NCast PR720 - Manual (Page 41)

NCast Presentation Recorder Reference Manual
4. The Channel Table
4.1. C
HANNEL
S
ETTINGS
A channel is a collection of parameter settings that defines the operating characteristics for a streaming,
webcast or collaborative session. Just as Channel 2 on your TV defines the video carrier to be “55.25 MHz.”,
Channel 2 on a Presentation Recorder might define the graphics multicast address to be “239.192.0.1”.
There are many parameters associated with a channel, items like the video and audio multicast or unicast
addresses, port numbers, MTU’s, codecs, bit rates, layouts, overlays and modes of operation. Think of a
channel as a type of “preset” for all of those parameters. There are 100 channels allowed, so 100 different
presets are available for definition.
Once the channel settings have been established, typically by the administrator of the Presentation
Recorder, or maybe the IT or Network department within an organization, they will not be changed by
ordinary users of the Presentation Recorder. The user is instructed to “Use Channel 2” and no further
detailed instructions are required.
When a Channel is started the Presentation Recorder begins its broadcast or recording Session. All of the
many Channel parameters are transferred to the working Session parameters and the encoding and layout
parameters defined by the Channel become the current encoding mode and layout of the Presentation
Recorder. Any changes or updates to the Channel Table have no effect on the Session until the next Session
start.
Session parameters which may be changed or updated appear on the Sources page and on the Custom
page. Windows and Overlays may be altered during a Session, but the initial Frame size and aspect ratio
may not change. The Frame size MUST remain fixed during a Session.
4.1.1. Channel Initiation
At the left edge of each channel listed is an activation button. Pressing this button activates all the
parameters for the Channel and a new Session based on these settings is started.
4.1.2. Channel Modification
NCast Corporation Revision 1.1
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