update demo conf for speex2aac and cpu_affinity

@@ -62,7 +62,7 @@ work_dir ./;
 # @reamrk do not support reload.
 # default: off
 asprocess off;
-# whether using build-in speex to aac transcoding
+# whether use build-in speex to aac transcoding
 # default: off
 speex2aac off;
 # set cpu affinity,the index of the cpu core,0,1,2,...

@@ -5,6 +5,11 @@ listen              1935;
 max_connections     1000;
 srs_log_tank        file;
 srs_log_file        ./objs/srs.log;
-speex2aac           on;
+# whether use build-in speex to aac transcoding
+# default: off
+speex2aac on;
+# set cpu affinity,the index of the cpu core,0,1,2,...
+# default -1,don't set affinity
+cpu_affinity 0;
 vhost __defaultVhost__ {
 }