RRF camera tag in Android app

I am testing my android app on Android Mediacom device and some other devices. When I try to stream content via RTSP , I see this message repeated in the tag in Logcat and streaming doesn't start:

...

RRF
camera RRF
camera RRF
camera RRF
camera RRF camera
...

I can't find anything on the net about this tag ... Does anyone know how to deal with this problem?