write dts to the timestamp part of the flv header, not pts

The Flash decoder expects the FLV timestamp to be the decoding timestamp not the
presentation timestamp. Using pts creates noticable bugs when using a
non-baseline H264 profile.

@@ -289,10 +289,10 @@ hls.FlvTag = function(type, extraData) {
     this.bytes[ 2] = (len & 0x0000FF00) >>>  8;
     this.bytes[ 3] = (len & 0x000000FF) >>>  0;
     // write the Timestamp
-    this.bytes[ 4] = (this.pts & 0x00FF0000) >>> 16;
-    this.bytes[ 5] = (this.pts & 0x0000FF00) >>>  8;
-    this.bytes[ 6] = (this.pts & 0x000000FF) >>>  0;
-    this.bytes[ 7] = (this.pts & 0xFF000000) >>> 24;
+    this.bytes[ 4] = (this.dts & 0x00FF0000) >>> 16;
+    this.bytes[ 5] = (this.dts & 0x0000FF00) >>>  8;
+    this.bytes[ 6] = (this.dts & 0x000000FF) >>>  0;
+    this.bytes[ 7] = (this.dts & 0xFF000000) >>> 24;
     // write the StreamID
     this.bytes[ 8] = 0;
     this.bytes[ 9] = 0;