/VPS-stream-relay-server

VPS Stream relay server SRT/SRTLA

VPS-stream-relay-server

VPS Stream relay server SRT/SRTLA

About

Collection of notes to build a cheap ARM vps on AWS or similar as a SRT/SRTLA -> RTMP/HLS relay including FFMPEG disconnect protection.

Can be run on low and cheapest VPS on a site near your location and do audio gain adjustment or even re-encode if you upgrade to a more powerful server for HEVC.

Not step-by-step, but adapted notes that will save you time and get you mostly there.

Uses systemd combined with script-timeout to handle reset and auto-end stream. Default 3 sec SRT buffer, stream will end after 30 sec with no input. 5 second restart delay for processes

Suggested AWS:

For remux/H264: t4g.nano
If you wish to re-encode on server and use HEVC with Twitch:
For 1080@30 hevc: t4g.2xlarge 
For 1440@30 hevc: c6g.4xlarge

Requirements

sudo apt-get install srt-tools ffmpeg
  • Add to these files to /home/ubuntu or adjust script for your own location

Relay.sh

#!/bin/bash
srt-live-transmit "srt://:8989?passphrase=privatepassword&transtype=live&latency=2000&fc=102400&rcvbuf=48234496" "udp://:9191" -tm:1 -t:30

srt.sh

Example with direct feed to Twitch

  • Configure srt.sh with your streaming key
#!/bin/bash
ffmpeg -hide_banner -i "udp://:3001?timeout=30000000&fifo_size=1000000" -c copy "volume=16dB" -f flv "rtmp://TWITCH_with_/KEY"

Make excecutable

sudo chmod u+x srt.sh
sudo chmod u+x relay.sh
  • Add the following files to /etc/systemd/system/

srt.service

relay.service

relay.service

[Unit]
Description=srt

[Service]
ExecStart=/home/ubuntu/srt.sh
Restart=always
RestartSec=5

[Install]
WantedBy=multi-user.target

srt.service

[Unit]
Description=srt

[Service]
ExecStart=/home/ubuntu/srt.sh
Restart=always
RestartSec=5

[Install]
WantedBy=multi-user.target

Start the automated process

sudo systemctr start relay
sudo systemctr enable relay
sudo systemctr enable srt
sudo systemctr start srt

srtla.sh

If you want to add SRTLA, add another script that pipes srtla into your modified relay script with something like:

#!/bin/bash
/home/ubuntu/srtla/srtla_rec 6666 127.0.0.1 7777

Modify relay.sh to accept connect with patched SRT to convert to SRT.

/home/ubuntu/srt/srt-live-transmit -st:yes "srt://127.0.0.1:7777?mode=listener&lossmaxttl=40&latency=2000" "udp://:9191" -tm:1 -t:30

Build Instructions for patched SRT required for SRTLA

Fork of the patched belabox srt + buildfix from tt2468

sudo apt-get update
sudo apt-get upgrade
sudo apt-get install tclsh pkg-config cmake libssl-dev build-essential
git clone https://github.com/thetobby/srt.git
cd srt
./configure
make -j12

status.sh

If you want to monitor the status of your server live in SSH. Needs modification, but inspiration.

#!/bin/bash
#sudo journalctl --rotate
#sudo journalctl --vacuum-time=3600s
for (( ; ; ))
do
clear

disk_use=`df -P | grep /dev | grep -v -E '(tmp|boot)' | awk '{print $5}' | cut -f 1 -d "%"`
echo "Disk usage : $disk_use %"


E=`systemctl is-active relay`
echo "Relay: $E"
journalctl -e -u relay  | tail -n 4 | cut -c 44-
echo ""
H=`systemctl is-active srt`
echo "FFmpeg: $H"
journalctl -e -u srt | tail -n 6 | cut -c 44-

sleep 3
done