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In screenshare mode, suppress VP8 bitrate overshoot and increase quality

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This change includes several improvements:

* VP8 configured with new rate control
* Detection of frame dropping, with qp bump for next frame
* Increased target and TL0 bitrates
* Reworked rate control (TL allocation) in screenshare_layers

A note on performance: PSNR and SSIM is expected to get slightly worse with this cl. Frame drops and delays should however improve.

BUG=4171
R=pbos@webrtc.org, stefan@webrtc.org

Review URL: https://codereview.webrtc.org/1193513006.

Cr-Commit-Position: refs/heads/master@{#9495}
This commit is contained in:
Erik Språng
2015-06-24 11:24:44 +02:00
parent 7ab5f801dd
commit 2c4c914819
16 changed files with 610 additions and 294 deletions
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2
talk/media/webrtc/simulcast.cc
View File

@@ -411,7 +411,7 @@ void LogSimulcastSubstreams(const webrtc::VideoCodec& codec) {
static const int kScreenshareMinBitrateKbps = 50;
static const int kScreenshareMaxBitrateKbps = 6000;
static const int kScreenshareDefaultTl0BitrateKbps = 100;
static const int kScreenshareDefaultTl0BitrateKbps = 200;
static const int kScreenshareDefaultTl1BitrateKbps = 1000;
static const char* kScreencastLayerFieldTrialName =

3
talk/media/webrtc/webrtcvideoengine2_unittest.cc
View File

@@ -1438,7 +1438,8 @@ TEST_F(WebRtcVideoChannel2Test, UsesCorrectSettingsForScreencast) {
TEST_F(WebRtcVideoChannel2Test,
ConferenceModeScreencastConfiguresTemporalLayer) {
static const int kConferenceScreencastTemporalBitrateBps = 100000;
static const int kConferenceScreencastTemporalBitrateBps =
ScreenshareLayerConfig::GetDefault().tl0_bitrate_kbps * 1000;
VideoOptions options;
options.conference_mode.Set(true);
channel_->SetOptions(options);