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 bc122c80..bf8f9ebe 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
@@ -110,10 +110,6 @@ public class Item {
         return getType() == 0 || getType() == 2 || getType() == 5;
     }
 
-    public String getExt() {
-        return Util.getExt(getName());
-    }
-
     public String getVodId(String id) {
         return id + getPath() + "/" + getName();
     }
diff --git a/app/src/main/java/com/github/catvod/spider/AList.java b/app/src/main/java/com/github/catvod/spider/AList.java
index 8889ff36..9cf76529 100644
--- a/app/src/main/java/com/github/catvod/spider/AList.java
+++ b/app/src/main/java/com/github/catvod/spider/AList.java
@@ -238,7 +238,10 @@ public class AList extends Spider {
 
     private String findSubs(String path, List<Item> items) {
         StringBuilder sb = new StringBuilder();
-        for (Item item : items) if (Util.isSub(item.getExt())) sb.append("~~~").append(item.getName()).append("@@@").append(item.getExt()).append("@@@").append(item.getVodId(path));
+        for (Item item : items) {
+            String ext = Util.getExt(item.getName());
+            if (Util.isSub(ext)) sb.append("~~~").append(item.getName()).append("@@@").append(ext).append("@@@").append(item.getVodId(path));
+        }
         return sb.toString();
     }
 
diff --git a/app/src/main/java/com/github/catvod/spider/Samba.java b/app/src/main/java/com/github/catvod/spider/Samba.java
index 8fa8b416..de9c0c34 100644
--- a/app/src/main/java/com/github/catvod/spider/Samba.java
+++ b/app/src/main/java/com/github/catvod/spider/Samba.java
@@ -105,7 +105,7 @@ public class Samba extends Spider {
         while (iterator.hasNext()) {
             FileIdBothDirectoryInformation item = iterator.next();
             if (isFolder(item) && item.getFileName().startsWith(".")) iterator.remove();
-            if (isFile(item) && !Util.MEDIA.contains(Util.getExt(item.getFileName()))) iterator.remove();
+            if (isFile(item) && !Util.isMedia(item.getFileName())) iterator.remove();
         }
         Collections.sort(items, (o1, o2) -> {
             if (isFolder(o1) && isFile(o2)) return -1;
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 fdcef656..3176bad3 100644
--- a/app/src/main/java/com/github/catvod/spider/WebDAV.java
+++ b/app/src/main/java/com/github/catvod/spider/WebDAV.java
@@ -144,7 +144,7 @@ public class WebDAV extends Spider {
 
     private List<DavResource> getSubs(List<DavResource> items) {
         List<DavResource> subs = new ArrayList<>();
-        for (DavResource item : items) if (Util.isSub(getExt(item))) subs.add(item);
+        for (DavResource item : items) if (Util.isSub(item.getName())) subs.add(item);
         return subs;
     }
 
diff --git a/app/src/main/java/com/github/catvod/utils/Util.java b/app/src/main/java/com/github/catvod/utils/Util.java
index 486b846d..522b5b97 100644
--- a/app/src/main/java/com/github/catvod/utils/Util.java
+++ b/app/src/main/java/com/github/catvod/utils/Util.java
@@ -45,8 +45,8 @@ public class Util {
         return RULE.matcher(url).find();
     }
 
-    public static boolean isSub(String ext) {
-        return SUB.contains(ext);
+    public static boolean isSub(String text) {
+        return SUB.contains(getExt(text).toLowerCase());
     }
 
     public static boolean isMedia(String text) {
@@ -54,7 +54,7 @@ public class Util {
     }
 
     public static String getExt(String name) {
-        return name.contains(".") ? name.substring(name.lastIndexOf(".") + 1) : name;
+        return name.contains(".") ? name.substring(name.lastIndexOf(".") + 1).toLowerCase() : name.toLowerCase();
     }
 
     public static String getSize(double size) {