8069f31076
107de19698 changes the encoder alt-ref selection behavior. Assuming min_gf_interval = max_gf_interval = 4, the frame order would be frm_1 arf_1 frm_2 frm_3 frm_4 frm_5 arf_2 before 107de19698; frm_1 arf_1 frm_2 frm_3 frm_4 arf_2 frm_5 after 107de19698. This patch reverts such alt-ref placement change. Change-Id: I93a4a65036575151286f004d455d4fcea88a1550