refine hls m3u8 refresh interval and buffer time

@@ -536,6 +536,9 @@
             srs_player = new SrsPlayer("player_id", srs_get_player_width(), srs_get_player_height());
             srs_player.on_player_ready = function() {
                 var buffer_time = 0.5;
+                if (url.indexOf('.m3u8') > 0) {
+                    buffer_time = 2;
+                }
 
                 if (query.buffer) {
                     for (var i = 0; i < bts.length - 1; i++) {

@@ -110,7 +110,9 @@ package
 					to = hls.duration * 1000 / hls.tsCount * m3u8_refresh_ratio;
 				}
 				setTimeout(refresh_m3u8, to);
-				log("m3u8 not changed, retry after " + to.toFixed(2) + "ms");
+				log("m3u8 not changed, retry after " + to.toFixed(2) + "ms, duration=" 
+					+ hls.duration.toFixed(2) + "s, count=" + hls.tsCount.toFixed(0) 
+					+ ", refresh-ratio=" + m3u8_refresh_ratio.toFixed(2));
 				return;
 			}
 			

@@ -31,7 +31,7 @@ package
     public class Player
     {
 		// refresh every ts_fragment_seconds*M3u8RefreshRatio
-		public static var M3u8RefreshRatio:Number = 0.5;
+		public static var M3u8RefreshRatio:Number = 0.45;
 		
 		// parse ts every this ms.
 		public static var TsParseAsyncInterval:Number = 80;