Use ExoPlayer 2.11.3 (no need for submodule anymore)

.idea/gradle.xml

         <option name="modules">
           <set>
             <option value="$PROJECT_DIR$" />
-            <option value="$PROJECT_DIR$/ExoPlayer/extensions/av1" />
-            <option value="$PROJECT_DIR$/ExoPlayer/extensions/cast" />
-            <option value="$PROJECT_DIR$/ExoPlayer/extensions/cronet" />
-            <option value="$PROJECT_DIR$/ExoPlayer/extensions/ffmpeg" />
-            <option value="$PROJECT_DIR$/ExoPlayer/extensions/flac" />
-            <option value="$PROJECT_DIR$/ExoPlayer/extensions/gvr" />
-            <option value="$PROJECT_DIR$/ExoPlayer/extensions/ima" />
-            <option value="$PROJECT_DIR$/ExoPlayer/extensions/jobdispatcher" />
-            <option value="$PROJECT_DIR$/ExoPlayer/extensions/leanback" />
-            <option value="$PROJECT_DIR$/ExoPlayer/extensions/mediasession" />
-            <option value="$PROJECT_DIR$/ExoPlayer/extensions/okhttp" />
-            <option value="$PROJECT_DIR$/ExoPlayer/extensions/opus" />
-            <option value="$PROJECT_DIR$/ExoPlayer/extensions/rtmp" />
-            <option value="$PROJECT_DIR$/ExoPlayer/extensions/vp9" />
-            <option value="$PROJECT_DIR$/ExoPlayer/extensions/workmanager" />
-            <option value="$PROJECT_DIR$/ExoPlayer/library/all" />
-            <option value="$PROJECT_DIR$/ExoPlayer/library/core" />
-            <option value="$PROJECT_DIR$/ExoPlayer/library/dash" />
-            <option value="$PROJECT_DIR$/ExoPlayer/library/hls" />
-            <option value="$PROJECT_DIR$/ExoPlayer/library/smoothstreaming" />
-            <option value="$PROJECT_DIR$/ExoPlayer/library/ui" />
-            <option value="$PROJECT_DIR$/ExoPlayer/testutils" />
             <option value="$PROJECT_DIR$/app" />
           </set>
         </option>

.idea/vcs.xml

 <project version="4">
   <component name="VcsDirectoryMappings">
     <mapping directory="" vcs="Git" />
-    <mapping directory="$PROJECT_DIR$/ExoPlayer" vcs="Git" />
   </component>
 </project>

ExoPlayer

-Subproject commit 24a19264dbf35e326bbd7bb36c232eb180e1e26d

app/build.gradle

      */
 
     implementation "androidx.media:media:1.1.0"
-    //implementation 'com.google.android.exoplayer:exoplayer:2.11.1'
-    implementation project(':exoplayer-library') // uses local ExoPlayer clone, from dev-v2 branch (fixes ISO-8859-1 ICY metadata
+    implementation 'com.google.android.exoplayer:exoplayer:2.11.3'
+    //implementation project(':exoplayer-library') // uses local ExoPlayer clone, from dev-v2 branch (fixes ISO-8859-1 ICY metadata
 
-    implementation 'androidx.lifecycle:lifecycle-extensions:2.1.0'
-    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.1.0'
+    implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
+    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.2.0'
 
     implementation 'androidx.recyclerview:recyclerview:1.1.0'
     implementation 'androidx.preference:preference:1.1.0'

settings.gradle

 include ':app'
 rootProject.name='Tsumugi-app'
-
-gradle.ext.exoplayerRoot = './ExoPlayer'
-gradle.ext.exoplayerModulePrefix = 'exoplayer-'
-apply from: new File(gradle.ext.exoplayerRoot, 'core_settings.gradle')