diff --git a/delete_than24.sh b/delete_than24.sh
new file mode 100755
index 0000000..ec7e983
--- /dev/null
+++ b/delete_than24.sh
@@ -0,0 +1,21 @@
+#!/bin/bash  
+set -e
+# 指定文件夹路径  
+folder="/home/pi/mp4"
+
+# 获取文件夹的大小  
+size=$(du -sh "$folder" | awk '{print int($1/1024/1024)}')  
+echo $size
+while [[ $size -gt 24 ]]
+do
+  # 获取最早创建的文件
+  oldest_file=$(ls -tr | head -1 | xargs)
+  echo $oldest_file 
+  rm -f $oldest_file
+  size=$(du -sh "$folder" | awk '{print int($1/1024/1024)}')
+  if [[ $size -le 24 ]]
+  then
+    exit 0
+  fi
+done
+
diff --git a/record.sh b/record.sh
index dd9dbef..ad8c330 100755
--- a/record.sh
+++ b/record.sh
@@ -3,7 +3,7 @@
 RTSP_URL="rtsp://admin:123456@192.168.0.123:554/mpeg4"  # RTSP流的URL
 OUTPUT_DIR="/home/pi/mp4"  # 录像文件保存的目录
 RECORD_DURATION=60  # 录像时长（秒）
-INTERNAL=1
+INTERNAL=2
 while true; do
     # 获取当前时间
     CURRENT_TIME=$(date +"%Y-%m-%d_%H-%M-%S")
diff --git a/test.mp4 b/test.mp4
new file mode 100644
index 0000000..3ae2830
Binary files /dev/null and b/test.mp4 differ