Cobalt Co9992-4ENC-4K-HEVC Software-Defined Broadcast Encoder - Manual (Page 89)

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127.255.255.255). The 9992-ENC will also accept the broadcast IP address of
255.255.255.255, and will transmit the packets as Ethernet broadcasts. Use of
broadcasts, however, is strongly discouraged.

Stream Name: All 9992-ENC input and output ports can be assigned a user-defined
name. This name is used to identify the stream later when making connections. Use any
descriptive name suitable for your application, or accept the default.

RTP: If this box is checked, the device will include RTP (Real Time Protocol) headers in
the output flow. If it is not checked, the transport stream will be sent over UDP/IP
without any additional headers. Note that RTP requires the use of even UDP port
numbers; when this box is checked, the user interface will enforce this restriction. The
device will not generate RTCP packets.

SMPTE 2022 FEC: The device supports SMPTE 2022 FEC in one stream per Ethernet
interface. If no streams are currently configured for SMPTE 2022 FEC, this box will be
displayed. If it is not displayed, then another stream is already using the feature. Check
this box to enable transmission of SMPTE 2022 FEC packets for this stream. Note that
SMPTE 2022 requires the use of RTP; checking this box will cause the RTP box to be
checked as well.

NULL Padding: This setting controls whether or not NULL packets are transmitted,
making the stream completely CBR. IP networks are inherently VBR, and do not require
NULL packets (which carry no information). However, the decoders may need them.
The following is a good set of rules for deciding whether or not to send NULL packets:
o If all your decoders are consumer IP set-top boxes or PCs running software
decoders, NULL packets can be disabled.
o If your decoders include professional IRDs, NULL packets must be enabled. The
great majority of professional IRDs will not work without them.
o If you are generating an MPTS (routing both encoders to the stream), enable
NULL packets. An MPTS without NULL packets is technically illegal as per
ISO/IEC 13818-1, but some systems support it.
o If you are not sure about what kind of decoder will be receiving the stream, enable
NULL packets.
This control offers the following options:
o Disabled: NULL packets are disabled and will not be transmitted. This will
cause the stream to be somewhat VBR, even if the encoder is set to CBR mode.
o Enabled – Automatic Rate: This setting enables NULL packets, but the bit rate
is automatically set by the 9992-ENC to the minimum suitable value. This is the
recommended setting. If you later reconfigure an encoder connected to this
stream, the rate will be automatically adjusted.
o Enabled – Manual Rate : This setting allows you to specify the overall stream bit
rate. If you specify the bit rate, it must be high enough to support the connected
encoders (i.e., it must be at least equal to the sum of the connected encoders’
Transport Rate , found in each encoder Status tab). Specifying a rate that is not
high enough will cause the IP Output to drop packets. Note that if this option is
selected, the IP Output will be transmitting continuously at the selected bit rate,
regardless of connections or the state of the encoders. If there is no connection to
the IP Output, it will transmit only NULL packets; if there are connections and
the encoders are stopped, it will transmit NULL packets plus (P)SI tables.