How to: stream with ffmpeg and nginx rtmp, Ubuntu - nginx

Question

nginx installed with https://nginx.org/en/linux_packages.html in Ubuntu 18.04
sudo apt -y install curl gnupg2 ca-certificates lsb-release ;
echo "deb http://nginx.org/packages/ubuntu `lsb_release -cs` nginx" | sudo tee /etc/apt/sources.list.d/nginx.list ;
curl -fsSL https://nginx.org/keys/nginx_signing.key | sudo apt-key add - ;
sudo apt update ;
sudo apt install nginx ;
nginx up and running
$ ps -aux | grep nginx
root 5602 0.0 0.0 33348 880 ? Ss 17:03 0:00 nginx: master process nginx
nginx 5603 0.0 0.0 33744 2748 ? S 17:03 0:00 nginx: worker process
with /etc/nginx/nginx.conf
rtmp {
server {
listen 1935;
chunk_size 4096;
application live {
live on;
record off;
allow publish 127.0.0.1;
deny publish all;
}
}
}
ffmpeg -f lavfi -i testsrc -t 30 -pix_fmt yuv420p -f flv rtmp://localhost/live/test yields
ffmpeg version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libavresample 3. 7. 0 / 3. 7. 0
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
Input #0, lavfi, from 'testsrc':
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 320x240 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
[tcp # 0x5611668b8c00] Connection to tcp://localhost:1935 failed: Connection refused
[rtmp # 0x5611668b8520] Cannot open connection tcp://localhost:1935
rtmp://localhost/live: Connection refused
Clue:
Nothing seems to be listening on port 1935. netstat -tap | grep 1935 yields nothing
Clue2:
Albeit ps shows app as running, systemctl status nginx.service shows app status down
● nginx.service - nginx - high performance web server
Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Thu 2020-12-03 19:37:17 CET; 7min ago
Docs: http://nginx.org/en/docs/
Process: 5709 ExecStart=/usr/sbin/nginx -c /etc/nginx/nginx.conf (code=exited, status=1/FAILURE)
Things checked given other stackoverflow questions:
trying to connect to rtmp://localhost/live/test and in nginx.conf the application is correctly named live
nginx.conf correctly placed at /etc/nginx/, no other nginx.conf files exist, and nginx -s reload called to make sure it is loaded
no localhost instances in the conf file, all renamed to 127.0.0.1

Answer 1

Install nginx that supports rtmp sudo apt install nginx-core nginx-common libnginx-mod-rtmp
and not sudo apt install nginx
and then run nginx with
sudo systemctl restart nginx