• Optimize --vpp-kfm / --vpp-rtgmc / --vpp-degrain by adding SAD-threshold early termination for motion search.
• Optimize --vpp-kfm by removing redundant processing.
• Handle mixed RFF sources properly in --vpp-kfm.
• Fix --vpp-kfm mode=24 stall and timestamps.
• Fix chroma degrain analysis in --vpp-rtgmc. ( #786 )
• Fix high bit-depth variance calculation in --vpp-nnedi. ( #779 )