From c9378ff2460a758977c7e3c042dfcd6c02c98af1 Mon Sep 17 00:00:00 2001
From: philippegorley <philippe.gorley@savoirfairelinux.com>
Date: Wed, 19 Jul 2017 09:59:33 -0400
Subject: [PATCH] video: tweak vp8 encoder settings
Changes vp8 encoder settings to better suit live streaming.
Source:
https://www.webmproject.org/docs/encoder-parameters/#real-time-cbr-encoding-and-streaming
Change-Id: Id81dd196b59e58d32b6da6617d805b4df7564bd2
---
src/media/media_encoder.cpp | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/src/media/media_encoder.cpp b/src/media/media_encoder.cpp
index 9d2505a8c0..7698aaf778 100644
--- a/src/media/media_encoder.cpp
+++ b/src/media/media_encoder.cpp
@@ -179,8 +179,12 @@ MediaEncoder::openOutput(const char *filename,
// http://www.webmproject.org/docs/encoder-parameters/
av_opt_set(encoderCtx_->priv_data, "quality", "realtime", 0);
av_opt_set_int(encoderCtx_->priv_data, "error-resilient", 1, 0);
- av_opt_set_int(encoderCtx_->priv_data, "cpu-used", 3, 0);
+ av_opt_set_int(encoderCtx_->priv_data, "cpu-used", 7, 0); // value obtained from testing
av_opt_set_int(encoderCtx_->priv_data, "lag-in-frames", 0, 0);
+ // allow encoder to drop frames if buffers are full and
+ // to undershoot target bitrate to lessen strain on resources
+ av_opt_set_int(encoderCtx_->priv_data, "drop-frame", 25, 0);
+ av_opt_set_int(encoderCtx_->priv_data, "undershoot-pct", 95, 0);
// don't set encoderCtx_->gop_size: let libvpx decide when to insert a keyframe
encoderCtx_->slices = 2; // VP8E_SET_TOKEN_PARTITIONS
encoderCtx_->qmin = 4;
--
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