ref: 9a7625652c94ab2d699cb1066ba6de24ceea3cfa
parent: 8053dba5a1470a9ced7236f5b692b16f0d7b8a98
author: paulwilkins <paulwilkins@google.com>
date: Wed May 10 12:07:13 EDT 2017
Tuning of factor used to calculate Q range in two pass. A more detailed explanation of the experimentation leading to this change can be found in:- https://docs.google.com/a/google.com/document/d/13lsYhxgPyxUHvEess6wg9nikaonIZKY9Ak_Lpafv5Mo/edit?usp=sharing This change gives gains across all our standard test sets for overall psnr, ssim, fast ssim and psnr-HVS. Values expressed as % reduction in bitrate. Low res set -0.257, -0.192, -0.173, -0.101 Mid res set -0.233, -0.336, -0.367, -0.139 High res set -0.999, -1.039, -1.111, -0.567 NetFlix 2K set -0.734, -0.174, -0.389, -0.820 Netflix 4K set -0.814, -0.485, -0.796, -0.839 Change-Id: Ie981fb3c895c9dfcfc8682640d201a86375db5c8