diff --git a/README.md b/README.md
index c7022e0d7..68690bd5e 100755
--- a/README.md
+++ b/README.md
@@ -276,6 +276,7 @@ usr sys idl wai hiq siq| read  writ| recv  send|  in   out | int   csw
 * nginx v1.5.0: 139524 lines <br/>
 
 ### History
+* v0.9, 2013-12-25, fix the bitrate bug(in Bps), use enhanced microphone.
 * v0.9, 2013-12-22, demo video meeting or chat(srs+cherrypy+jquery+bootstrap).
 * v0.9, 2013-12-22, merge from wenjie, support banwidth test.
 * v0.9, 2013-12-22, merge from wenjie: support set chunk size at vhost level
diff --git a/trunk/research/players/index.html b/trunk/research/players/index.html
index cbffc8852..f017d418a 100755
--- a/trunk/research/players/index.html
+++ b/trunk/research/players/index.html
@@ -8,6 +8,7 @@
     <script type="text/javascript" src="js/bootstrap.min.js"></script>
     <script type="text/javascript" src="js/swfobject.js"></script>
     <script type="text/javascript" src="js/srs.js"></script>
+    <script type="text/javascript" src="js/srs.log.js"></script>
     <style>
         body{
             padding-top: 55px;
diff --git a/trunk/research/players/js/srs.js b/trunk/research/players/js/srs.js
index b5f105f32..0a9a28d47 100755
--- a/trunk/research/players/js/srs.js
+++ b/trunk/research/players/js/srs.js
@@ -52,31 +52,6 @@ function update_nav() {
     $("#nav_vlc").attr("href", "vlc.html" + window.location.search);
 }
 
-/**
-* log specified, there must be a log element as:
-    <!-- for the log -->
-    <div class="alert alert-info fade in" id="txt_log">
-        <button type="button" class="close" data-dismiss="alert">×</button>
-        <strong><span id="txt_log_title">Usage:</span></strong>
-        <span id="txt_log_msg">创建会议室，或者加入会议室</span>
-    </div>
-*/
-function info(desc) {
-    $("#txt_log").addClass("alert-info").removeClass("alert-error").removeClass("alert-warn");
-    $("#txt_log_title").text("Info:");
-    $("#txt_log_msg").text(desc);
-}
-function warn(code, desc) {
-    $("#txt_log").removeClass("alert-info").removeClass("alert-error").addClass("alert-warn");
-    $("#txt_log_title").text("Warn:");
-    $("#txt_log_msg").text("code: " + code + ", " + desc);
-}
-function error(code, desc) {
-    $("#txt_log").removeClass("alert-info").addClass("alert-error").removeClass("alert-warn");
-    $("#txt_log_title").text("Error:");
-    $("#txt_log_msg").text("code: " + code + ", " + desc);
-}
-
 /**
 * parse the query string to object.
 */
@@ -247,10 +222,8 @@ function srs_init_publish(rtmp_url) {
     }
 }
 
-/**
-* when publisher ready, init the page elements.
-*/
-function srs_publisher_initialize_page(
+// without default values set.
+function srs_initialize_codec_page(
     cameras, microphones,
     sl_cameras, sl_microphones, sl_vcodec, sl_profile, sl_level, sl_gop, sl_size, sl_fps, sl_bitrate
 ) {
@@ -265,14 +238,36 @@ function srs_publisher_initialize_page(
             break;
         }
     }
+    // optional: select the first "integrated" signed.
+    for (var i = 0; i < cameras.length; i++) {
+        if (cameras[i].toLowerCase().indexOf("integrated") >= 0) {
+            $(sl_cameras + " option[value='" + i + "']").attr("selected", true);
+            break;
+        }
+    }
     
     $(sl_microphones).empty();
     for (var i = 0; i < microphones.length; i++) {
         $(sl_microphones).append("<option value='" + i + "'>" + microphones[i] + "</option");
     }
+    // optional: select the first no "default" signed.
+    for (var i = 0; i < microphones.length; i++) {
+        if (microphones[i].toLowerCase().indexOf("default") == -1) {
+            $(sl_microphones + " option[value='" + i + "']").attr("selected", true);
+            break;
+        }
+    }
+    // optional: select the first "realtek" signed.
+    for (var i = 0; i < microphones.length; i++) {
+        if (microphones[i].toLowerCase().indexOf("realtek") >= 0) {
+            $(sl_microphones + " option[value='" + i + "']").attr("selected", true);
+            break;
+        }
+    }
     
     $(sl_vcodec).empty();
     var vcodecs = ["h264", "vp6"];
+    vcodecs = ["h264"]; // h264 only.
     for (var i = 0; i < vcodecs.length; i++) {
         $(sl_vcodec).append("<option value='" + vcodecs[i] + "'>" + vcodecs[i] + "</option");
     }
@@ -282,7 +277,6 @@ function srs_publisher_initialize_page(
     for (var i = 0; i < profiles.length; i++) {
         $(sl_profile).append("<option value='" + profiles[i] + "'>" + profiles[i] + "</option");
     }
-    $(sl_profile + " option[value='main']").attr("selected", true);
     
     $(sl_level).empty();
     var levels = ["1", "1b", "1.1", "1.2", "1.3", 
@@ -290,7 +284,6 @@ function srs_publisher_initialize_page(
     for (var i = 0; i < levels.length; i++) {
         $(sl_level).append("<option value='" + levels[i] + "'>" + levels[i] + "</option");
     }
-    $(sl_level + " option[value='4.1']").attr("selected", true);
     
     $(sl_gop).empty();
     var gops = ["0.3", "0.5", "1", "2", "3", "4", 
@@ -298,7 +291,6 @@ function srs_publisher_initialize_page(
     for (var i = 0; i < gops.length; i++) {
         $(sl_gop).append("<option value='" + gops[i] + "'>" + gops[i] + "秒</option");
     }
-    $(sl_gop + " option[value='10']").attr("selected", true);
     
     $(sl_size).empty();
     var sizes = ["176x144", "320x240", "352x240", 
@@ -307,14 +299,12 @@ function srs_publisher_initialize_page(
     for (i = 0; i < sizes.length; i++) {
         $(sl_size).append("<option value='" + sizes[i] + "'>" + sizes[i] + "</option");
     }
-    $(sl_size + " option[value='640x480']").attr("selected", true);
     
     $(sl_fps).empty();
     var fpses = ["5", "10", "15", "20", "24", "25", "29.97", "30"];
     for (i = 0; i < fpses.length; i++) {
         $(sl_fps).append("<option value='" + fpses[i] + "'>" + Number(fpses[i]).toFixed(2) + " 帧/秒</option");
     }
-    $(sl_fps + " option[value='20']").attr("selected", true);
     
     $(sl_bitrate).empty();
     var bitrates = ["50", "200", "350", "500", "650", "800", 
@@ -322,6 +312,40 @@ function srs_publisher_initialize_page(
     for (i = 0; i < bitrates.length; i++) {
         $(sl_bitrate).append("<option value='" + bitrates[i] + "'>" + bitrates[i] + " kbps</option");
     }
+}
+/**
+* when publisher ready, init the page elements.
+*/
+function srs_publisher_initialize_page(
+    cameras, microphones,
+    sl_cameras, sl_microphones, sl_vcodec, sl_profile, sl_level, sl_gop, sl_size, sl_fps, sl_bitrate
+) {
+    srs_initialize_codec_page(
+        cameras, microphones,
+        sl_cameras, sl_microphones, sl_vcodec, sl_profile, sl_level, sl_gop, sl_size, sl_fps, sl_bitrate
+    );
+    
+    //var profiles = ["baseline", "main"];
+    $(sl_profile + " option[value='main']").attr("selected", true);
+    
+    //var levels = ["1", "1b", "1.1", "1.2", "1.3", 
+    //    "2", "2.1", "2.2", "3", "3.1", "3.2", "4", "4.1", "4.2", "5", "5.1"];
+    $(sl_level + " option[value='4.1']").attr("selected", true);
+    
+    //var gops = ["0.3", "0.5", "1", "2", "3", "4", 
+    //    "5", "6", "7", "8", "9", "10", "15", "20"];
+    $(sl_gop + " option[value='10']").attr("selected", true);
+    
+    //var sizes = ["176x144", "320x240", "352x240", 
+    //    "352x288", "460x240", "640x480", "720x480", "720x576", "800x600", 
+    //    "1024x768", "1280x720", "1360x768", "1920x1080"];
+    $(sl_size + " option[value='640x480']").attr("selected", true);
+    
+    //var fpses = ["5", "10", "15", "20", "24", "25", "29.97", "30"];
+    $(sl_fps + " option[value='20']").attr("selected", true);
+    
+    //var bitrates = ["50", "200", "350", "500", "650", "800", 
+    //    "950", "1000", "1200", "1500", "1800", "2000", "3000", "5000"];
     $(sl_bitrate + " option[value='500']").attr("selected", true);
 }
 /**
@@ -331,75 +355,33 @@ function srs_chat_initialize_page(
     cameras, microphones,
     sl_cameras, sl_microphones, sl_vcodec, sl_profile, sl_level, sl_gop, sl_size, sl_fps, sl_bitrate
 ) {
-    $(sl_cameras).empty();
-    for (var i = 0; i < cameras.length; i++) {
-        $(sl_cameras).append("<option value='" + i + "'>" + cameras[i] + "</option");
-    }
-    // optional: select the first no "virtual" signed.
-    for (var i = 0; i < cameras.length; i++) {
-        if (cameras[i].toLowerCase().indexOf("virtual") == -1) {
-            $(sl_cameras + " option[value='" + i + "']").attr("selected", true);
-            break;
-        }
-    }
+    srs_initialize_codec_page(
+        cameras, microphones,
+        sl_cameras, sl_microphones, sl_vcodec, sl_profile, sl_level, sl_gop, sl_size, sl_fps, sl_bitrate
+    );
     
-    $(sl_microphones).empty();
-    for (var i = 0; i < microphones.length; i++) {
-        $(sl_microphones).append("<option value='" + i + "'>" + microphones[i] + "</option");
-    }
-    
-    $(sl_vcodec).empty();
-    var vcodecs = ["h264", "vp6"];
-    for (var i = 0; i < vcodecs.length; i++) {
-        $(sl_vcodec).append("<option value='" + vcodecs[i] + "'>" + vcodecs[i] + "</option");
-    }
-    
-    $(sl_profile).empty();
-    var profiles = ["baseline", "main"];
-    for (var i = 0; i < profiles.length; i++) {
-        $(sl_profile).append("<option value='" + profiles[i] + "'>" + profiles[i] + "</option");
-    }
+    //var profiles = ["baseline", "main"];
     $(sl_profile + " option[value='baseline']").attr("selected", true);
     
-    $(sl_level).empty();
-    var levels = ["1", "1b", "1.1", "1.2", "1.3", 
-        "2", "2.1", "2.2", "3", "3.1", "3.2", "4", "4.1", "4.2", "5", "5.1"];
-    for (var i = 0; i < levels.length; i++) {
-        $(sl_level).append("<option value='" + levels[i] + "'>" + levels[i] + "</option");
-    }
-    $(sl_level + " option[value='3.1']").attr("selected", true);
+    //var levels = ["1", "1b", "1.1", "1.2", "1.3", 
+    //    "2", "2.1", "2.2", "3", "3.1", "3.2", "4", "4.1", "4.2", "5", "5.1"];
+    $(sl_level + " option[value='2.1']").attr("selected", true);
     
-    $(sl_gop).empty();
-    var gops = ["0.3", "0.5", "1", "2", "3", "4", 
-        "5", "6", "7", "8", "9", "10", "15", "20"];
-    for (var i = 0; i < gops.length; i++) {
-        $(sl_gop).append("<option value='" + gops[i] + "'>" + gops[i] + "秒</option");
-    }
+    //var gops = ["0.3", "0.5", "1", "2", "3", "4", 
+    //    "5", "6", "7", "8", "9", "10", "15", "20"];
     $(sl_gop + " option[value='0.5']").attr("selected", true);
     
-    $(sl_size).empty();
-    var sizes = ["176x144", "320x240", "352x240", 
-        "352x288", "460x240", "640x480", "720x480", "720x576", "800x600", 
-        "1024x768", "1280x720", "1360x768", "1920x1080"];
-    for (i = 0; i < sizes.length; i++) {
-        $(sl_size).append("<option value='" + sizes[i] + "'>" + sizes[i] + "</option");
-    }
-    $(sl_size + " option[value='460x240']").attr("selected", true);
+    //var sizes = ["176x144", "320x240", "352x240", 
+    //    "352x288", "460x240", "640x480", "720x480", "720x576", "800x600", 
+    //    "1024x768", "1280x720", "1360x768", "1920x1080"];
+    $(sl_size + " option[value='320x240']").attr("selected", true);
     
-    $(sl_fps).empty();
-    var fpses = ["5", "10", "15", "20", "24", "25", "29.97", "30"];
-    for (i = 0; i < fpses.length; i++) {
-        $(sl_fps).append("<option value='" + fpses[i] + "'>" + Number(fpses[i]).toFixed(2) + " 帧/秒</option");
-    }
-    $(sl_fps + " option[value='15']").attr("selected", true);
+    //var fpses = ["5", "10", "15", "20", "24", "25", "29.97", "30"];
+    $(sl_fps + " option[value='10']").attr("selected", true);
     
-    $(sl_bitrate).empty();
-    var bitrates = ["50", "200", "350", "500", "650", "800", 
-        "950", "1000", "1200", "1500", "1800", "2000", "3000", "5000"];
-    for (i = 0; i < bitrates.length; i++) {
-        $(sl_bitrate).append("<option value='" + bitrates[i] + "'>" + bitrates[i] + " kbps</option");
-    }
-    $(sl_bitrate + " option[value='350']").attr("selected", true);
+    //var bitrates = ["50", "200", "350", "500", "650", "800", 
+    //    "950", "1000", "1200", "1500", "1800", "2000", "3000", "5000"];
+    $(sl_bitrate + " option[value='200']").attr("selected", true);
 }
 /**
 * get the vcodec and acodec.
@@ -451,6 +433,7 @@ function SrsPlayer(container, width, height, private_object) {
     this.id = SrsPlayer.__id++;
     this.stream_url = null;
     this.buffer_time = 0.8; // default to 0.8
+    this.volume = 1.0; // default to 100%
     this.callbackObj = null;
     
     // callback set the following values.
@@ -502,12 +485,19 @@ SrsPlayer.prototype.start = function(url) {
 /**
 * play the stream.
 * @param stream_url the url of stream, rtmp or http.
+* @param volume the volume, 0 is mute, 1 is 100%, 2 is 200%.
 */
-SrsPlayer.prototype.play = function(url) {
+SrsPlayer.prototype.play = function(url, volume) {
     if (url) {
         this.stream_url = url;
     }
-    this.callbackObj.ref.__play(this.stream_url, this.width, this.height, this.buffer_time);
+    
+    // volume maybe 0, so never use if(volume) to check its value.
+    if (volume != null && volume != undefined) {
+        this.volume = volume;
+    }
+    
+    this.callbackObj.ref.__play(this.stream_url, this.width, this.height, this.buffer_time, this.volume);
 }
 SrsPlayer.prototype.stop = function() {
     for (var i = 0; i < SrsPlayer.__players.length; i++) {
@@ -652,7 +642,7 @@ function SrsPublisher(container, width, height, private_object) {
     this.errors = {
         "100": "无法获取指定的摄像头", //error_camera_get 
         "101": "无法获取指定的麦克风", //error_microphone_get 
-        "102": "摄像头为禁用状态，推流时请允许flash访问摄像头", //error_camera_muted 
+        "102": "摄像头为禁用状态，推流时请允许flash访问摄像头" //error_camera_muted 
     };
 }
 /**
diff --git a/trunk/research/players/js/srs.log.js b/trunk/research/players/js/srs.log.js
new file mode 100755
index 000000000..c3ffde5f5
--- /dev/null
+++ b/trunk/research/players/js/srs.log.js
@@ -0,0 +1,24 @@
+/**
+* log specified, there must be a log element as:
+    <!-- for the log -->
+    <div class="alert alert-info fade in" id="txt_log">
+        <button type="button" class="close" data-dismiss="alert">×</button>
+        <strong><span id="txt_log_title">标题:</span></strong>
+        <span id="txt_log_msg">日志内容</span>
+    </div>
+*/
+function info(desc) {
+    $("#txt_log").addClass("alert-info").removeClass("alert-error").removeClass("alert-warn");
+    $("#txt_log_title").text("Info:");
+    $("#txt_log_msg").text(desc);
+}
+function warn(code, desc) {
+    $("#txt_log").removeClass("alert-info").removeClass("alert-error").addClass("alert-warn");
+    $("#txt_log_title").text("Warn:");
+    $("#txt_log_msg").text("code: " + code + ", " + desc);
+}
+function error(code, desc) {
+    $("#txt_log").removeClass("alert-info").addClass("alert-error").removeClass("alert-warn");
+    $("#txt_log_title").text("Error:");
+    $("#txt_log_msg").text("code: " + code + ", " + desc);
+}
diff --git a/trunk/research/players/jwplayer6.html b/trunk/research/players/jwplayer6.html
index b63df87c2..e8daafc1f 100755
--- a/trunk/research/players/jwplayer6.html
+++ b/trunk/research/players/jwplayer6.html
@@ -7,6 +7,7 @@
     <script type="text/javascript" src="js/jquery-1.10.2.min.js"></script>
     <script type="text/javascript" src="js/bootstrap.min.js"></script>
     <script type="text/javascript" src="js/srs.js"></script>
+    <script type="text/javascript" src="js/srs.log.js"></script>
     <style>
         body{
             padding-top: 55px;
diff --git a/trunk/research/players/osmf.html b/trunk/research/players/osmf.html
index 4b8e92da9..5b56d5b2f 100755
--- a/trunk/research/players/osmf.html
+++ b/trunk/research/players/osmf.html
@@ -8,6 +8,7 @@
     <script type="text/javascript" src="js/bootstrap.min.js"></script>
     <script type="text/javascript" src="js/swfobject.js"></script>
     <script type="text/javascript" src="js/srs.js"></script>
+    <script type="text/javascript" src="js/srs.log.js"></script>
     <style>
         body{
             padding-top: 55px;
diff --git a/trunk/research/players/srs_bwt.html b/trunk/research/players/srs_bwt.html
index 9e2172a63..0eabae206 100755
--- a/trunk/research/players/srs_bwt.html
+++ b/trunk/research/players/srs_bwt.html
@@ -8,6 +8,7 @@
     <script type="text/javascript" src="js/bootstrap.min.js"></script>
     <script type="text/javascript" src="js/swfobject.js"></script>
     <script type="text/javascript" src="js/srs.js"></script>
+    <script type="text/javascript" src="js/srs.log.js"></script>
     <style>
         body{
             padding-top: 55px;
diff --git a/trunk/research/players/srs_chat.html b/trunk/research/players/srs_chat.html
index dc9e6ab89..19637fe0e 100755
--- a/trunk/research/players/srs_chat.html
+++ b/trunk/research/players/srs_chat.html
@@ -8,6 +8,7 @@
     <script type="text/javascript" src="js/bootstrap.min.js"></script>
     <script type="text/javascript" src="js/swfobject.js"></script>
     <script type="text/javascript" src="js/srs.js"></script>
+    <script type="text/javascript" src="js/srs.log.js"></script>
     <style>
         body{
             padding-top: 55px;
@@ -420,7 +421,7 @@
                     if (realtime_player) {
                         // directly play the url for the realtime player.
                         realtime_player.stop();
-                        realtime_player.play(url);
+                        realtime_player.play(url, 0);
                     }
                 }
             });
diff --git a/trunk/research/players/srs_player.html b/trunk/research/players/srs_player.html
index 9fab6b2ca..d1d6c5767 100755
--- a/trunk/research/players/srs_player.html
+++ b/trunk/research/players/srs_player.html
@@ -8,6 +8,7 @@
     <script type="text/javascript" src="js/bootstrap.min.js"></script>
     <script type="text/javascript" src="js/swfobject.js"></script>
     <script type="text/javascript" src="js/srs.js"></script>
+    <script type="text/javascript" src="js/srs.log.js"></script>
     <style>
         body{
             padding-top: 55px;
diff --git a/trunk/research/players/srs_player/release/srs_player.swf b/trunk/research/players/srs_player/release/srs_player.swf
index d129187e3..ef6135348 100755
Binary files a/trunk/research/players/srs_player/release/srs_player.swf and b/trunk/research/players/srs_player/release/srs_player.swf differ
diff --git a/trunk/research/players/srs_player/src/srs_player.as b/trunk/research/players/srs_player/src/srs_player.as
index 84a27b619..07b36a7a0 100755
--- a/trunk/research/players/srs_player/src/srs_player.as
+++ b/trunk/research/players/srs_player/src/srs_player.as
@@ -10,6 +10,7 @@ package
     import flash.events.NetStatusEvent;
     import flash.events.TimerEvent;
     import flash.external.ExternalInterface;
+    import flash.media.SoundTransform;
     import flash.media.Video;
     import flash.net.NetConnection;
     import flash.net.NetStream;
@@ -19,6 +20,8 @@ package
     import flash.utils.Timer;
     import flash.utils.setTimeout;
     
+    import flashx.textLayout.formats.Float;
+    
     public class srs_player extends Sprite
     {
         // user set id.
@@ -280,8 +283,9 @@ package
          * @param _width, the player width.
          * @param _height, the player height.
          * @param buffer_time, the buffer time in seconds. recommend to >=0.5
+         * @param volume, the volume, 0 is mute, 1 is 100%, 2 is 200%.
          */
-        private function js_call_play(url:String, _width:int, _height:int, buffer_time:Number):void {
+        private function js_call_play(url:String, _width:int, _height:int, buffer_time:Number, volume:Number):void {
             this.user_url = url;
             this.user_w = _width;
             this.user_h = _height;
@@ -313,6 +317,7 @@ package
                 }
                 
                 media_stream = new NetStream(media_conn);
+                media_stream.soundTransform = new SoundTransform(volume);
                 media_stream.bufferTime = buffer_time;
                 media_stream.client = {};
                 media_stream.client.onMetaData = system_on_metadata;
diff --git a/trunk/research/players/srs_publisher.html b/trunk/research/players/srs_publisher.html
index cb3a4cae5..9deb86ebe 100755
--- a/trunk/research/players/srs_publisher.html
+++ b/trunk/research/players/srs_publisher.html
@@ -8,6 +8,7 @@
     <script type="text/javascript" src="js/bootstrap.min.js"></script>
     <script type="text/javascript" src="js/swfobject.js"></script>
     <script type="text/javascript" src="js/srs.js"></script>
+    <script type="text/javascript" src="js/srs.log.js"></script>
     <style>
         body{
             padding-top: 55px;
diff --git a/trunk/research/players/srs_publisher/release/srs_publisher.swf b/trunk/research/players/srs_publisher/release/srs_publisher.swf
index b9aaf4934..745b401fa 100755
Binary files a/trunk/research/players/srs_publisher/release/srs_publisher.swf and b/trunk/research/players/srs_publisher/release/srs_publisher.swf differ
diff --git a/trunk/research/players/srs_publisher/src/srs_publisher.as b/trunk/research/players/srs_publisher/src/srs_publisher.as
index 9baafe397..8d63004d3 100755
--- a/trunk/research/players/srs_publisher/src/srs_publisher.as
+++ b/trunk/research/players/srs_publisher/src/srs_publisher.as
@@ -10,6 +10,9 @@ package
     import flash.media.H264Profile;
     import flash.media.H264VideoStreamSettings;
     import flash.media.Microphone;
+    import flash.media.MicrophoneEnhancedMode;
+    import flash.media.MicrophoneEnhancedOptions;
+    import flash.media.SoundCodec;
     import flash.media.Video;
     import flash.net.NetConnection;
     import flash.net.NetStream;
@@ -135,27 +138,31 @@ package
             this.js_call_stop();
             
             // microphone and camera
-            var m:Microphone = Microphone.getMicrophone(acodec.device_code);
-            if(m == null){
+            var microphone:Microphone = null;
+            //microphone = Microphone.getEnhancedMicrophone(acodec.device_code);
+            if (!microphone) {
+                microphone = Microphone.getMicrophone(acodec.device_code);
+            }
+            if(microphone == null){
                 this.system_error(this.error_microphone_get, "failed to open microphone " + acodec.device_code + "(" + acodec.device_name + ")");
                 return;
             }
             // ignore muted, for flash will require user to access it.
             
             // Remark: the name is the index!
-            var c:Camera = Camera.getCamera(vcodec.device_code);
-            if(c == null){
+            var camera:Camera = Camera.getCamera(vcodec.device_code);
+            if(camera == null){
                 this.system_error(this.error_camera_get, "failed to open camera " + vcodec.device_code + "(" + vcodec.device_name + ")");
                 return;
             }
             // ignore muted, for flash will require user to access it.
             // but we still warn user.
-            if(c && c.muted){
+            if(camera && camera.muted){
                 this.system_warn(this.error_camera_muted, "Access Denied, camera " + vcodec.device_code + "(" + vcodec.device_name + ") is muted");
             }
             
-            this.media_camera = c;
-            this.media_microphone = m;
+            this.media_camera = camera;
+            this.media_microphone = microphone;
             
             this.media_conn = new NetConnection();
             this.media_conn.client = {};
@@ -188,14 +195,14 @@ package
                     // TODO: FIXME: failed event.
                 });
                 
-                __build_video_codec(media_stream, c, vcodec);
-                __build_audio_codec(media_stream, m, acodec);
+                __build_video_codec(media_stream, camera, vcodec);
+                __build_audio_codec(media_stream, microphone, acodec);
                 
                 if (media_microphone) {
-                    media_stream.attachAudio(m);
+                    media_stream.attachAudio(microphone);
                 }
                 if (media_camera) {
-                    media_stream.attachCamera(c);
+                    media_stream.attachCamera(camera);
                 }
                 
                 var streamName:String = url.substr(url.lastIndexOf("/"));
@@ -264,6 +271,10 @@ package
             // if your sound capture device supports this value. Otherwise, the default value is the next available capture level above 8 kHz that 
             // your sound capture device supports, usually 11 kHz.
             m.rate = microRate;
+            
+            // see: http://www.adobe.com/cn/devnet/flashplayer/articles/acoustic-echo-cancellation.html
+            m.codec = SoundCodec.SPEEX;
+            m.framesPerPacket = 1;
         }
         private function __build_video_codec(stream:NetStream, c:Camera, vcodec:Object):void {
             if (!c) {
@@ -332,9 +343,9 @@ package
             //		(highest quality, no compression). To specify that picture quality can vary as needed to avoid exceeding bandwidth, 
             //		pass 0 for quality.
             //  winlin:
-            //		bandwidth is in bps not kbps. 500*1000 = 500kbps.
+            //		bandwidth is in Bps not kbps. 
             //		quality=1 is lowest quality, 100 is highest quality.
-            c.setQuality(cameraBitrate * 1000, cameraQuality);
+            c.setQuality(cameraBitrate / 8.0 * 1000, cameraQuality);
         }
     }
 }
\ No newline at end of file
diff --git a/trunk/research/players/vlc.html b/trunk/research/players/vlc.html
index f8f977b3d..f9644d013 100755
--- a/trunk/research/players/vlc.html
+++ b/trunk/research/players/vlc.html
@@ -8,6 +8,7 @@
     <script type="text/javascript" src="js/bootstrap.min.js"></script>
     <script type="text/javascript" src="js/swfobject.js"></script>
     <script type="text/javascript" src="js/srs.js"></script>
+    <script type="text/javascript" src="js/srs.log.js"></script>
     <style>
         body{
             padding-top: 55px;