let (mv0, ref0, mv1, ref1) = self.get_direct_mv(frame_refs, temporal_mv, cur_id, 0);
self.apply_to_blk4(|blk4| blk4.mv = [mv0, mv1]);
self.apply_to_blk8(|blk8| blk8.ref_idx = [ref0, ref1]);
let (mv0, ref0, mv1, ref1) = self.get_direct_mv(frame_refs, temporal_mv, cur_id, 0);
self.apply_to_blk4(|blk4| blk4.mv = [mv0, mv1]);
self.apply_to_blk8(|blk8| blk8.ref_idx = [ref0, ref1]);