Fix everything.

system/services/server/webserver/nginx/rtmp/default.nix

@@ -0,0 +1,32 @@
+{ config, lib, pkgs, ... }:
+{
+  options.services.nginx.rtmp.enable = lib.mkEnableOption "Enable an RTMP server using Nginx";
+
+  config = lib.mkIf config.services.nginx.rtmp.enable {
+    services.nginx = {
+      package = (pkgs.nginx.override {
+        modules = with pkgs.nginxModules; [ rtmp ];
+      });
+      appendConfig = ''
+        rtmp {
+          server {
+            listen 1935;
+            chunk_size 4096;
+            allow publish all;
+            application stream {
+              record off;
+              live on;
+              allow play all;
+              hls on;
+              hls_path /var/www/landing-page/streams/hls/;
+              hls_fragment_naming system;
+              hls_fragment 3;
+              hls_playlist_length 40;
+            }
+          }
+        }
+      '';
+    };
+    systemd.services.nginx.serviceConfig.ReadWritePaths = [ "/var/www/landing-page/streams/hls/" ];
+  };
+}