diff --git a/app/src/main/java/com/frank/ffmpeg/activity/FilterActivity.kt b/app/src/main/java/com/frank/ffmpeg/activity/FilterActivity.kt
index 8686937..8feae3c 100644
--- a/app/src/main/java/com/frank/ffmpeg/activity/FilterActivity.kt
+++ b/app/src/main/java/com/frank/ffmpeg/activity/FilterActivity.kt
@@ -13,7 +13,6 @@ import android.view.SurfaceHolder
 import android.view.SurfaceView
 import android.view.View
 import android.widget.Button
-import android.widget.Toast
 import android.widget.ToggleButton
 
 import com.frank.ffmpeg.FFmpegApplication
@@ -159,7 +158,7 @@ class FilterActivity : BaseActivity(), SurfaceHolder.Callback {
             doFilterPlay(4)
             btnSound!!.isChecked = true
         } else {
-            Toast.makeText(this@FilterActivity, getString(R.string.file_not_found), Toast.LENGTH_SHORT).show()
+            showSelectFile()
         }
     }
 
diff --git a/app/src/main/java/com/frank/ffmpeg/util/FileUtil.kt b/app/src/main/java/com/frank/ffmpeg/util/FileUtil.kt
index 103c03b..7d2bd35 100644
--- a/app/src/main/java/com/frank/ffmpeg/util/FileUtil.kt
+++ b/app/src/main/java/com/frank/ffmpeg/util/FileUtil.kt
@@ -209,16 +209,6 @@ object FileUtil {
         return null
     }
 
-    fun ensureDir(fileDir: String): Boolean {
-        if (TextUtils.isEmpty(fileDir)) {
-            return false
-        }
-        val listFile = File(fileDir)
-        return if (!listFile.exists()) {
-            listFile.mkdirs()
-        } else true
-    }
-
     fun deleteFile(path: String): Boolean {
         if (TextUtils.isEmpty(path)) {
             return false
diff --git a/app/src/main/res/values-en/strings.xml b/app/src/main/res/values-en/strings.xml
index 566ef6d..a850c58 100644
--- a/app/src/main/res/values-en/strings.xml
+++ b/app/src/main/res/values-en/strings.xml
@@ -90,7 +90,7 @@
     <string name="video_sharp">sharp</string>
 
     <string name="select_file">Select file</string>
-    <string name="please_select">Please select a correct file</string>
+    <string name="please_select">Please select or set a correct file</string>
     <string name="file_not_found">File not found</string>
     <string name="please_click_select">Please click the right-top button to select file</string>
     <string name="wrong_audio_format">wrong audio file</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 09680fb..022f3c7 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -90,7 +90,7 @@
     <string name="video_sharp">锐化</string>
 
     <string name="select_file">选择文件</string>
-    <string name="please_select">请选择正确文件</string>
+    <string name="please_select">请选择或设置正确文件</string>
     <string name="file_not_found">文件不存在</string>
     <string name="please_click_select">请点击右上角菜单选择文件</string>
     <string name="wrong_audio_format">非音频文件</string>
diff --git a/doc/JNI_develop_practice.md b/doc/JNI_develop_practice.md
index 1ad6c45..d9c3ada 100644
--- a/doc/JNI_develop_practice.md
+++ b/doc/JNI_develop_practice.md
@@ -6,5 +6,5 @@ JNI是Java本地接口，定义Android从应用代码(以Java或kotlin编程语
 [Android.mk与CMake编译](https://github.com/xufuji456/FFmpegAndroid/blob/master/doc/NDK_compile_shell.md)
 
 ### 相关介绍文章如下：
-[NDK编译脚本](https://blog.csdn.net/u011686167/article/details/106458899)
-[JNI开发规范](https://blog.csdn.net/u011686167/article/details/81784979)
\ No newline at end of file
+[NDK编译脚本](https://blog.csdn.net/u011686167/article/details/106458899)</br>
+[JNI开发规范](https://blog.csdn.net/u011686167/article/details/81784979)</br>
\ No newline at end of file