update demo.conf

@@ -170,7 +170,6 @@ vhost players {
         }
     }
 }
-
 vhost players_pub {
     hls {
         enabled         on;
@@ -190,7 +189,19 @@ vhost players_chat {
         ffmpeg          ./objs/ffmpeg/bin/ffmpeg;
         engine chat_hls {
             enabled         on;
-            vcodec          copy;
+            vfilter {
+            }
+            vcodec          libx264;
+            vbitrate        300;
+            vfps            15;
+            vwidth          768;
+            vheight         320;
+            vthreads        1;
+            vprofile        baseline;
+            vpreset         fast;
+            vparams {
+                g           30;
+            }
             acodec          libaacplus;
             abitrate        30;
             asample_rate    44100;
@@ -206,6 +217,6 @@ vhost chat_hls {
         enabled         on;
         hls_path        ./objs/nginx/html;
         hls_fragment    2;
-        hls_window      8;
+        hls_window      10;
     }
 }