Product guide

SRT Redundancy Proxy

Forward one SRT input to two destinations with the free edition or run multiple relay instances with MULTI.

Updated 2026-07-23 UTC

Editions

Compare editions

Paid editions include all features of the Free edition, plus the capabilities listed below.

Function	SRT Redundancy Proxy	SRT Redundancy Proxy MULTI
One SRT Listener input per relay instance	○	○
Up to two SRT Caller outputs per relay instance	○	○
Independent output enable controls	○	○
Automatic startup with saved settings	○	○
Live connection and forwarding statistics	○	○
Local application logs	○	○
Multiple independent relay instances	×	○

○ Included · × Not included

Current version: Version not verified for either edition.

Overview

Use this guide to relay one SRT input to as many as two destinations while viewing the forwarding state. The free edition runs one relay instance. The paid MULTI edition runs multiple independent relay instances.

Key features

Receive one SRT stream on a configurable listener port.
Forward the input to two independently enabled SRT destinations.
Start automatically with saved settings when required.
Display input and output connection state, bitrate, RTT, packet and byte counts, drops, and errors.
Open the local application log folder for troubleshooting.
Run one free-edition instance as ID=1.

Installation

Install the application from the Microsoft Store link below.
Document the input mode and port and the settings for both destinations.
Confirm that every required UDP path is allowed by the applicable firewalls.

Basic configuration

Configure and start the input side first.
Configure each Caller output with its receiver address and port.
Leave an unused output disabled instead of entering an unverified destination.
Check the displayed state for the input and each enabled output.

Settings

Setting	Purpose	Available values
Input port	Set the listener port for the incoming SRT stream.	1–65535
Output 1 address	Set the first SRT receiver address.	Host or IP address
Output 1 port	Set the first SRT receiver port.	1–65535
Output 1	Enable or disable forwarding to the first destination.	On or Off
Output 2 address	Set the second SRT receiver address.	Host or IP address
Output 2 port	Set the second SRT receiver port.	1–65535; leave blank to use one output only
Output 2	Enable or disable forwarding to the second destination.	On or Off

Main operations

Verify that input packets are arriving before troubleshooting an output. Test destinations one at a time, then confirm both together.

Local test

Start one or two listeners:

ffplay "srt://0.0.0.0:9100?mode=listener"
ffplay "srt://0.0.0.0:9200?mode=listener"

With the proxy listening on port 9000, send an MPEG-TS stream to its input:

ffmpeg -re -i input.ts -c copy -f mpegts "srt://127.0.0.1:9000?mode=caller"

The default local destinations are 127.0.0.1:9100 and 127.0.0.1:9200.

MULTI workflow

Create the required relay instances.
Give every listener on the same network interface a unique input port.
Configure each input and its associated outputs independently.
Start and verify one relay path before enabling the next.
Maintain a written mapping between each instance, source, and destinations.
Confirm aggregate network and system capacity as instances are added.

Network roles

Input: SRT Listener
Output 1 and Output 2: SRT Caller
Processing: payload relay without video or audio transcoding

System requirements

Windows 10 or Windows 11
SRT-compatible sender and receiver applications
Network access between the sender, proxy, and receivers

Checks before use

A second output provides another destination; it does not repair a failed source or shared network path.
Confirm the capacity of the outgoing network for both copies.
Configure receiver addresses, UDP ports, firewall rules, and stream handling for every path.
In MULTI, check for listener-port conflicts before troubleshooting stream content.
Do not expose listening ports directly to untrusted networks.

Troubleshooting

Use the status display to identify whether the input or one output is affected. See the relay FAQ.