tryAltrefZeroMv property

bool tryAltrefZeroMv
final

When true, every inter MB also evaluates ZEROMV against the ALTREF reconstruction. If the ALTREF-zero SAD plus altrefSadBias beats the LAST-relative best, the MB's reference is switched to ALTREF (still ZEROMV, no MV bits spent). Lets a stale ALTREF rescue MBs whose LAST/GOLDEN content has drifted.

Implementation

final bool tryAltrefZeroMv;