ref: 76567d84cef1bd8a8dd734a70f554d80208a66fd
parent: f7e767d8ee584aabc2074e425186b219d564cce3
author: Cheng Chen <chengchen@google.com>
date: Tue Apr 4 10:39:17 EDT 2017
Speed up encoding by skipping altref recode Speed up for speed 0. Reduce 10+% of encoding time for hdres in speed 0, with less than 0.1% PSNR loss. Compute total difference of previous and current frame context probability model. If the diff is less than the threshold, skip recoding the frame. Borg test (positive number means performance loss): lowres midres hdres PSNR: 0.030 0.032 0.065 Local speed test: bitrate set at 1200 blue_sky pedestrian rush_hour Encoding time: -10.0% -16.5% -16.5% Change-Id: I4e2d200ea3115d48b2c3e890143596b31b8ef9e9