nginx.conf

worker_processes 1;
daemon off;

events {
       worker_connections 1024;
}

http {
     server {
     	    listen 8080;
            server_name localhost;
            set $hls_path /mnt/chunks/;

            types {
                application/vnd.apple.mpegurl m3u8;
                video/mp2t ts;
            }

            location ~ -audio\.m3u8$ {
                default_type application/vnd.apple.mpegurl;
                content_by_lua '
                    local base_m3u8_url = ngx.var.uri:gsub("-audio.m3u8", ".m3u8")
                    local res = ngx.location.capture(base_m3u8_url)
                    if res.status == 200 then
                        local new_body = res.body:gsub("\.ts", ".aac")
                        ngx.print(new_body)
                    else
                        ngx.exit(res.status)
                    end
                ';
             }

            location ~ /master-playlist.m3u8$ {
                rewrite (.*)master-playlist.m3u8$ $1playlist.m3u8 break;
                content_by_lua '
                    local res = ngx.location.capture(ngx.var.uri);
                    if res.status == 200 then
                        local first_playlist = res.body:match("[^\\n]*m3u8")
                        local audio_playlist = first_playlist:gsub("\.m3u8", "-audio.m3u8")
                        local ext_inf = "#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=64000\\n"
                        ngx.print(res.body)
                        ngx.print(ext_inf)
                        ngx.print(audio_playlist)
                        ngx.print("\\n")
                    else
                        ngx.exit(res.status)
                    end
                ';
            }

            location ~ (\.aac)$ {
                ngx_hls_audio_track;
                ngx_hls_audio_track_rootpath $hls_path;
                expires 10m;
            }

            location ~ \.(ts) {
                root $hls_path;
            }

            location ~ \.(m3u8) {
                root $hls_path;
            }
     }
}