Hopefully at some point soon OBS will support SRT, but for now we'll need to run a separate application. Assuming that you are already using OBS for streaming to an external destination, we'll use the "recording" feature to send to Haivision's srt-live-transmit application.
There's some work required to compile srt-live-transmit, and I'll admit I haven't gotten it to work on Windows yet, but it's easy on Linux (including Windows Subsystem for Linux) and Mac.
SRT for MacGetting SRT on Mac just involves launching the "Terminal" program and running two commands:
brew update brew install srt
This will install srt-live-transmit at:
SRT for Linux or WSLIf you have Ubuntu installed under Windows 10 through Windows Subsystem for Linux, you can run the following commands in the terminal:
sudo apt update sudo apt upgrade sudo apt install tclsh pkg-config cmake libssl-dev build-essential git git clone https://github.com/Haivision/srt.git cd srt ./configure make
After the compilation process, you should have:
Sending from OBS to srt-live-transmitFrom the terminal (on Mac, Linux, or WSL), run the following command:
./srt-live-transmit udp://:1234 srt://:5678 -v
On your Mac you may first need to change to the right directory:
That command listens for a UDP stream (that we'll send from OBS) and listens for a request to unicast it as an SRT stream. The -v means verbose mode, which allows us to read what it is doing.
In OBS we need to go into Settings, click on Output, switch the Output Mode to Advanced and click on the Recording tab. Switch the Type to Custom Output (FFmpeg) and the FFmepeg Output Type to Output to URL.
The File path or URL should be set to udp://127.0.0.1:1234?pkt_size=1316 (127.0.0.1 means sending to the same computer that OBS is running on) and the Container Format should be changed to mpegts. I haven't done any testing, but I'm assuming that decreasing the Keyframe interval should decrease latency, and decreasing the Audio Bitrate is probably fine to decrease bandwidth usage.
Click OK, then the Start Recording button. Have a look at the terminal window where srt-live-transmit is running. You should see information about the stream.
Add the SRT source to BrightSign or play it as a network source in VLC (if your sending computer is at 10.0.0.200 then srt://10.0.0.200:5678). You should see your stream that is being transmitted from OBS and relayed by srt-live-transmit.
Hopefully this works for you, feel free to comment if you encounter issues.