OPÇÃO AMF/FFmpeg: 

MaxNumRefFrames=5 HighMotionQualityBoostEnable=1 BReferenceEnable=true EnableVBAQ=false EnablePreAnalysis=true PASceneChangeDetectionEnable=false PATemporalAQMode=2 PAHighMotionQualityBoostMode=1 PAFrameSadEnable=true

Fonte: https://www.youtube.com/watch?v=mV3eHF-N8vg