Bitrate="Bitrate" CustomBufsize="Use Custom Buffer Size" BufferSize="Buffer Size" UseCBR="Use CBR" CRF="CRF" KeyframeIntervalSec="Keyframe Interval (seconds, 0=auto)" CPUPreset="CPU Usage Preset (higher = less CPU)" Profile="Profile" Tune="Tune" None="(None)" EncoderOptions="x264 Options (separated by space)" VFR="Variable Framerate (VFR)"