fix

iOSClient/Viewer/NCViewerMedia/NCPlayer/NCPlayer.swift

@@ -217,6 +217,7 @@ extension NCPlayer: VLCMediaPlayerDelegate {
             }
             self.width = Int(size.width)
             self.height = Int(size.height)
+            playerToolBar?.updateTopToolBar(videoSubTitlesIndexes: player.videoSubTitlesIndexes, audioTrackIndexes: player.audioTrackIndexes)
             NCManageDatabase.shared.addVideo(metadata: metadata, width: self.width, height: self.height, length: self.length)
             print("Played mode: PLAYING")
             break

iOSClient/Viewer/NCViewerMedia/NCPlayer/NCPlayerToolBar.swift

@@ -94,8 +94,10 @@ class NCPlayerToolBar: UIView {
         playButton.setImage(NCUtility.shared.loadImage(named: "play.fill", color: .white, symbolConfiguration: UIImage.SymbolConfiguration(pointSize: 30)), for: .normal)
 
         subtitleButton.setImage(NCUtility.shared.loadImage(named: "captions.bubble", color: .white), for: .normal)
-
+        subtitleButton.isEnabled = false
+        
         audioButton.setImage(NCUtility.shared.loadImage(named: "speaker.zzz", color: .white), for: .normal)
+        audioButton.isEnabled = false
 
         backButton.setImage(NCUtility.shared.loadImage(named: "gobackward.10", color: .white), for: .normal)
 
@@ -164,6 +166,12 @@ class NCPlayerToolBar: UIView {
         MPNowPlayingInfoCenter.default().nowPlayingInfo?[MPNowPlayingInfoPropertyElapsedPlaybackTime] = positionInSecond
     }
 
+    public func updateTopToolBar(videoSubTitlesIndexes: [Any], audioTrackIndexes: [Any]) {
+
+        self.subtitleButton.isEnabled = !videoSubTitlesIndexes.isEmpty
+        self.audioButton.isEnabled = !audioTrackIndexes.isEmpty
+    }
+
     // MARK: -
 
     public func show() {