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transport rates are achievable; in particular, the encoder may not be able to achieve very
low transport rates if the audio bit rates are high. In these cases, the actual transport rate
output by the encoder will be higher than the configured value. The actual transport rate
is displayed in the Encoder Statistics Tab, after the Apply button has been pressed. At
that point, the actual encoder video bit rate can be found in the Encoder Statistics Tab,
under the Basic bottom tab.
• Peak Video Bit Rate, Average Video Bit Rate: These two fields are shown only if the
encoder is set to VBR mode, and determine the desired average and acceptable peak bit
rates for the video elementary stream. The peak video bit rate must be between 1.5 and 2
times the average bit rate; the user interface will enforce these limits automatically (i.e., it
will update either the average or peak to be consistent with the value being entered). For
both of these parameters, the resolution is 1000 bits/sec.
Basic Tab – Audio Configuration
• Audio Source: This parameter selects the audio source. The options are Analog Audio,
directing the encoder will to use the analog right/left audio channels connected to the
selected rear I/O panel, and SDI Embedded Audio, directing the encoder to extract
embedded audio from the SDI input. If the video Input Source (see Basic Tab – Video
Configuration) is set to Composite, this parameter is grayed out and forced to Analog
Audio. It will be selectable only if the video input source is one of the SDI variations.
When SDI Embedded Audio is selected, additional configuration options become
available, as shown below.
• Group, Channels: SDI embedded audio is typically divided into four groups (denoted by
Group 1 to Group 4); each group has four mono channels (2 stereo pairs), denoted by
Channels 1-2 and 3-4. These controls allow the selection of the desired group and
channel pair. In the large majority of the cases, the first stereo pair is in Group 1,
Channels 1-2, the second stereo pair is in Group 1, Channels 3-4, and so on. The Group
selection has one additional choice, labeled Custom DID. This allows the encoder to use
a non-standard embedded audio DID (this quite uncommon). If Custom DID is selected,
a new configuration option becomes available, where the DID can be entered:
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9223-OM (V2.5.0)
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