useRdInterMode property
When true, the LAST-ref per-MB mode pick replaces the four
hand-tuned *SadBias constants with (sadPerBit16 * R) >> 8
where R = mvRefModeBitCost(modeToken, mvRefProbs) (+ mvBitCost
for NEWMV). mvRefProbs is derived from the findNearMvs cnt
when predictorMotionSearch is on, else from the all-zeros default
context row. Default false keeps existing behaviour byte-identical.
Implementation
final bool useRdInterMode;