ruby standard configuration User Manual
Version: 6.4.0/2
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9. The Web UI
Stream Tuning Options
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Defining a Fixed Time Offset
By configuring a RAVENNA Static Stream element, it is possible to define a fixed Time Offset using the
Fixed
Jitter Reserve
field:
Logic -> RAVENNA Static Stream
Once a non-zero value is entered, a fixed Time Offset is applied (instead of automatic or manual tuning). The
value entered must include the path delay and desired minimum buffer margin as follows:
Fixed Jitter Reserve
=
Path Delay
+
minimum Buffer Margin
.
The resulting Time Offset is then calculated from the configured value and the packet size of the incoming
stream:
Time Offset
=
Samples per Frame
(packet size) +
Fixed Jitter Reserve
If you want to define a fixed playout time, you have to subtract the packet size from the fixed jitter reserve.
In the Stream Destinations List, the Path Delay is displayed as 0 (as there is no measurement) and is included
in the displayed Jitter Reserve.
Web UI (RAVENNA -> Stream Destinations List)
You can tell whether a fixed Time Offset has been defined by the configuration or Web UI by looking at the
Path Delay and Jitter Reserve fields:
·
Path Delay = 0 and Jitter Reserve > 0 indicates that the ON-AIR Designer
Fixed Jitter Reserve
field is
active (> 0).
·
Path Delay = 0 and Jitter Reserve = 0 indicates that the Web UI
Set Time Offset
button has been used
to set the offset.
If the Time Offset of a stream with a Fixed Jitter Reserve is changed via the Web UI, then it will be reset to the
configured value (instead of automatic tuning) if late packets arrive repeatedly at the receiver.
