Title: Stream live video using nginx

	Title: Stream live video using nginx
	Author: Solène
	Date: 26 August 2019
	Tags: openbsd gaming nginx
	Description:

	This blog post is about a nginx rtmp module for turning your nginx
	server into a video streaming server.

	The official website of the project is located on github at:
	https://github.com/arut/nginx-rtmp-module/

	I use it to stream video from my computer to my nginx server, then
	viewers can use `mpv rtmp://perso.pw/gaming` in order to view the
	video stream. But the nginx server will also relay to twitch for
	more scalability (and some people prefer viewing there for some
	reasons).

	The module will already be installed with nginx package since OpenBSD
	6.6 (not already out at this time).

	There is no package for install the rtmp module before 6.6.
	On others operating systems, check for something like "nginx-rtmp" or
	"rtmp" in an nginx context.

	Install nginx on OpenBSD:

	pkg_add nginx

	Then, add the following to the file /etc/nginx/nginx.conf

	load_module modules/ngx_rtmp_module.so;
	rtmp {
	server {
	listen 1935;
	buflen 10s;

	live on;
	allow publish 176.32.212.34;
	allow publish 175.3.194.6;
	deny publish all;
	allow play all;

	record_path /htdocs/videos/;
	record_suffix %d-%b-%y_%Hh%M.flv;

	}
	}

	The previous configuration sample is a simple example allowing
	172.32.212.34 and 175.3.194.6 to stream through nginx, and that will
	record the videos under /htdocs/videos/ (nginx is chrooted in
	/var/www).

	You can add the following line in the "application" block to relay the
	stream to your Twitch broadcasting server, using your API key.

	push rtmp://live-ams.twitch.tv/app/YOUR_API_KEY;

	I made a simple scripts generating thumbnails of the videos and
	generating a html index file.

	Every 10 minutes, a cron check if files have to be generated,
	make thumbnails for videos (tries at 05:30 of the video and then
	00:03 if it doesn't work, to handle very small videos) and then
	create the html.

	The script checking for new stuff and starting html generation:

	#!/bin/sh


	do
	echo $file
	PIC=$(echo $file \| sed 's/flv$/jpg/')
	if [ ! -f "$PIC" ]
	then
	ffmpeg -ss 00:05:30 -i "$file" -vframes 1 -q:v 2
	"$PIC"
	if [ ! -f "$PIC" ]
	then
	ffmpeg -ss 00:00:03 -i "$file" -vframes 1
	-q:v 2 "$PIC"
	if [ ! -f "$PIC" ]
	then
	echo "problem with $file" \| mail
	[email protected]
	fi
	fi
	fi
	done
	cd ~/dev/videos/ && sh html.sh

	This one makes the html:

	#!/bin/sh


	COUNT=0

	<html>
	<body>
	<h1>Replays</h1>
	<table>
	EOF

	do
	if [ $COUNT -eq 0 ]
	then
	echo "<tr>" >> index.html
	INROW=1
	fi
	COUNT=$(( COUNT + 1 ))
	SIZE=$(ls -lh $file \| awk '{ print $5 }')
	PIC=$(echo $file \| sed 's/flv$/jpg/')

	echo "<td><a href=\"$file\"><img src=\"$PIC\" width=320
	height=240 /><br />$file ($SIZE)</a></td>" >> index.html
	if [ $COUNT -eq $PER_ROW ]
	then
	echo "</tr>" >> index.html
	COUNT=0
	INROW=0
	fi
	done

	then
	echo "</tr>" >> index.html
	fi

	</table>
	</body>
	</html>
	EOF