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 (encoder speed)"
Profile="Profile"
Tune="Tune"
EncoderOptions="x264 Encoder Options (separated by space)"