diff --git a/app/src/main/java/com/github/catvod/bean/alist/Item.java b/app/src/main/java/com/github/catvod/bean/alist/Item.java
index 8a0c166a..016f1bda 100644
--- a/app/src/main/java/com/github/catvod/bean/alist/Item.java
+++ b/app/src/main/java/com/github/catvod/bean/alist/Item.java
@@ -105,7 +105,7 @@ public class Item {
     }
 
     public String getExt() {
-        return getName().substring(getName().lastIndexOf(".") + 1);
+        return Utils.getExt(getName());
     }
 
     public String getVodId(String id) {
diff --git a/app/src/main/java/com/github/catvod/spider/WebDAV.java b/app/src/main/java/com/github/catvod/spider/WebDAV.java
index 10476fca..8b1c4164 100644
--- a/app/src/main/java/com/github/catvod/spider/WebDAV.java
+++ b/app/src/main/java/com/github/catvod/spider/WebDAV.java
@@ -48,7 +48,7 @@ public class WebDAV extends Spider {
     }
 
     private String getExt(DavResource item) {
-        return item.getName().substring(item.getName().lastIndexOf(".") + 1);
+        return Utils.getExt(item.getName());
     }
 
     private String removeExt(DavResource item) {