Auto pause video streams based on encoder target bitrate.

webrtc/video/video_loopback.cc

Index: webrtc/video/video_loopback.cc
diff --git a/webrtc/video/video_loopback.cc b/webrtc/video/video_loopback.cc
index 1622e6ad86c26d68bcc2177545eaf266eca84521..f3e13de34673466c475b16d51bad309390572d56 100644
--- a/webrtc/video/video_loopback.cc
+++ b/webrtc/video/video_loopback.cc
@@ -56,6 +56,10 @@ int MaxBitrateKbps() {
   return static_cast<int>(FLAGS_max_bitrate);
 }
 
+DEFINE_bool(suspend_below_min_bitrate,
+            false,
+            "Suspends video below the configured min bitrate.");
+
 DEFINE_int32(num_temporal_layers,
              1,
              "Number of temporal layers. Set to 1-4 to override.");
@@ -223,7 +227,9 @@ void Loopback() {
   VideoQualityTest::Params params{
       {flags::Width(), flags::Height(), flags::Fps(),
        flags::MinBitrateKbps() * 1000, flags::TargetBitrateKbps() * 1000,
-       flags::MaxBitrateKbps() * 1000, flags::Codec(),
+       flags::MaxBitrateKbps() * 1000,
+       flags::FLAGS_suspend_below_min_bitrate,
+       flags::Codec(),
        flags::NumTemporalLayers(), flags::SelectedTL(),
        0,  // No min transmit bitrate.
        call_bitrate_config,