VBrick Systems VB6000, VB4000 manual MBR Groups, Shared Audio Settings, Independent Audio Settings

Introduction

Table 6. Audio Rate Settings

Shared Audio Settings		Independent Audio Settings
•	Audio Input Level	•	L+R Bit Rate
•	Audio Gain	•	Audio Channels
•	Sample Frequency

MBR Groups

VBrick's implementation of multiple bit rate supports the concept of groups. Groups are used in a unicast environment where the VBrick WM appliance is being used as a server. The appliance provides the option of serving one, two, or three groups of streams. A group is one set of parameters for video, audio, and script data (script data includes Closed Caption and/or Meta Data). One group must always be enabled; the other groups are optional and are enabled only when you want to serve multiple bit rates. For example, you can create three separate groups with different combinations of audio, video, and closed caption settings. The primary (or default) group is always available. The following screenshot shows how you can enable and configure different audio and video settings for MBR Group2.

Figure 4. Configuring MBR Groups

When serving multiple bit rate streams, it is the player that determines which group to request and play based on the bandwidth available or on the measured network performance between the player and the appliance. In this case, the appliance sends a stream to the player containing only the requested group. When using groups, you can also use a special URL in the player or server to request a specific group from a WM appliance that is configured with multiple bit rates. For example,

TTo instruct the appliance to make available and send only MBR Group2 use this URL:

http://172.22.113.9/vbrickvideo1/Group2

VBrick WM Appliance Admin Guide 11