In screenshare mode, suppress VP8 bitrate overshoot and increase quality

webrtc/video/screenshare_loopback.cc

 /*
  *  Copyright (c) 2015 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.
  */
 
@@ skipping 27 matching lines @@
 DEFINE_int32(fps, 5, "Frames per second.");
 int Fps() {
   return static_cast<int>(FLAGS_fps);
 }
 
 DEFINE_int32(min_bitrate, 50, "Minimum video bitrate.");
 size_t MinBitrate() {
   return static_cast<size_t>(FLAGS_min_bitrate);
 }
 
-DEFINE_int32(tl0_bitrate, 100, "Temporal layer 0 target bitrate.");
+DEFINE_int32(tl0_bitrate, 200, "Temporal layer 0 target bitrate.");
 size_t StartBitrate() {
   return static_cast<size_t>(FLAGS_tl0_bitrate);
 }
 
-DEFINE_int32(tl1_bitrate, 1000, "Temporal layer 1 target bitrate.");
+DEFINE_int32(tl1_bitrate, 2000, "Temporal layer 1 target bitrate.");
 size_t MaxBitrate() {
   return static_cast<size_t>(FLAGS_tl1_bitrate);
 }
 
 DEFINE_int32(min_transmit_bitrate, 400, "Min transmit bitrate incl. padding.");
 int MinTransmitBitrate() {
   return FLAGS_min_transmit_bitrate;
 }
 
 DEFINE_string(codec, "VP8", "Video codec to use.");
@@ skipping 108 matching lines @@
 }  // namespace webrtc
 
 int main(int argc, char* argv[]) {
   ::testing::InitGoogleTest(&argc, argv);
   google::ParseCommandLineFlags(&argc, &argv, true);
   webrtc::test::InitFieldTrialsFromString(
       webrtc::flags::FLAGS_force_fieldtrials);
   webrtc::test::RunTest(webrtc::Loopback);
   return 0;
 }