VBrick Systems VB6000, VB4000, VB5000 manual Configuration Encoder Audio

Picture Center	Sets the quality difference between the center of the image and the
Quality Difference	edges. By reducing quality on the edges the encoder may be able to
	improve the quality of the center of the image at a given bit rate.
Buffer Size	Sets the rate control buffer depth in milliseconds. Larger buffer sizes
	may improve video quality and make the encoder's rate control more
	consistent. This value is also used as the .wmv pre-roll for the stream
	header so the player generally buffers at least this amount of data and
	as a result larger buffer size values will increase end-to-end latency.
Video Rate2	Use to configure multiple bit rates. Check Enabled to display the
	configuration settings for Video Rate2. Once enabled, VideoRate2 and
	VideoRate3 are available for selection on the Multicast, Server, and
	Archiver pages. If selected on those pages, an error will display if you
	attempt to disable them on this page. Video Rates1, 2, and 3 must have
	different Target Bit Rates.
Video Rate3	Use to configure multiple bit rates. Check Enabled to display the
	configuration settings for Video Rate3. Video Rates1, 2, and 3 must
	have different Target Bit Rates.

Configuration: Encoder > Audio

If configuring audio for multiple bit rate, you can specify separate encoder settings for up to three audio encoders. When Audio Rate2 or 3 is enabled, the Sample Frequency must be

44.1KHz and only bit rates compatible with 44.1 KHz can be selected. As with video, any change in the settings for any of the audio encoders will cause a brief interruption of video and audio for all three encoders. All streams being sent from the unit (including multicast and push) are interrupted. Any active HTTP or RSTP clients will be dropped and any archive file in progress will be closed.

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