▁to ▁transmit ▁the ▁P - frame ▁before ▁the ▁B - frames ▁and ▁it ▁will ▁delay ▁the ▁transmission ▁( it ▁will ▁be ▁necessary ▁to ▁keep ▁the ▁P - frame ). ▁ ▁This ▁structure ▁has ▁strong ▁points : ▁ ▁It ▁minim izes ▁the ▁problem ▁of ▁possible ▁un cover ed ▁areas . ▁ ▁P - frames ▁and ▁B - frames ▁need ▁less ▁data ▁than ▁I - frames , ▁so ▁less ▁data ▁is ▁transm itted . ▁ ▁But ▁it ▁has ▁weak ▁points : ▁ ▁It ▁increases ▁the ▁complexity ▁of ▁the ▁dec oder , ▁which ▁can ▁mean ▁more ▁memory ▁needed ▁to ▁rear range ▁the ▁frames , ▁and ▁a ▁tiny ▁bit ▁more ▁processing ▁power . ▁ ▁B - frames ▁may ▁introduce ▁dec oding ▁dependency ▁which ▁in ev it ably ▁increases ▁dec oding ▁laten cy . ▁ ▁H . 2 6 4 ▁Inter ▁frame ▁prediction ▁improvements ▁ ▁The ▁most ▁important ▁improvements ▁of ▁this ▁technique ▁in ▁regard ▁to ▁previous ▁H . 2 6 4 ▁standard ▁are : ▁More ▁flexible ▁block ▁partition ▁Resol ution ▁of ▁up ▁to ▁ ¼ ▁pixel ▁motion ▁compens ation ▁Multiple ▁references ▁En hanced ▁Direct / Sk ip ▁Mac ro block ▁ ▁More ▁flexible ▁block ▁partition ▁ ▁L umin ance ▁block ▁partition ▁of ▁ 1 6 × 1 6 ▁( MP EG - 2 ), ▁ 1 6 × 8 , ▁ 8 × 1 6 , ▁and ▁ 8 × 8 . ▁The ▁last ▁case ▁allows ▁the ▁division ▁of ▁the ▁block ▁into ▁new ▁blocks ▁of ▁ 4 × 8 , ▁ 8 × 4 , ▁or ▁ 4