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FEC Delay
- Controls both how much delay is introduced into the system by
FEC
, and also to an extent
how effective the recovery is (which is dependent greatly on the packet rate). The default of 100mS
should only be altered on recommendation of Comrex support.
Base FEC
- This parameter applies a constant rate of
FEC
targeting recovery of the specified expected
loss rate. It is measured in percent packet loss to be corrected. This is useful when retransmission is
not effective (e.g., high delay network) and
auto-FEC
is not working as desired. It should be used on
recommendation of Comrex support.
Retransmit
- In addition to
FEC
, LiveShot utilizes an
ARQ
style algorithm to allow retransmission of lost
packets when time permits. This mode is recommended but can be disabled here.
Stuffing
- Due to the nature of H.264 video encoding, the network stream from LiveShot is often
inherently bursty. Some networks respond poorly to bursty data. This mode allows LiveShot to include
unused “
stuffing
” data to “
even out
” the encoder output. It is recommended off unless needed.
Header Compression
- The nature of Internet packets sometimes results in IP overhead (RTP
headers and other info) actually using nearly as much bandwidth as the payload. LiveShot by default
compresses some of these headers to conserve network bandwidth. In instances where the network
rejects this, or packet inspection is required, this compression can be disabled.
Encoder Throttle
- When CrossLock is used, the system has the capability of instructing the encoder
to reduce bitrate when network conditions are challenging. This can result in reduced frame rate and/
or resolution. In instances where this can not be tolerated, the option can be disabled here. Setting
Encoder Throttle
off will usually result in a lower stability factor.
STUN Server
- This is the address of a cloud server used to establish determination of public IP
addresses and router firewall information automatically. It is important to the proper operation of
Switchboard and CrossLock. By default, the setting points to the Comrex server. The user is free to set
up their own STUN server, or to point to any alternate server here.
Always Connect
- In situations where only one pair of LiveShots exist in the fleet, there may be an
advantage to having the CrossLock layer maintained between the LiveShots regardless of whether
media connections are established. CrossLock uses very little network bandwidth, so this is sometimes
advantageous. If this is selected, you’ll see a list of available connection peers. Once it’s selected,
CrossLock will be established and maintained with that peer until power or network are removed, then
reestablished when restored.
