FS-7500: clock in 15fps for now

src/switch_core_media.c

@@ -1947,8 +1947,8 @@ static void check_jb_sync(switch_core_session_t *session)
 			jb_sync_msec = tmp;
 		}
 	}
-
-	fps = switch_core_media_get_video_fps(session);
+	// TBD IMPROVE get_fps func
+	fps = 15; //switch_core_media_get_video_fps(session);
 	
 	if (!fps) return;