SRT contribution and delivery

Outcome

An SRT signal will connect to a Flow Manager input and route to one or more outputs with the required latency, bandwidth, encryption, and Stream ID settings.

Signal Flow

flowchart LR
    accTitle: SRT contribution and delivery signal flow
    accDescr: A contribution encoder sends SRT to a flow engine. The engine sends SRT to a remote destination and WHEP to browser monitoring.

    encoder["Contribution encoder"] -->|SRT| engine["Flow engine"]
    engine -->|SRT| destination["Remote destination"]
    engine -->|WHEP| monitoring["Browser monitoring"]

Before You Begin

• Decide which endpoint will be the caller and which will be the listener for each connection.
• Confirm the listener is reachable on the selected port.
• Agree on latency, maximum bandwidth, passphrase, key length, and Stream ID where used.
• Confirm the flow engine reports ready.

Choose Caller and Listener

Use Caller on the endpoint that initiates the connection to a known remote host. Use Listener on the endpoint that waits for the remote caller. Studio fixes a listener’s host to 0.0.0.0.

A caller still needs a reachable listener. Confirm routing, firewall, cloud security-group, and address translation behavior before the show.

Steps

1. Create a flow on the intended engine.
2. Add an SRT input.
3. Set caller or listener mode, port, latency, and maximum bandwidth.
4. If encryption is required, enter the same passphrase and key length used by the other endpoint.
5. Enter the expected Stream ID if the receiving service uses one for routing.
6. Add and configure the required output. It can use a different SRT caller/listener relationship from the input.
7. Select Copy URL where a generated address is useful for the other system.
8. Start the input, output, and flow.

Verify

1. Confirm the input and output report an active state.
2. Check available uptime and bitrate statistics.
3. Confirm stable picture and audio at the destination.
4. Test the path long enough to expose likely network variation.
5. Perform a controlled reconnect before show day.

Shutdown Checklist

• Confirm the destination has finished recording or delivery.
• Stop the SRT output and input.
• Stop the flow.
• Stop unused billable machines and verify their state.

Troubleshooting

If the connection does not establish, compare caller/listener mode, host, port, encryption, and Stream ID on both ends before increasing latency. See An SRT connection won’t establish. For connection-mode, latency, and maximum-bandwidth guidance, see SRT settings.