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Tune QP thresholds for HW H.264 encoder.

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Boost low QP threashold to 21, otherwise VGA encoding never
scales up even at 2.5 Mbps.
Also reduce high QP threshold to scale down faster.

BUG=b/26504665
R=jackychen@google.com

Review URL: https://codereview.webrtc.org/1717763003 .

Cr-Commit-Position: refs/heads/master@{#11712}
This commit is contained in:
Alex Glaznev 2016-02-22 15:05:15 -08:00
parent 18f9ddd7b3
commit 67b81f92f4
1 changed files with 2 additions and 2 deletions
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4
webrtc/api/java/jni/androidmediaencoder_jni.cc
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@ -387,8 +387,8 @@ int32_t MediaCodecVideoEncoder::InitEncode(
codec_settings->width, codec_settings->height);
} else if (codecType_ == kVideoCodecH264) {
// H264 QP is in the range [0, 51].
const int kLowQpThreshold = 17;
const int kBadQpThreshold = 40;
const int kLowQpThreshold = 21;
const int kBadQpThreshold = 36;
quality_scaler_.Init(kLowQpThreshold, kBadQpThreshold, false,
codec_settings->startBitrate,
codec_settings->width, codec_settings->height);