (int(width) // 16) * 16
+            except Exception:
+                width = "320"
+                height = "180"
+            else:
+                height_num = (width_num * 9) / 16
+                height = str(height_num)
+                width = str(width_num)
+        elif isinstance(height, str):
+            try:
+                height_num = (int(height) // 9) * 9
+            except Exception:
+                width = "320"
+                height = "180"
+            else:
+                width_num = (height_num * 16) / 9
+                width = str(width_num)
+                height = str(height_num)
+        else:
+            width = "320"
+            height = "180"
         origin = self.request.path
         if stream_server is not None:
             origin = f'{stream_server}{self.request.path}'