anchor.diff:    MediaStream get srcObject => _srcObject;
   
     set srcObject(MediaStream stream) {
  +    if (videoElement == null) throw 'Call initialize before setting the stream';
  +
       if (stream == null) {
         videoElement.srcObject = null;
         _srcObject = null;
  
positive.code:   }
  }
  
  class RTCVideoView extends StatelessWidget {
    RTCVideoView(
      this._renderer, {
      Key key,
  
negative.code:     _srcObject = stream;
      videoElement.srcObject = stream?.jsStream;
      videoElement.muted = stream?.ownerTag == 'local';
      value = value.copyWith(renderVideo: renderVideo);
    }
  
    @override
  