+local padding_effect = main_chain:add_effect(PaddingEffect.new(), resample_effect);
+padding_effect:set_int("width", 1280);
+padding_effect:set_int("height", 720);
+padding_effect:set_float("left", 30.0);
+padding_effect:set_float("top", 60.0);
+local wb_effect = main_chain:add_effect(WhiteBalanceEffect.new(), padding_effect);