commit e89ca180c280e0fe1ac8b74d6ab243eeff9379e3
author Zoe Liu <zoeliu@google.com> Wed May 25 11:57:15 2016 -0700
committer Zoe Liu <zoeliu@google.com> Sat May 28 16:46:45 2016 -0700
tree 979dc494169241d494641870c8689c9e38ec8657
parent 6fd7f7dd3e3e0ef23956cdf5fb92a005de290fa6

Make the bi-predictive frame group interval adjustable

This is for the bidir-pred experiment. Previously the length of the
bi-predictive frame group interval is fixed at 2, i.e. one
bi-predictive frame may be inserted every other frame. This patch
makes the length adjustable, i.e. any positive number may be
specified, but the use of the backward ref will be turned off if the
bi-predictive frame group interval is larger than the golden frame
group.

Further, an additional rate factor level has been added:
INTER_LOW
, which applies to LAST_BIPRED_UPDATE frames that are not used as
references.

Change-Id: I5514d34a64dd486bbb5756c2d0612946f598a789