成员的完整列表，这些成员属于 NERtcVideoEncodeConfiguration,包括所有继承而来的类成员

	bitrate	NERtcBaseVideoEncodeConfiguration
	cropMode	NERtcVideoEncodeConfiguration
	degradationPreference	NERtcVideoEncodeConfiguration
	frameRate	NERtcBaseVideoEncodeConfiguration
	height	NERtcVideoEncodeConfiguration
	maxProfile	NERtcBaseVideoEncodeConfiguration
	minBitrate	NERtcBaseVideoEncodeConfiguration
	minFrameRate	NERtcBaseVideoEncodeConfiguration
	mirrorMode	NERtcVideoEncodeConfiguration
	orientationMode	NERtcVideoEncodeConfiguration
	width	NERtcVideoEncodeConfiguration