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BRIDGE LIVE Video I/O and Streaming Appliance v1.12 77 www.aja.com
Type
• RTP/UDP
• UDP
• SRT
SRT Protocol for Reliable Data Transmission
BRIDGE LIVE supports data transmission using SRT (Secure Reliable Transport)
protocol. SRT is a video transport protocol that is intended to be used over
unreliable networks such as public Internet. It adjusts the packet loss, jitter and
fluctuating bandwidth in order to maintain the high quality of the transported
video stream. It has end-to-end security mechanisms to protect the transmitted
data, and it is easy to configure to work with network firewalls. If you wish to learn
more about the protocol, please visit the official SRT Alliance website:
BRIDGE LIVE supports 2 SRT modes of operation – Listener, and Caller. In other
words, this is simply the client–server model. The Listener unit is configured to
connect to its own local IP address that will be receiving data from the (external)
Caller unit. Therefore, the Caller machine is configured with the IP address of an
external (to it) unit where the data will be listened to.
NOTE: SRT is a connection-oriented communication and therefore cannot use multicast
IP delivery.
Configuring Output Side of SRT Transmission
When creating the pipeline’s output side, you can choose to send the traffic via
SRT in order to make the connection more reliable and prevent image loss during
transmission. In the Output stream sink section, you can select Type – SRT which
will add the SRT configuration options. See
. Similarly, as for Input
configuration, you can choose between 2 modes – Caller, and Listener.
Figure 123. Configuring SRT Output
SRT Mode
• Listener – IP:port of the local machine where an external Caller unit will
request a connection
• Caller – IP:port of the remote machine where the external unit is waiting to
receive data
SRT Overhead
In addition, you should define the SRT overhead parameter – a percentage
amount over Total Bit Rate that can be surpassed in order to achieve the lost
data recovery. As a result, the maximum used connection bit rate is equal to the
configured Total Bit Rate + SRT overhead. In general, this is the upper limit and
the connection does not require it for normal operation.