Nginx-Rtmp not able to set latency - nginx

Question

I'm using nginx-rtmp module to capture RTMP streams from my cameras and transmit them to further systems.
Generally my setup is working fine and generating .m3u8 files properly. For example:
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:23
#EXT-X-TARGETDURATION:50
#EXT-X-DISCONTINUITY
#EXTINF:49.957,
verification-23.ts
But the fragments that are generated are always 50s as you can see on the above example.
This is causing more than 50s delay in playback that I would like to avoid.
I tried to decrease Nginx parameters to, for example 3s for fragment and 15s for playlist:
hls_fragment 3s;
hls_playlist_length 15s;
but it didn't work. .m3u8 files were still generated with #EXTINF:49.957.
Is it possible to decrease the delay with Nginx configuration? Or it might be some kind of additional configuration on the cameras?
My current nginx.conf file:
user www-data;
worker_processes auto;
pid /run/nginx.pid;
events {
worker_connections 768;
}
rtmp {
server {
listen 1935;
chunk_size 2000;
application live {
live on;
hls on;
hls_path /tmp/hls;
hls_fragment 50s;
hls_playlist_length 60s;
deny play all;
}
}
}
http {
sendfile off;
tcp_nopush on;
directio 512;
default_type application/octet-stream;
server {
server_name stream.mydomain.pl;
location / {
# Disable cache
add_header 'Cache-Control' 'no-cache';
# CORS setup
add_header 'Access-Control-Allow-Origin' '*' always;
add_header 'Access-Control-Expose-Headers' 'Content-Length';
# allow CORS preflight requests
if ($request_method = 'OPTIONS') {
add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Max-Age' 1728000;
add_header 'Content-Type' 'text/plain charset=UTF-8';
add_header 'Content-Length' 0;
return 204;
}
types {
application/dash+xml mpd;
application/vnd.apple.mpegurl m3u8;
video/mp2t ts;
}
root /tmp;
}
# Certbot configuration
# ...
}