ref: f058688eaa8b9fb2ff1f4d92eb02cf888fd28ec0
parent: 3f7e6cc020446ee29439f1cd7d3d5c39adaf64c0
author: Jerome Jiang <jianj@google.com>
date: Fri Jun 1 10:27:34 EDT 2018
vp9-svc: Allow usage of second (long term) temporal reference. Allow for second temporal reference for top spatial layer in SVC, when inter-layer prediction is disabled on INTER frames. The second temporal reference is labelled as the golden reference and the update/refresh of this reference buffer is only on base temporal layer superframes. For now the period of refresh is fixed at every 20 TL0 superframes. Average gain is ~4% on RTC set, several clips up by ~8-12%. Speed loss is about ~2% on mac. Feature is disabled as default for now. Change-Id: I2e5db5052c62dbe958a3b14be97d043823b7a529