Rate limit the low bandwidth / min bitrate warning to once every 10 seconds.

webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  *
  *  FEC and NACK added bitrate is handled outside class
@@ skipping 12 matching lines @@
  public:
   SendSideBandwidthEstimation();
   virtual ~SendSideBandwidthEstimation();
 
   void CurrentEstimate(int* bitrate, uint8_t* loss, int64_t* rtt) const;
 
   // Call periodically to update estimate.
   void UpdateEstimate(int64_t now_ms);
 
   // Call when we receive a RTCP message with TMMBR or REMB.
-  void UpdateReceiverEstimate(uint32_t bandwidth);
+  void UpdateReceiverEstimate(int64_t now_ms, uint32_t bandwidth);
 
   // Call when we receive a RTCP message with a ReceiveBlock.
   void UpdateReceiverBlock(uint8_t fraction_loss,
                            int64_t rtt,
                            int number_of_packets,
                            int64_t now_ms);
 
   void SetSendBitrate(int bitrate);
   void SetMinMaxBitrate(int min_bitrate, int max_bitrate);
   int GetMinBitrate() const;
 
  private:
   enum UmaState { kNoUpdate, kFirstDone, kDone };
 
   bool IsInStartPhase(int64_t now_ms) const;
 
   void UpdateUmaStats(int64_t now_ms, int64_t rtt, int lost_packets);
 
   // Returns the input bitrate capped to the thresholds defined by the max,
   // min and incoming bandwidth.
-  uint32_t CapBitrateToThresholds(uint32_t bitrate);
+  uint32_t CapBitrateToThresholds(int64_t now_ms, uint32_t bitrate);
 
   // Updates history of min bitrates.
   // After this method returns min_bitrate_history_.front().second contains the
   // min bitrate used during last kBweIncreaseIntervalMs.
   void UpdateMinHistory(int64_t now_ms);
 
   std::deque<std::pair<int64_t, uint32_t> > min_bitrate_history_;
 
   // incoming filters
   int accumulate_lost_packets_Q8_;
   int accumulate_expected_packets_;
 
   uint32_t bitrate_;
   uint32_t min_bitrate_configured_;
   uint32_t max_bitrate_configured_;
+  int64_t last_low_bitrate_log_ms_;
 
   int64_t time_last_receiver_block_ms_;
   uint8_t last_fraction_loss_;
   int64_t last_round_trip_time_ms_;
 
   uint32_t bwe_incoming_;
   int64_t time_last_decrease_ms_;
   int64_t first_report_time_ms_;
   int initially_lost_packets_;
   int bitrate_at_2_seconds_kbps_;
   UmaState uma_update_state_;
   std::vector<bool> rampup_uma_stats_updated_;
 };
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_BITRATE_CONTROLLER_SEND_SIDE_BANDWIDTH_ESTIMATION_H_