refactor(nginx): streams are separated by key

nginx/nginx.conf

@@ -16,9 +16,11 @@ rtmp {
             allow play all;
 
             hls on;
-            hls_path /tmp/hls;
+            hls_nested on;
+            hls_path /stream;
+            hls_fragment_naming system;
             hls_fragment 3;
-            hls_playlist_length 60;
+            hls_playlist_length 28800;
         }
     }
 }
@@ -33,7 +35,7 @@ http {
                 application/vnd.apple.mpegurl m3u8;  # proper MIME for HLS playlists
                 video/mp2t ts;                         # MPEG-TS segment MIME
             }
-            root /tmp;
+            root /stream;
             add_header Cache-Control no-cache;         # prevent stale segments
             add_header Access-Control-Allow-Origin *;   # CORS for browser playback
         }