diff --git a/webrtc/video_engine/include/vie_base.h b/webrtc/video_engine/include/vie_base.h
index 486eca6..0a528cb 100644
--- a/webrtc/video_engine/include/vie_base.h
+++ b/webrtc/video_engine/include/vie_base.h
@@ -69,8 +69,8 @@
         enable_encode_usage_method(false),
         low_encode_usage_threshold_percent(60),
         high_encode_usage_threshold_percent(90),
-        low_encode_time_rsd_threshold(0),
-        high_encode_time_rsd_threshold(0),
+        low_encode_time_rsd_threshold(-1),
+        high_encode_time_rsd_threshold(-1),
         frame_timeout_interval_ms(1500),
         min_frame_samples(120),
         min_process_count(3),
@@ -84,8 +84,12 @@
   bool enable_encode_usage_method;
   int low_encode_usage_threshold_percent;  // Threshold for triggering underuse.
   int high_encode_usage_threshold_percent; // Threshold for triggering overuse.
-  int low_encode_time_rsd_threshold;   // Threshold for triggering underuse.
-  int high_encode_time_rsd_threshold;  // Threshold for triggering overuse.
+  int low_encode_time_rsd_threshold;   // Additional threshold for triggering
+                                       // underuse (used in addition to
+                                       // threshold above if configured).
+  int high_encode_time_rsd_threshold;  // Additional threshold for triggering
+                                       // overuse (used in addition to
+                                       // threshold above if configured).
   // General settings.
   int frame_timeout_interval_ms;  // The maximum allowed interval between two
                                   // frames before resetting estimations.
diff --git a/webrtc/video_engine/overuse_frame_detector.cc b/webrtc/video_engine/overuse_frame_detector.cc
index 4a95103..ac9519f 100644
--- a/webrtc/video_engine/overuse_frame_detector.cc
+++ b/webrtc/video_engine/overuse_frame_detector.cc
@@ -38,7 +38,7 @@
 const int kQuickRampUpDelayMs = 10 * 1000;
 // Delay between rampup attempts. Initially uses standard, scales up to max.
 const int kStandardRampUpDelayMs = 30 * 1000;
-const int kMaxRampUpDelayMs = 120 * 1000;
+const int kMaxRampUpDelayMs = 240 * 1000;
 // Expontential back-off factor, to prevent annoying up-down behaviour.
 const double kRampUpBackoffFactor = 2.0;
 
@@ -126,7 +126,7 @@
     filtered_encode_time_ms_->Apply(exp, encode_time_ms);
   }
 
-  int filtered_encode_time_ms() const {
+  int Value() const {
     return static_cast<int>(filtered_encode_time_ms_->Value() + 0.5);
   }
 
@@ -175,7 +175,7 @@
     filtered_encode_time_ms_->Apply(exp, encode_time_ms);
   }
 
-  int UsageInPercent() const {
+  int Value() const {
     if (count_ < static_cast<uint32_t>(options_.min_frame_samples)) {
       return static_cast<int>(InitialUsageInPercent() + 0.5f);
     }
@@ -186,6 +186,7 @@
     return static_cast<int>(encode_usage_percent + 0.5);
   }
 
+ private:
   float InitialUsageInPercent() const {
     // Start in between the underuse and overuse threshold.
     return (options_.low_encode_usage_threshold_percent +
@@ -196,7 +197,6 @@
     return InitialUsageInPercent() * kInitialSampleDiffMs / 100;
   }
 
- private:
   const float kWeightFactorFrameDiff;
   const float kWeightFactorEncodeTime;
   const float kInitialSampleDiffMs;
@@ -295,13 +295,13 @@
     return static_cast<int>(filtered_rsd_->Value() + 0.5);
   }
 
+ private:
   float InitialValue() const {
     // Start in between the underuse and overuse threshold.
-    return (options_.low_encode_time_rsd_threshold +
-            options_.high_encode_time_rsd_threshold) / 2.0f;
+    return std::max(((options_.low_encode_time_rsd_threshold +
+                      options_.high_encode_time_rsd_threshold) / 2.0f), 0.0f);
   }
 
- private:
   const float kWeightFactor;
   uint32_t count_;  // Number of encode samples since last reset.
   CpuOveruseOptions options_;
@@ -358,7 +358,7 @@
     return delay_ms_;
   }
 
-  int filtered_delay_ms_per_s() const {
+  int Value() const {
     return static_cast<int>(filtered_delay_ms_per_s_->Value() + 0.5);
   }
 
@@ -419,11 +419,10 @@
     CpuOveruseMetrics* metrics) const {
   CriticalSectionScoped cs(crit_.get());
   metrics->capture_jitter_ms = static_cast<int>(capture_deltas_.StdDev() + 0.5);
-  metrics->avg_encode_time_ms = encode_time_->filtered_encode_time_ms();
+  metrics->avg_encode_time_ms = encode_time_->Value();
   metrics->encode_rsd = encode_rsd_->Value();
-  metrics->encode_usage_percent = encode_usage_->UsageInPercent();
-  metrics->capture_queue_delay_ms_per_s =
-      capture_queue_delay_->filtered_delay_ms_per_s();
+  metrics->encode_usage_percent = encode_usage_->Value();
+  metrics->capture_queue_delay_ms_per_s = capture_queue_delay_->Value();
 }
 
 int32_t OveruseFrameDetector::TimeUntilNextProcess() {
@@ -544,7 +543,7 @@
       in_quick_rampup_ ? kQuickRampUpDelayMs : current_rampup_delay_ms_;
   LOG(LS_INFO) << " Frame stats: capture avg: " << capture_deltas_.Mean()
                << " capture stddev " << capture_deltas_.StdDev()
-               << " encode usage " << encode_usage_->UsageInPercent()
+               << " encode usage " << encode_usage_->Value()
                << " encode rsd " << encode_rsd_->Value()
                << " rampup delay " << rampup_delay;
   return 0;
@@ -556,8 +555,14 @@
     overusing = capture_deltas_.StdDev() >=
         options_.high_capture_jitter_threshold_ms;
   } else if (options_.enable_encode_usage_method) {
-    overusing = encode_usage_->UsageInPercent() >=
-        options_.high_encode_usage_threshold_percent;
+    bool encode_usage_overuse =
+        encode_usage_->Value() >= options_.high_encode_usage_threshold_percent;
+    bool encode_rsd_overuse = false;
+    if (options_.high_encode_time_rsd_threshold > 0) {
+      encode_rsd_overuse =
+          (encode_rsd_->Value() >= options_.high_encode_time_rsd_threshold);
+    }
+    overusing = encode_usage_overuse || encode_rsd_overuse;
   }
 
   if (overusing) {
@@ -578,8 +583,14 @@
     underusing = capture_deltas_.StdDev() <
         options_.low_capture_jitter_threshold_ms;
   } else if (options_.enable_encode_usage_method) {
-    underusing = encode_usage_->UsageInPercent() <
-        options_.low_encode_usage_threshold_percent;
+    bool encode_usage_underuse =
+        encode_usage_->Value() < options_.low_encode_usage_threshold_percent;
+    bool encode_rsd_underuse = true;
+    if (options_.low_encode_time_rsd_threshold > 0) {
+      encode_rsd_underuse =
+          (encode_rsd_->Value() < options_.low_encode_time_rsd_threshold);
+    }
+    underusing = encode_usage_underuse && encode_rsd_underuse;
   }
   return underusing;
 }
diff --git a/webrtc/video_engine/overuse_frame_detector_unittest.cc b/webrtc/video_engine/overuse_frame_detector_unittest.cc
index 2d7116f..4e5d4bd 100644
--- a/webrtc/video_engine/overuse_frame_detector_unittest.cc
+++ b/webrtc/video_engine/overuse_frame_detector_unittest.cc
@@ -71,6 +71,12 @@
              options_.high_encode_usage_threshold_percent) / 2.0f) + 0.5;
   }
 
+  int InitialEncodeRsd() {
+    return std::max(
+        ((options_.low_encode_time_rsd_threshold +
+          options_.high_encode_time_rsd_threshold) / 2.0f) + 0.5f, 0.0f);
+  }
+
   void InsertFramesWithInterval(
       size_t num_frames, int interval_ms, int width, int height) {
     while (num_frames-- > 0) {
@@ -111,7 +117,19 @@
     }
   }
 
-  void TriggerNormalUsageWithEncodeUsage() {
+  void TriggerOveruseWithEncodeRsd(int num_times) {
+    const int kEncodeTimeMs1 = 10;
+    const int kEncodeTimeMs2 = 25;
+    for (int i = 0; i < num_times; ++i) {
+      InsertAndEncodeFramesWithInterval(
+          200, kFrameInterval33ms, kWidth, kHeight, kEncodeTimeMs1);
+      InsertAndEncodeFramesWithInterval(
+          10, kFrameInterval33ms, kWidth, kHeight, kEncodeTimeMs2);
+      overuse_detector_->Process();
+    }
+  }
+
+  void TriggerNormalUsageWithEncodeTime() {
     const int kEncodeTimeMs = 5;
     InsertAndEncodeFramesWithInterval(
         1000, kFrameInterval33ms, kWidth, kHeight, kEncodeTimeMs);
@@ -136,25 +154,37 @@
     return metrics.encode_usage_percent;
   }
 
+  int EncodeRsd() {
+    CpuOveruseMetrics metrics;
+    overuse_detector_->GetCpuOveruseMetrics(&metrics);
+    return metrics.encode_rsd;
+  }
+
   CpuOveruseOptions options_;
   scoped_ptr<SimulatedClock> clock_;
   scoped_ptr<MockCpuOveruseObserver> observer_;
   scoped_ptr<OveruseFrameDetector> overuse_detector_;
 };
 
+// enable_capture_jitter_method = true;
+// CaptureJitterMs() > high_capture_jitter_threshold_ms => overuse.
+// CaptureJitterMs() < low_capture_jitter_threshold_ms => underuse.
 TEST_F(OveruseFrameDetectorTest, TriggerOveruse) {
+  // capture_jitter > high => overuse
   EXPECT_CALL(*(observer_.get()), OveruseDetected()).Times(1);
   TriggerOveruse(options_.high_threshold_consecutive_count);
 }
 
 TEST_F(OveruseFrameDetectorTest, OveruseAndRecover) {
+  // capture_jitter > high => overuse
   EXPECT_CALL(*(observer_.get()), OveruseDetected()).Times(1);
   TriggerOveruse(options_.high_threshold_consecutive_count);
+  // capture_jitter < low => underuse
   EXPECT_CALL(*(observer_.get()), NormalUsage()).Times(testing::AtLeast(1));
   TriggerNormalUsage();
 }
 
-TEST_F(OveruseFrameDetectorTest, OveruseAndRecoverNoObserver) {
+TEST_F(OveruseFrameDetectorTest, OveruseAndRecoverWithNoObserver) {
   overuse_detector_->SetObserver(NULL);
   EXPECT_CALL(*(observer_.get()), OveruseDetected()).Times(0);
   TriggerOveruse(options_.high_threshold_consecutive_count);
@@ -162,8 +192,9 @@
   TriggerNormalUsage();
 }
 
-TEST_F(OveruseFrameDetectorTest, OveruseAndRecoverDisabled) {
+TEST_F(OveruseFrameDetectorTest, OveruseAndRecoverWithMethodDisabled) {
   options_.enable_capture_jitter_method = false;
+  options_.enable_encode_usage_method = false;
   overuse_detector_->SetOptions(options_);
   EXPECT_CALL(*(observer_.get()), OveruseDetected()).Times(0);
   TriggerOveruse(options_.high_threshold_consecutive_count);
@@ -221,6 +252,7 @@
   EXPECT_GT(metrics.avg_encode_time_ms, 0);
   EXPECT_GT(metrics.encode_usage_percent, 0);
   EXPECT_GE(metrics.capture_queue_delay_ms_per_s, 0);
+  EXPECT_GE(metrics.encode_rsd, 0);
 }
 
 TEST_F(OveruseFrameDetectorTest, CaptureJitter) {
@@ -332,7 +364,7 @@
   const int kEncodeTimeMs = 5;
   InsertAndEncodeFramesWithInterval(
       1000, kFrameInterval33ms, kWidth, kHeight, kEncodeTimeMs);
-  EXPECT_EQ(15, EncodeUsagePercent());
+  EXPECT_EQ(kEncodeTimeMs * 100 / kFrameInterval33ms, EncodeUsagePercent());
 }
 
 TEST_F(OveruseFrameDetectorTest, EncodeUsageResetAfterChangingThreshold) {
@@ -345,10 +377,14 @@
   EXPECT_EQ(InitialEncodeUsage(), EncodeUsagePercent());
 }
 
+// enable_encode_usage_method = true;
+// EncodeUsagePercent() > high_encode_usage_threshold_percent => overuse.
+// EncodeUsagePercent() < low_encode_usage_threshold_percent => underuse.
 TEST_F(OveruseFrameDetectorTest, TriggerOveruseWithEncodeUsage) {
   options_.enable_capture_jitter_method = false;
   options_.enable_encode_usage_method = true;
   overuse_detector_->SetOptions(options_);
+  // usage > high => overuse
   EXPECT_CALL(*(observer_.get()), OveruseDetected()).Times(1);
   TriggerOveruseWithEncodeUsage(options_.high_threshold_consecutive_count);
 }
@@ -357,9 +393,94 @@
   options_.enable_capture_jitter_method = false;
   options_.enable_encode_usage_method = true;
   overuse_detector_->SetOptions(options_);
+  // usage > high => overuse
   EXPECT_CALL(*(observer_.get()), OveruseDetected()).Times(1);
   TriggerOveruseWithEncodeUsage(options_.high_threshold_consecutive_count);
+  // usage < low => underuse
   EXPECT_CALL(*(observer_.get()), NormalUsage()).Times(testing::AtLeast(1));
-  TriggerNormalUsageWithEncodeUsage();
+  TriggerNormalUsageWithEncodeTime();
+}
+
+TEST_F(OveruseFrameDetectorTest,
+       OveruseAndRecoverWithEncodeUsageMethodDisabled) {
+  options_.enable_capture_jitter_method = false;
+  options_.enable_encode_usage_method = false;
+  overuse_detector_->SetOptions(options_);
+  // usage > high => overuse
+  EXPECT_CALL(*(observer_.get()), OveruseDetected()).Times(0);
+  TriggerOveruseWithEncodeUsage(options_.high_threshold_consecutive_count);
+  // usage < low => underuse
+  EXPECT_CALL(*(observer_.get()), NormalUsage()).Times(0);
+  TriggerNormalUsageWithEncodeTime();
+}
+
+TEST_F(OveruseFrameDetectorTest, EncodeRsdResetAfterChangingThreshold) {
+  EXPECT_EQ(InitialEncodeRsd(), EncodeRsd());
+  options_.high_encode_time_rsd_threshold = 100;
+  overuse_detector_->SetOptions(options_);
+  EXPECT_EQ(InitialEncodeRsd(), EncodeRsd());
+  options_.low_encode_time_rsd_threshold = 20;
+  overuse_detector_->SetOptions(options_);
+  EXPECT_EQ(InitialEncodeRsd(), EncodeRsd());
+}
+
+// enable_encode_usage_method = true;
+// low/high_encode_time_rsd_threshold >= 0
+// EncodeUsagePercent() > high_encode_usage_threshold_percent ||
+// EncodeRsd() > high_encode_time_rsd_threshold => overuse.
+// EncodeUsagePercent() < low_encode_usage_threshold_percent &&
+// EncodeRsd() < low_encode_time_rsd_threshold => underuse.
+TEST_F(OveruseFrameDetectorTest, TriggerOveruseWithEncodeRsd) {
+  options_.enable_capture_jitter_method = false;
+  options_.enable_encode_usage_method = true;
+  options_.high_encode_time_rsd_threshold = 80;
+  overuse_detector_->SetOptions(options_);
+  // rsd > high, usage < high => overuse
+  EXPECT_CALL(*(observer_.get()), OveruseDetected()).Times(1);
+  TriggerOveruseWithEncodeRsd(options_.high_threshold_consecutive_count);
+  EXPECT_LT(EncodeUsagePercent(), options_.high_encode_usage_threshold_percent);
+}
+
+TEST_F(OveruseFrameDetectorTest, OveruseAndRecoverWithEncodeRsd) {
+  options_.enable_capture_jitter_method = false;
+  options_.enable_encode_usage_method = true;
+  options_.low_encode_time_rsd_threshold = 20;
+  options_.high_encode_time_rsd_threshold = 80;
+  overuse_detector_->SetOptions(options_);
+  // rsd > high, usage < high => overuse
+  EXPECT_CALL(*(observer_.get()), OveruseDetected()).Times(1);
+  TriggerOveruseWithEncodeRsd(options_.high_threshold_consecutive_count);
+  EXPECT_LT(EncodeUsagePercent(), options_.high_encode_usage_threshold_percent);
+  // rsd < low, usage < low => underuse
+  EXPECT_CALL(*(observer_.get()), NormalUsage()).Times(testing::AtLeast(1));
+  TriggerNormalUsageWithEncodeTime();
+}
+
+TEST_F(OveruseFrameDetectorTest, NoUnderuseWithEncodeRsd_UsageGtLowThreshold) {
+  options_.enable_capture_jitter_method = false;
+  options_.enable_encode_usage_method = true;
+  options_.low_encode_usage_threshold_percent = 1;
+  options_.low_encode_time_rsd_threshold = 20;
+  options_.high_encode_time_rsd_threshold = 90;
+  overuse_detector_->SetOptions(options_);
+  // rsd < low, usage > low => no underuse
+  EXPECT_CALL(*(observer_.get()), NormalUsage()).Times(0);
+  TriggerNormalUsageWithEncodeTime();
+  EXPECT_LT(EncodeRsd(), options_.low_encode_time_rsd_threshold);
+  EXPECT_GT(EncodeUsagePercent(), options_.low_encode_usage_threshold_percent);
+}
+
+TEST_F(OveruseFrameDetectorTest, NoUnderuseWithEncodeRsd_RsdGtLowThreshold) {
+  options_.enable_capture_jitter_method = false;
+  options_.enable_encode_usage_method = true;
+  options_.low_encode_usage_threshold_percent = 20;
+  options_.low_encode_time_rsd_threshold = 1;
+  options_.high_encode_time_rsd_threshold = 90;
+  overuse_detector_->SetOptions(options_);
+  // rsd > low, usage < low => no underuse
+  EXPECT_CALL(*(observer_.get()), NormalUsage()).Times(0);
+  TriggerNormalUsageWithEncodeTime();
+  EXPECT_GT(EncodeRsd(), options_.low_encode_time_rsd_threshold);
+  EXPECT_LT(EncodeUsagePercent(), options_.low_encode_usage_threshold_percent);
 }
 }  // namespace webrtc