Cobalt Co9992-4ENC-4K-HEVC Software-Defined Broadcast Encoder - Manual (Page 78)

78
of access units dropped for the current connection. This count resets when a new
connection is established.
Encoder Statistics Status Tab – RIST Statistics
If the encoder channel is in RIST mode, the following additional statistics are displayed:

Output Rate: this field contains the measured total IP output payload bit rate, in bits/sec.
It can be lower than the transport rate, if NULL packets are removed from the stream, or
higher, if multiple destinations are enabled.

Bitmask Requests: this field contains the number of bitmask retransmission requests
received by the encoder.

Range Requests: this field contains the number of range retransmission requests
received by the encoder.

Retransmitted Packets: this field contains the number of packets that have been
retransmitted. It is possible that this number is higher than the number of retransmission
requests because one request can ask for up to 17 packets.

Packets Not Found: this field contains the number of packets whose retransmission has
been requested, but are no longer in the encoder buffer. If this number grows, increase
the NACK Window in the Output Tab–RIST configuration section.

Invalid NACK Requests: this field contains the number of NACK requests deemed
invalid or malformed. If this number is non-zero, please contact the receiver vendor.

Requested Stream Not Found: each of the encoder output streams has its individual
SSRC identifier. A non-zero count here indicates that the encoder received a request for
an SSRC it does not have. The possible causes for this are:
o The encoder has been rebooted, and received a request matching an old SSRC.
o A network routing or forwarding problem caused the encoder to receive a request
that was intended for a different encoder.

Dropped Retransmissions: this field contains the number of packet retransmissions that
were dropped due to the retransmission rate limit configured in the Output Tab–RIST
section.