diff --git a/README.md b/README.md
index 263a42e..babd884 100644
--- a/README.md
+++ b/README.md
@@ -202,6 +202,32 @@ docker exec -it machete /var/www/machete/bin/upgrade.sh
 ```
 
 
+### 配置修改
+
+修改配置有两种方式：
+1. 进入容器目录：/var/www/machete/runtime/，修改**custom_config.json**后保存即可；
+2. 命令行修改
+```
+docker exec -it machete php /var/www/machete/bin/command.php config "do=set&key=screenshot_start&val=1000"
+```
+
+上述命令为修改配置项**screenshot_start**的示例。
+
+配置读取、修改、删除命令：
+```
+php /var/www/machete/bin/command.php config "参数"
+```
+
+参数说明：
+* do  - 操作，可选值：get, all, set, del（分别对应获取单个配置项、所有配置项、设置单个配置项、删除单个配置项）
+* key - 配置项名称
+* val - 配置项值
+
+
+说明：
+不支持数组类型的配置修改，可用配置项明细参考：**conf/app.php**。
+
+
 ## 后台管理内容
 
 最新版本已经支持网页版后台和samba文件共享方式管理内容。
diff --git a/bin/upgrade.sh b/bin/upgrade.sh
index 243c58a..bc1ff72 100755
--- a/bin/upgrade.sh
+++ b/bin/upgrade.sh
@@ -66,6 +66,9 @@ if [ -f "master.tar.gz" ]; then
 
 fi
 
+echo "Machete front-end upgraded."
+echo ""
+
 
 # upgrade admin
 cd /var/www/downloads/
@@ -79,6 +82,16 @@ if [ -f "master.tar.gz" ]; then
     mv jialuomaadmin/dist/ /var/www/machete/www/admin
 
 fi
+echo "Admin system upgraded."
+echo ""
+
 
-echo "Machete upgrade done."
+# upgrade nginx config
+cp /var/www/machete/conf/nginx_machete.conf /etc/nginx/http.d/machete.conf
+/usr/sbin/nginx -s reload
+echo "Nginx config upgraded and reloaded."
+echo ""
+
+echo ""
+echo "==Machete upgrade done.=="
 echo ""
diff --git a/conf/app.php b/conf/app.php
index f43b130..8cd7b86 100644
--- a/conf/app.php
+++ b/conf/app.php
@@ -51,6 +51,7 @@ $configs = array(
 
     'supportedImageExts' => array('jpg', 'jpeg', 'png', 'webp', 'gif'),
     'supportedVideoExts' => array('mp4', 'mov', 'm3u8'),
+    'screenshot_start' => 8000,     //视频播放页快照截取开始时间，单位：毫秒
 
     /*
     //视频皮肤配置
diff --git a/conf/nginx_machete.conf b/conf/nginx_machete.conf
index f644f36..7737925 100644
--- a/conf/nginx_machete.conf
+++ b/conf/nginx_machete.conf
@@ -11,7 +11,12 @@ server {
     root /var/www/machete/www;
     index index.php index.html;
 
-    location ~ .*\.(gif|jpg|jpeg|png|webp|bmp|swf|js|css|ico|mp4|ts)$ {
+    location ~ /.*/([^\/]*\.(gif|jpg|jpeg|png|webp|bmp|swf|js|css|ico|mp4|ts))$ {
+        # support file download
+        if ($arg_download) {
+            add_header Content-disposition "attachment; filename=$1";
+        }
+
         expires 30d;
     }
 
diff --git a/controller/CommandController.php b/controller/CommandController.php
index 293d1d3..4f3810b 100644
--- a/controller/CommandController.php
+++ b/controller/CommandController.php
@@ -18,6 +18,72 @@ eof;
         exit;
     }
 
+    public function actionConfig() {
+        $themeName = FSC::$app['config']['theme'];
+
+        $code = 1;
+        $data = '';
+
+        //修改配置文件
+        $param_do = $this->get('do', 'set');    //支持：set, get, all, del
+        $param_key = $this->get('key', '');
+        $param_value = $this->get('val', '');
+
+        if ($param_do == 'set' && empty($param_value)) {
+            throw new Exception("缺少val参数！", 403);
+        }else if (in_array($param_do, array('set', 'get', 'del')) && empty($param_key)) {
+            throw new Exception("缺少key参数！", 403);
+        }
+
+
+        $config_file = __DIR__ . "/../runtime/custom_config.json";
+        if (file_exists($config_file)) {
+            $content = file_get_contents($config_file);
+            $configs = @json_decode($content, true);
+            if (empty($configs)) {
+                $config_file_template = __DIR__ . "/../conf/custom_config_{$themeName}.json";
+                $content = file_get_contents($config_file_template);
+                $configs = @json_decode($content, true);
+            }
+        }
+
+        if (!empty($configs)) {
+            switch($param_do) {
+                case 'set':
+                    $configs[$param_key] = $param_value;
+                    file_put_contents($config_file, json_encode($configs, JSON_PRETTY_PRINT));
+                    $data = $configs;
+                    break;
+
+                case 'get':
+                    $data = !empty($configs[$param_key]) ? $configs[$param_key] : '';
+                    break;
+
+                case 'del':
+                    unset($configs[$param_key]);
+                    file_put_contents($config_file, json_encode($configs, JSON_PRETTY_PRINT));
+                    $data = $configs;
+                    break;
+
+                case 'all':
+                default:
+                    $data = $configs;
+                    break;
+            }
+        }
+
+
+        $res = compact('code', 'data');
+
+        echo "命令参数：\n";
+        print_r($this->get());
+        echo "\n";
+        echo "命令执行结果：\n";
+        print_r($res);
+        echo "\n\n";
+        exit;
+    }
+
     public function actionTest() {
         echo "## App variables:\n";
         print_r(FSC::$app);
diff --git a/themes/beauty/views/site/player.php b/themes/beauty/views/site/player.php
index 4f684cb..0880dff 100644
--- a/themes/beauty/views/site/player.php
+++ b/themes/beauty/views/site/player.php
@@ -29,6 +29,7 @@
 <div class="videoplayer">
     <video
         data-id="<?php echo $viewData['videoId']; ?>"
+        data-screenshot-start="<?php echo FSC::$app['config']['screenshot_start']; ?>"
         class="video-js vjs-big-play-centered vjs-fluid vjs-16-9"
         controls
         playsinline
@@ -37,7 +38,7 @@
         <source src="<?php echo $viewData['videoUrl']; ?>" type="video/mp4">
     </video>
     <div class="text-right mt-2 mr-1">
-        <a class="btn btn-default" href="<?php echo $viewData['videoUrl']; ?>">
+        <a class="btn btn-default" href="<?php echo $viewData['videoUrl']; ?>&download=1">
             ⬇️
             下载视频
         </a>
diff --git a/www/js/beauty.js b/www/js/beauty.js
index 2069a30..4d1f28e 100644
--- a/www/js/beauty.js
+++ b/www/js/beauty.js
@@ -358,6 +358,16 @@ if ($('#my-player').length > 0 && typeof(videojs) != 'undefined') {
     };
 
     myPlayer.one('playing', function() {
-        setTimeout(takeScreenshot, 1000);
+        var screenshot_start = $('video.vjs-tech').attr('data-screenshot-start');
+
+        if (screenshot_start) {
+            screenshot_start = parseInt(screenshot_start);
+        }
+
+        if (!screenshot_start) {
+            screenshot_start = 1000;
+        }
+
+        setTimeout(takeScreenshot, screenshot_start);
     });
 }
\ No newline at end of file