NERtcVideoSubStreamEncodeConfiguration 成员列表

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

	bitrate	NERtcBaseVideoEncodeConfiguration
	contentPrefer	NERtcVideoSubStreamEncodeConfiguration
	degradationPreference	NERtcVideoSubStreamEncodeConfiguration
	frameRate	NERtcBaseVideoEncodeConfiguration
	maxProfile	NERtcBaseVideoEncodeConfiguration
	minBitrate	NERtcBaseVideoEncodeConfiguration
	minFrameRate	NERtcBaseVideoEncodeConfiguration