Redirect connections to local server
$ sudo iptables -t nat -A OUTPUT -p tcp --dport 1935 -j REDIRECT
Start local server (port 1935 seems hardcoded)
./rtmpsrv
Remove redirect
$ sudo iptables -t nat -D OUTPUT -p tcp --dport 1935 -j REDIRECT
$ sudo iptables -t nat -A OUTPUT -p tcp --dport 1935 -j REDIRECT
./rtmpsrv
$ sudo iptables -t nat -D OUTPUT -p tcp --dport 1935 -j REDIRECT