     case video = 0
     case photo
     case audio
+    case videoWithoutAudio
     
     public var description: String {
         get {
             switch self {
             case .video:
                 return "Video"
+            case .videoWithoutAudio:
+                return "Video without audio"
             case .photo:
                 return "Photo"
             case .audio:

                let _ = self.addAudioOuput()
                let _ = self.addVideoOutput()
                break
            case .photo:
                if session.sessionPreset != self.photoConfiguration.preset {
                    if session.canSetSessionPreset(self.photoConfiguration.preset) {

            } // self._currentDevice
        }
    }

    
    internal func handleAudioOutput(sampleBuffer: CMSampleBuffer, session: NextLevelSession) {
        if session.isAudioReady == false {
