VTH264EncHW="Apple VT H264 Hardware Encoder"
VTH264EncSW="Apple VT H264 Software Encoder"
VTEncoder="VideoToolbox Encoder"
Bitrate="Bitrate"
UseMaxBitrate="Limit bitrate"
MaxBitrate="Maximum bitrate"
MaxBitrateWindow="Maximum bitrate window (seconds)"
KeyframeIntervalSec="Keyframe Interval (seconds, 0=auto)"
Profile="Profile"
None="(None)"
DefaultEncoder="(Default Encoder)"
UseBFrames="Use B-Frames"

