diff --git a/demo/mask_detection/mask_detection.py b/demo/mask_detection/mask_detection.py
index 7ef6767cb5b62b69f1e962362d30c0a7a5eec895..3929def96469467e240cdb40c48d3ede079617d2 100644
--- a/demo/mask_detection/mask_detection.py
+++ b/demo/mask_detection/mask_detection.py
@@ -32,7 +32,7 @@ name = "./result/1-mask_detection.mp4"
 width = 1280
 height = 720
 fps = 30
-fourcc = cv2.VideoWriter_fourcc(*'mp4v')
+fourcc = cv2.VideoWriter_fourcc(*'vp90')
 writer = cv2.VideoWriter(name, fourcc, fps, (width, height))
 
 maskIndex = 0
diff --git a/demo/mask_detection/web/index.php b/demo/mask_detection/web/index.php
index bd79f1c14c71e1af8d9ddfa0687192c1e46fc48e..ba323ce50c572fcb4f18776b6db9785c63a7af0a 100644
--- a/demo/mask_detection/web/index.php
+++ b/demo/mask_detection/web/index.php
@@ -1,5 +1,5 @@
 <?php
-$json_string = file_get_contents(".\\video\\result\\2-mask_detection.json"); 
+$json_string = file_get_contents(".\\video\\result\\2-mask_detection.json");
 // 用参数true把JSON字符串强制转成PHP数组 
 $data_o = json_decode($json_string, true);
 ?>