diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 44d5f8b..dfe28bd 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -10,9 +10,11 @@
     <uses-permission android:name="android.permission.RECORD_AUDIO" />
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
+    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
 
     <uses-feature android:name="android.hardware.camera" />
     <uses-feature android:name="android.hardware.camera.autofocus" />
+    <uses-feature android:name="android.hardware.audio.output" android:required="true" />
 
     <application
         android:name=".FFmpegApplication"
diff --git a/app/src/main/java/com/frank/ffmpeg/activity/MainActivity.kt b/app/src/main/java/com/frank/ffmpeg/activity/MainActivity.kt
index 5112390..b1555e9 100644
--- a/app/src/main/java/com/frank/ffmpeg/activity/MainActivity.kt
+++ b/app/src/main/java/com/frank/ffmpeg/activity/MainActivity.kt
@@ -2,13 +2,11 @@ package com.frank.ffmpeg.activity
 
 import android.content.Intent
 import android.os.Bundle
-import android.util.Log
 import android.view.View
 import androidx.recyclerview.widget.RecyclerView
 import androidx.recyclerview.widget.StaggeredGridLayoutManager
 
 import com.frank.ffmpeg.R
-import com.frank.ffmpeg.VideoPlayer
 import com.frank.ffmpeg.adapter.WaterfallAdapter
 import com.frank.ffmpeg.listener.OnItemClickListener