diff --git a/app/src/main/java/com/frank/ffmpeg/activity/VideoHandleActivity.java b/app/src/main/java/com/frank/ffmpeg/activity/VideoHandleActivity.java
index cbef6b2..0084e74 100644
--- a/app/src/main/java/com/frank/ffmpeg/activity/VideoHandleActivity.java
+++ b/app/src/main/java/com/frank/ffmpeg/activity/VideoHandleActivity.java
@@ -137,7 +137,8 @@ public class VideoHandleActivity extends BaseActivity {
             case R.id.btn_screen_shot://视频截图
                 String screenShot = PATH + File.separator + "screenShot.jpg";
                 String size = "1080x720";
-                commandLine = FFmpegUtil.screenShot(srcFile, size, screenShot);
+                int time = 18;
+                commandLine = FFmpegUtil.screenShot(srcFile, time, size, screenShot);
                 break;
             case R.id.btn_water_mark://视频添加水印
                 //1、图片
diff --git a/app/src/main/java/com/frank/ffmpeg/util/FFmpegUtil.java b/app/src/main/java/com/frank/ffmpeg/util/FFmpegUtil.java
index e2a0031..1cadd86 100644
--- a/app/src/main/java/com/frank/ffmpeg/util/FFmpegUtil.java
+++ b/app/src/main/java/com/frank/ffmpeg/util/FFmpegUtil.java
@@ -144,13 +144,14 @@ public class FFmpegUtil {
     /**
      * 使用ffmpeg命令行进行视频截图
      * @param srcFile 源文件
+     * @param time 截图开始时间
      * @param size 图片尺寸大小
      * @param targetFile 目标文件
      * @return 截图后的文件
      */
-    public static  String[] screenShot(String srcFile, String size, String targetFile){
-        String screenShotCmd = "ffmpeg -i %s -f image2 -t 0.001 -s %s %s";
-        screenShotCmd = String.format(screenShotCmd, srcFile, size, targetFile);
+    public static  String[] screenShot(String srcFile, int time, String size, String targetFile){
+        String screenShotCmd = "ffmpeg -i %s -f image2 -ss %d -s %s %s";
+        screenShotCmd = String.format(Locale.getDefault(), screenShotCmd, srcFile, time, size, targetFile);
         return screenShotCmd.split(" ");//以空格分割为字符串数组
     }