[mirotalksfu] - change scalability mode

public/js/RoomClient.js

@@ -187,14 +187,15 @@ class RoomClient {
         this.chunkSize = 1024 * 16; // 16kb/s
 
         // Encodings
+        // https://www.w3.org/TR/webrtc-svc/#scalabilitymodes*
         this.forceVP8 = false; // Force VP8 codec for webcam and screen sharing
         this.forceVP9 = false; // Force VP9 codec for webcam and screen sharing
         this.forceH264 = false; // Force H264 codec for webcam and screen sharing
         this.enableWebcamLayers = true; // Enable simulcast or SVC for webcam
         this.enableSharingLayers = false; // Enable simulcast or SVC for screen sharing
         this.numSimulcastStreams = 3; // Number of streams for simulcast in webcam and screen sharing
-        this.webcamScalabilityMode = 'L3T3'; // Scalability Mode for webcam | 'L1T3' for VP8/H264 (in each simulcast encoding), 'L3T3_KEY' for VP9
-        this.sharingScalabilityMode = 'L3T3'; // Scalability Mode for screen sharing | 'L1T3' for VP8/H264 (in each simulcast encoding), 'L3T3' for VP9
+        this.webcamScalabilityMode = ''; // Scalability Mode for webcam | 'L1T3' for VP8/H264 (in each simulcast encoding), 'L3T3_KEY' for VP9
+        this.sharingScalabilityMode = ''; // Scalability Mode for screen sharing | 'L1T3' for VP8/H264 (in each simulcast encoding), 'L3T3' for VP9
 
         this.myVideoEl = null;
         this.myAudioEl = null;