diff --git a/trunk/conf/full.conf b/trunk/conf/full.conf
index 362d603ee..3a97603f9 100644
--- a/trunk/conf/full.conf
+++ b/trunk/conf/full.conf
@@ -943,6 +943,16 @@ vhost exec.srs.com {
     }
 }
 
+# The vhost for MPEG-DASH.
+vhost dash.srs.com {
+    dash {
+        # Whether DASH is enabled.
+        # Transmux RTMP to DASH if on.
+        # default: off
+        enabled         on;
+    }
+}
+
 # the vhost with hls specified.
 vhost hls.srs.com {
     hls {
diff --git a/trunk/src/app/srs_app_config.cpp b/trunk/src/app/srs_app_config.cpp
index 1a86c03d2..60e2e2b09 100644
--- a/trunk/src/app/srs_app_config.cpp
+++ b/trunk/src/app/srs_app_config.cpp
@@ -1353,6 +1353,18 @@ int SrsConfig::reload_vhost(SrsConfDirective* old_root)
                 srs_trace("vhost %s reload forward success.", vhost.c_str());
             }
             
+            // To reload DASH.
+            if (!srs_directive_equals(new_vhost->get("dash"), old_vhost->get("dash"))) {
+                for (it = subscribes.begin(); it != subscribes.end(); ++it) {
+                    ISrsReloadHandler* subscribe = *it;
+                    if ((ret = subscribe->on_reload_vhost_dash(vhost)) != ERROR_SUCCESS) {
+                        srs_error("Reload vhost %s dash failed, ret=%d", vhost.c_str(), ret);
+                        return ret;
+                    }
+                }
+                srs_trace("Reload vhost %s dash ok.", vhost.c_str());
+            }
+            
             // hls, only one per vhost
             // @remark, the hls_on_error directly support reload.
             if (!srs_directive_equals(new_vhost->get("hls"), old_vhost->get("hls"))) {
@@ -3808,7 +3820,7 @@ int SrsConfig::check_config()
                 && n != "dvr" && n != "ingest" && n != "hls" && n != "http_hooks"
                 && n != "refer" && n != "forward" && n != "transcode" && n != "bandcheck"
                 && n != "play" && n != "publish" && n != "cluster"
-                && n != "security" && n != "http_remux"
+                && n != "security" && n != "http_remux" && n != "dash"
                 && n != "http_static" && n != "hds" && n != "exec"
                 && n != "in_ack_size" && n != "out_ack_size"
             ) {
@@ -3819,7 +3831,7 @@ int SrsConfig::check_config()
             // for each sub directives of vhost.
             if (n == "dvr") {
                 for (int j = 0; j < (int)conf->directives.size(); j++) {
-                    string m = conf->at(j)->name.c_str();
+                    string m = conf->at(j)->name;
                     if (m != "enabled"  && m != "dvr_apply" && m != "dvr_path" && m != "dvr_plan"
                         && m != "dvr_duration" && m != "dvr_wait_keyframe" && m != "time_jitter"
                     ) {
@@ -3830,7 +3842,7 @@ int SrsConfig::check_config()
                 }
             } else if (n == "refer") {
                 for (int j = 0; j < (int)conf->directives.size(); j++) {
-                    string m = conf->at(j)->name.c_str();
+                    string m = conf->at(j)->name;
                     if (m != "enabled" && m != "all" && m != "publish" && m != "play") {
                         ret = ERROR_SYSTEM_CONFIG_INVALID;
                         srs_error("unsupported vhost refer directive %s, ret=%d", m.c_str(), ret);
@@ -3839,7 +3851,7 @@ int SrsConfig::check_config()
                 }
             } else if (n == "exec") {
                 for (int j = 0; j < (int)conf->directives.size(); j++) {
-                    string m = conf->at(j)->name.c_str();
+                    string m = conf->at(j)->name;
                     if (m != "enabled" && m != "publish") {
                         ret = ERROR_SYSTEM_CONFIG_INVALID;
                         srs_error("unsupported vhost exec directive %s, ret=%d", m.c_str(), ret);
@@ -3848,7 +3860,7 @@ int SrsConfig::check_config()
                 }
             } else if (n == "play") {
                 for (int j = 0; j < (int)conf->directives.size(); j++) {
-                    string m = conf->at(j)->name.c_str();
+                    string m = conf->at(j)->name;
                     if (m != "time_jitter" && m != "mix_correct" && m != "atc" && m != "atc_auto" && m != "mw_latency"
                         && m != "gop_cache" && m != "queue_length" && m != "send_min_interval" && m != "reduce_sequence_header"
                     ) {
@@ -3859,7 +3871,7 @@ int SrsConfig::check_config()
                 }
             } else if (n == "cluster") {
                 for (int j = 0; j < (int)conf->directives.size(); j++) {
-                    string m = conf->at(j)->name.c_str();
+                    string m = conf->at(j)->name;
                     if (m != "mode" && m != "origin" && m != "token_traverse" && m != "vhost" && m != "debug_srs_upnode") {
                         ret = ERROR_SYSTEM_CONFIG_INVALID;
                         srs_error("unsupported vhost cluster directive %s, ret=%d", m.c_str(), ret);
@@ -3868,7 +3880,7 @@ int SrsConfig::check_config()
                 }
             } else if (n == "publish") {
                 for (int j = 0; j < (int)conf->directives.size(); j++) {
-                    string m = conf->at(j)->name.c_str();
+                    string m = conf->at(j)->name;
                     if (m != "mr" && m != "mr_latency" && m != "firstpkt_timeout" && m != "normal_timeout" && m != "parse_sps") {
                         ret = ERROR_SYSTEM_CONFIG_INVALID;
                         srs_error("unsupported vhost publish directive %s, ret=%d", m.c_str(), ret);
@@ -3877,7 +3889,7 @@ int SrsConfig::check_config()
                 }
             } else if (n == "ingest") {
                 for (int j = 0; j < (int)conf->directives.size(); j++) {
-                    string m = conf->at(j)->name.c_str();
+                    string m = conf->at(j)->name;
                     if (m != "enabled" && m != "input" && m != "ffmpeg" && m != "engine") {
                         ret = ERROR_SYSTEM_CONFIG_INVALID;
                         srs_error("unsupported vhost ingest directive %s, ret=%d", m.c_str(), ret);
@@ -3886,7 +3898,7 @@ int SrsConfig::check_config()
                 }
             } else if (n == "http_static") {
                 for (int j = 0; j < (int)conf->directives.size(); j++) {
-                    string m = conf->at(j)->name.c_str();
+                    string m = conf->at(j)->name;
                     if (m != "enabled" && m != "mount" && m != "dir") {
                         ret = ERROR_SYSTEM_CONFIG_INVALID;
                         srs_error("unsupported vhost http directive %s, ret=%d", m.c_str(), ret);
@@ -3895,16 +3907,25 @@ int SrsConfig::check_config()
                 }
             } else if (n == "http_remux") {
                 for (int j = 0; j < (int)conf->directives.size(); j++) {
-                    string m = conf->at(j)->name.c_str();
+                    string m = conf->at(j)->name;
                     if (m != "enabled" && m != "mount" && m != "fast_cache") {
                         ret = ERROR_SYSTEM_CONFIG_INVALID;
                         srs_error("unsupported vhost http_remux directive %s, ret=%d", m.c_str(), ret);
                         return ret;
                     }
                 }
+            } else if (n == "dash") {
+                for (int j = 0; j < (int)conf->directives.size(); j++) {
+                    string m = conf->at(j)->name;
+                    if (m != "enabled") {
+                        ret = ERROR_SYSTEM_CONFIG_INVALID;
+                        srs_error("Illegal directive %s in vhost.dash, ret=%d", m.c_str(), ret);
+                        return ret;
+                    }
+                }
             } else if (n == "hls") {
                 for (int j = 0; j < (int)conf->directives.size(); j++) {
-                    string m = conf->at(j)->name.c_str();
+                    string m = conf->at(j)->name;
                     if (m != "enabled" && m != "hls_entry_prefix" && m != "hls_path" && m != "hls_fragment" && m != "hls_window" && m != "hls_on_error"
                         && m != "hls_storage" && m != "hls_mount" && m != "hls_td_ratio" && m != "hls_aof_ratio" && m != "hls_acodec" && m != "hls_vcodec"
                         && m != "hls_m3u8_file" && m != "hls_ts_file" && m != "hls_ts_floor" && m != "hls_cleanup" && m != "hls_nb_notify"
@@ -3922,7 +3943,7 @@ int SrsConfig::check_config()
                 }
             } else if (n == "http_hooks") {
                 for (int j = 0; j < (int)conf->directives.size(); j++) {
-                    string m = conf->at(j)->name.c_str();
+                    string m = conf->at(j)->name;
                     if (m != "enabled" && m != "on_connect" && m != "on_close" && m != "on_publish"
                         && m != "on_unpublish" && m != "on_play" && m != "on_stop"
                         && m != "on_dvr" && m != "on_hls" && m != "on_hls_notify"
@@ -3934,7 +3955,7 @@ int SrsConfig::check_config()
                 }
             } else if (n == "forward") {
                 for (int j = 0; j < (int)conf->directives.size(); j++) {
-                    string m = conf->at(j)->name.c_str();
+                    string m = conf->at(j)->name;
                     if (m != "enabled" && m != "destination") {
                         ret = ERROR_SYSTEM_CONFIG_INVALID;
                         srs_error("unsupported vhost forward directive %s, ret=%d", m.c_str(), ret);
@@ -3979,7 +4000,7 @@ int SrsConfig::check_config()
                 }
             } else if (n == "bandcheck") {
                 for (int j = 0; j < (int)conf->directives.size(); j++) {
-                    string m = conf->at(j)->name.c_str();
+                    string m = conf->at(j)->name;
                     if (m != "enabled" && m != "key" && m != "interval" && m != "limit_kbps") {
                         ret = ERROR_SYSTEM_CONFIG_INVALID;
                         srs_error("unsupported vhost bandcheck directive %s, ret=%d", m.c_str(), ret);
@@ -5944,15 +5965,33 @@ string SrsConfig::get_ffmpeg_log_dir()
     return conf->arg0();
 }
 
+SrsConfDirective* SrsConfig::get_dash(string vhost)
+{
+    SrsConfDirective* conf = get_vhost(vhost);
+    return conf? conf->get("dash") : NULL;
+}
+
+bool SrsConfig::get_dash_enabled(string vhost)
+{
+    static bool DEFAULT = false;
+    
+    SrsConfDirective* conf = get_dash(vhost);
+    if (!conf) {
+        return DEFAULT;
+    }
+    
+    conf = conf->get("enabled");
+    if (!conf || conf->arg0().empty()) {
+        return DEFAULT;
+    }
+    
+    return SRS_CONF_PERFER_FALSE(conf->arg0());
+}
+
 SrsConfDirective* SrsConfig::get_hls(string vhost)
 {
     SrsConfDirective* conf = get_vhost(vhost);
-
-    if (!conf) {
-        return NULL;
-    }
-    
-    return conf->get("hls");
+    return conf? conf->get("hls") : NULL;
 }
 
 bool SrsConfig::get_hls_enabled(string vhost)
diff --git a/trunk/src/app/srs_app_config.hpp b/trunk/src/app/srs_app_config.hpp
index c658bc4d9..fc9a7188e 100644
--- a/trunk/src/app/srs_app_config.hpp
+++ b/trunk/src/app/srs_app_config.hpp
@@ -1134,6 +1134,12 @@ public:
     * @remark, /dev/null to disable it.
     */
     virtual std::string         get_ffmpeg_log_dir();
+// The MPEG-DASH section.
+private:
+    virtual SrsConfDirective*   get_dash(std::string vhost);
+public:
+    // Whether DASH is enabled.
+    virtual bool                get_dash_enabled(std::string vhost);
 // hls section
 private:
     /**
diff --git a/trunk/src/app/srs_app_dash.cpp b/trunk/src/app/srs_app_dash.cpp
index 0ffa7de99..8513d6d2c 100644
--- a/trunk/src/app/srs_app_dash.cpp
+++ b/trunk/src/app/srs_app_dash.cpp
@@ -23,4 +23,80 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <srs_app_dash.hpp>
 
+#include <srs_kernel_error.hpp>
+#include <srs_app_source.hpp>
+#include <srs_app_config.hpp>
+#include <srs_rtmp_stack.hpp>
+
+SrsMpegDash::SrsMpegDash()
+{
+    hub = NULL;
+    req = NULL;
+    
+    enabled = false;
+}
+
+SrsMpegDash::~SrsMpegDash()
+{
+}
+
+int SrsMpegDash::initialize(SrsOriginHub* h, SrsRequest* r)
+{
+    int ret = ERROR_SUCCESS;
+    
+    hub = h;
+    req = r;
+    
+    return ret;
+}
+
+int SrsMpegDash::on_publish()
+{
+    int ret = ERROR_SUCCESS;
+    
+    // Prevent duplicated publish.
+    if (enabled) {
+        return ret;
+    }
+    
+    if (!_srs_config->get_dash_enabled(req->vhost)) {
+        return ret;
+    }
+    
+    enabled = true;
+    
+    return ret;
+}
+
+int SrsMpegDash::on_audio(SrsSharedPtrMessage* shared_audio)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if (!enabled) {
+        return ret;
+    }
+    
+    return ret;
+}
+
+int SrsMpegDash::on_video(SrsSharedPtrMessage* shared_video, bool is_sequence_header)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if (!enabled) {
+        return ret;
+    }
+    
+    return ret;
+}
+
+void SrsMpegDash::on_unpublish()
+{
+    // Prevent duplicated unpublish.
+    if (!enabled) {
+        return;
+    }
+    
+    enabled = false;
+}
 
diff --git a/trunk/src/app/srs_app_dash.hpp b/trunk/src/app/srs_app_dash.hpp
index 1b30b5cff..b623a62ab 100644
--- a/trunk/src/app/srs_app_dash.hpp
+++ b/trunk/src/app/srs_app_dash.hpp
@@ -29,4 +29,34 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 #include <srs_core.hpp>
 
+class SrsRequest;
+class SrsOriginHub;
+class SrsSharedPtrMessage;
+
+/**
+ * The MPEG-DASH encoder, transmux RTMP to DASH.
+ */
+class SrsMpegDash
+{
+private:
+    bool enabled;
+private:
+    SrsRequest* req;
+    SrsOriginHub* hub;
+public:
+    SrsMpegDash();
+    virtual ~SrsMpegDash();
+public:
+    // Initalize the encoder.
+    virtual int initialize(SrsOriginHub* h, SrsRequest* r);
+    // When stream start publishing.
+    virtual int on_publish();
+    // When got an shared audio message.
+    virtual int on_audio(SrsSharedPtrMessage* shared_audio);
+    // When got an shared video message.
+    virtual int on_video(SrsSharedPtrMessage* shared_video, bool is_sequence_header);
+    // When stream stop publishing.
+    virtual void on_unpublish();
+};
+
 #endif
diff --git a/trunk/src/app/srs_app_dvr.cpp b/trunk/src/app/srs_app_dvr.cpp
index 07b5d3cf1..812d78c5f 100644
--- a/trunk/src/app/srs_app_dvr.cpp
+++ b/trunk/src/app/srs_app_dvr.cpp
@@ -1019,7 +1019,7 @@ int SrsDvr::initialize(SrsOriginHub* h, SrsRequest* r)
     return ret;
 }
 
-int SrsDvr::on_publish(bool fetch_sequence_header)
+int SrsDvr::on_publish()
 {
     int ret = ERROR_SUCCESS;
     
@@ -1032,10 +1032,6 @@ int SrsDvr::on_publish(bool fetch_sequence_header)
         return ret;
     }
     
-    if (fetch_sequence_header && (ret = hub->on_dvr_request_sh()) != ERROR_SUCCESS) {
-        return ret;
-    }
-    
     return ret;
 }
 
@@ -1088,11 +1084,21 @@ int SrsDvr::on_reload_vhost_dvr_apply(string vhost)
     bool v = srs_config_apply_filter(conf, req);
     
     // the apply changed, republish the dvr.
-    if (v != actived) {
-        actived = v;
-        
-        on_unpublish();
-        return on_publish(true);
+    if (v == actived) {
+        return ret;
+    }
+    actived = v;
+    
+    on_unpublish();
+    if (!actived) {
+        return ret;
+    }
+    
+    if ((ret = on_publish()) != ERROR_SUCCESS) {
+        return ret;
+    }
+    if ((ret = hub->on_dvr_request_sh()) != ERROR_SUCCESS) {
+        return ret;
     }
     
     return ret;
diff --git a/trunk/src/app/srs_app_dvr.hpp b/trunk/src/app/srs_app_dvr.hpp
index 8f270f813..d57e06ee4 100644
--- a/trunk/src/app/srs_app_dvr.hpp
+++ b/trunk/src/app/srs_app_dvr.hpp
@@ -289,7 +289,7 @@ public:
      * when encoder start to publish RTMP stream.
      * @param fetch_sequence_header whether fetch sequence from source.
      */
-    virtual int on_publish(bool fetch_sequence_header);
+    virtual int on_publish();
     /**
     * the unpublish event.,
     * when encoder stop(unpublish) to publish RTMP stream.
diff --git a/trunk/src/app/srs_app_hds.cpp b/trunk/src/app/srs_app_hds.cpp
index 3c146adfc..c98d6eb48 100644
--- a/trunk/src/app/srs_app_hds.cpp
+++ b/trunk/src/app/srs_app_hds.cpp
@@ -260,7 +260,7 @@ private:
     string path;
 };
 
-SrsHds::SrsHds(SrsSource *s)
+SrsHds::SrsHds()
     : currentSegment(NULL)
     , fragment_index(1)
     , video_sh(NULL)
@@ -273,7 +273,6 @@ SrsHds::SrsHds(SrsSource *s)
 
 SrsHds::~SrsHds()
 {
-
 }
 
 int SrsHds::on_publish(SrsRequest *req)
diff --git a/trunk/src/app/srs_app_hds.hpp b/trunk/src/app/srs_app_hds.hpp
index f0305f542..d41fa5c86 100644
--- a/trunk/src/app/srs_app_hds.hpp
+++ b/trunk/src/app/srs_app_hds.hpp
@@ -38,8 +38,8 @@ class SrsSource;
 class SrsHds
 {
 public:
-    SrsHds(SrsSource* s);
-    ~SrsHds();
+    SrsHds();
+    virtual ~SrsHds();
 
     int on_publish(SrsRequest* req);
     int on_unpublish();
diff --git a/trunk/src/app/srs_app_hls.cpp b/trunk/src/app/srs_app_hls.cpp
index 0b13cf141..e54555d11 100644
--- a/trunk/src/app/srs_app_hls.cpp
+++ b/trunk/src/app/srs_app_hls.cpp
@@ -1118,8 +1118,8 @@ SrsHls::SrsHls()
     req = NULL;
     hub = NULL;
     
-    hls_enabled = false;
-    hls_can_dispose = false;
+    enabled = false;
+    disposable = false;
     last_update_time = 0;
 
     codec = new SrsAvcAacCodec();
@@ -1127,7 +1127,7 @@ SrsHls::SrsHls()
     jitter = new SrsRtmpJitter();
     
     muxer = new SrsHlsMuxer();
-    hls_cache = new SrsHlsCache();
+    cache = new SrsHlsCache();
 
     pprint = SrsPithyPrint::create_hls();
     stream_dts = 0;
@@ -1140,14 +1140,14 @@ SrsHls::~SrsHls()
     srs_freep(jitter);
     
     srs_freep(muxer);
-    srs_freep(hls_cache);
+    srs_freep(cache);
     
     srs_freep(pprint);
 }
 
 void SrsHls::dispose()
 {
-    if (hls_enabled) {
+    if (enabled) {
         on_unpublish();
     }
     
@@ -1177,10 +1177,10 @@ int SrsHls::cycle()
     }
     last_update_time = srs_get_system_time_ms();
     
-    if (!hls_can_dispose) {
+    if (!disposable) {
         return ret;
     }
-    hls_can_dispose = false;
+    disposable = false;
     
     srs_trace("hls cycle to dispose hls %s, timeout=%dms", req->get_stream_url().c_str(), hls_dispose);
     dispose();
@@ -1202,7 +1202,7 @@ int SrsHls::initialize(SrsOriginHub* h, SrsRequest* r)
     return ret;
 }
 
-int SrsHls::on_publish(bool fetch_sequence_header)
+int SrsHls::on_publish()
 {
     int ret = ERROR_SUCCESS;
     
@@ -1210,36 +1210,23 @@ int SrsHls::on_publish(bool fetch_sequence_header)
     last_update_time = srs_get_system_time_ms();
     
     // support multiple publish.
-    if (hls_enabled) {
+    if (enabled) {
         return ret;
     }
     
-    std::string vhost = req->vhost;
-    if (!_srs_config->get_hls_enabled(vhost)) {
+    if (!_srs_config->get_hls_enabled(req->vhost)) {
         return ret;
     }
     
-    if ((ret = hls_cache->on_publish(muxer, req, stream_dts)) != ERROR_SUCCESS) {
+    if ((ret = cache->on_publish(muxer, req, stream_dts)) != ERROR_SUCCESS) {
         return ret;
     }
     
     // if enabled, open the muxer.
-    hls_enabled = true;
+    enabled = true;
     
     // ok, the hls can be dispose, or need to be dispose.
-    hls_can_dispose = true;
-    
-    // when publish, don't need to fetch sequence header, which is old and maybe corrupt.
-    // when reload, we must fetch the sequence header from source cache.
-    if (fetch_sequence_header) {
-        // notice the source to get the cached sequence header.
-        // when reload to start hls, hls will never get the sequence header in stream,
-        // use the SrsSource.on_hls_start to push the sequence header to HLS.
-        if ((ret = hub->on_hls_start()) != ERROR_SUCCESS) {
-            srs_error("callback source hls start failed. ret=%d", ret);
-            return ret;
-        }
-    }
+    disposable = true;
 
     return ret;
 }
@@ -1249,22 +1236,22 @@ void SrsHls::on_unpublish()
     int ret = ERROR_SUCCESS;
     
     // support multiple unpublish.
-    if (!hls_enabled) {
+    if (!enabled) {
         return;
     }
 
-    if ((ret = hls_cache->on_unpublish(muxer)) != ERROR_SUCCESS) {
+    if ((ret = cache->on_unpublish(muxer)) != ERROR_SUCCESS) {
         srs_error("ignore m3u8 muxer flush/close audio failed. ret=%d", ret);
     }
     
-    hls_enabled = false;
+    enabled = false;
 }
 
 int SrsHls::on_audio(SrsSharedPtrMessage* shared_audio)
 {
     int ret = ERROR_SUCCESS;
     
-    if (!hls_enabled) {
+    if (!enabled) {
         return ret;
     }
     
@@ -1302,7 +1289,7 @@ int SrsHls::on_audio(SrsSharedPtrMessage* shared_audio)
     
     // ignore sequence header
     if (acodec == SrsCodecAudioAAC && sample->aac_packet_type == SrsCodecAudioTypeSequenceHeader) {
-        return hls_cache->on_sequence_header(muxer);
+        return cache->on_sequence_header(muxer);
     }
     
     // TODO: FIXME: config the jitter of HLS.
@@ -1317,7 +1304,7 @@ int SrsHls::on_audio(SrsSharedPtrMessage* shared_audio)
     // for pure audio, we need to update the stream dts also.
     stream_dts = dts;
     
-    if ((ret = hls_cache->write_audio(codec, muxer, dts, sample)) != ERROR_SUCCESS) {
+    if ((ret = cache->write_audio(codec, muxer, dts, sample)) != ERROR_SUCCESS) {
         srs_error("hls cache write audio failed. ret=%d", ret);
         return ret;
     }
@@ -1329,7 +1316,7 @@ int SrsHls::on_video(SrsSharedPtrMessage* shared_video, bool is_sps_pps)
 {
     int ret = ERROR_SUCCESS;
     
-    if (!hls_enabled) {
+    if (!enabled) {
         return ret;
     }
     
@@ -1366,7 +1353,7 @@ int SrsHls::on_video(SrsSharedPtrMessage* shared_video, bool is_sps_pps)
     // ignore sequence header
     if (sample->frame_type == SrsCodecVideoAVCFrameKeyFrame
          && sample->avc_packet_type == SrsCodecVideoAVCTypeSequenceHeader) {
-        return hls_cache->on_sequence_header(muxer);
+        return cache->on_sequence_header(muxer);
     }
     
     // TODO: FIXME: config the jitter of HLS.
@@ -1377,7 +1364,7 @@ int SrsHls::on_video(SrsSharedPtrMessage* shared_video, bool is_sps_pps)
     
     int64_t dts = video->timestamp * 90;
     stream_dts = dts;
-    if ((ret = hls_cache->write_video(codec, muxer, dts, sample)) != ERROR_SUCCESS) {
+    if ((ret = cache->write_video(codec, muxer, dts, sample)) != ERROR_SUCCESS) {
         srs_error("hls cache write video failed. ret=%d", ret);
         return ret;
     }
diff --git a/trunk/src/app/srs_app_hls.hpp b/trunk/src/app/srs_app_hls.hpp
index e9285f200..dc856266c 100644
--- a/trunk/src/app/srs_app_hls.hpp
+++ b/trunk/src/app/srs_app_hls.hpp
@@ -351,11 +351,11 @@ class SrsHls
 {
 private:
     SrsHlsMuxer* muxer;
-    SrsHlsCache* hls_cache;
+    SrsHlsCache* cache;
 private:
     SrsRequest* req;
-    bool hls_enabled;
-    bool hls_can_dispose;
+    bool enabled;
+    bool disposable;
     int64_t last_update_time;
 private:
     SrsOriginHub* hub;
@@ -393,7 +393,7 @@ public:
      * for the muxer object not destroyed.
      * @param fetch_sequence_header whether fetch sequence from source.
      */
-    virtual int on_publish(bool fetch_sequence_header);
+    virtual int on_publish();
     /**
     * the unpublish event, only close the muxer, donot destroy the 
     * muxer, for when we continue to publish, the m3u8 will continue.
diff --git a/trunk/src/app/srs_app_log.cpp b/trunk/src/app/srs_app_log.cpp
index c105b58e1..fe589cee6 100644
--- a/trunk/src/app/srs_app_log.cpp
+++ b/trunk/src/app/srs_app_log.cpp
@@ -147,7 +147,7 @@ void SrsFastLog::verbose(const char* tag, int context_id, const char* fmt, ...)
     }
     
     int size = 0;
-    if (!generate_header(false, tag, context_id, "verb", &size)) {
+    if (!generate_header(false, tag, context_id, "Verb", &size)) {
         return;
     }
     
@@ -167,7 +167,7 @@ void SrsFastLog::info(const char* tag, int context_id, const char* fmt, ...)
     }
     
     int size = 0;
-    if (!generate_header(false, tag, context_id, "debug", &size)) {
+    if (!generate_header(false, tag, context_id, "Debug", &size)) {
         return;
     }
     
@@ -187,7 +187,7 @@ void SrsFastLog::trace(const char* tag, int context_id, const char* fmt, ...)
     }
     
     int size = 0;
-    if (!generate_header(false, tag, context_id, "trace", &size)) {
+    if (!generate_header(false, tag, context_id, "Trace", &size)) {
         return;
     }
     
@@ -207,7 +207,7 @@ void SrsFastLog::warn(const char* tag, int context_id, const char* fmt, ...)
     }
     
     int size = 0;
-    if (!generate_header(true, tag, context_id, "warn", &size)) {
+    if (!generate_header(true, tag, context_id, "Warn", &size)) {
         return;
     }
     
@@ -227,7 +227,7 @@ void SrsFastLog::error(const char* tag, int context_id, const char* fmt, ...)
     }
     
     int size = 0;
-    if (!generate_header(true, tag, context_id, "error", &size)) {
+    if (!generate_header(true, tag, context_id, "Error", &size)) {
         return;
     }
     
diff --git a/trunk/src/app/srs_app_reload.cpp b/trunk/src/app/srs_app_reload.cpp
index c91fd9275..82d398bb1 100644
--- a/trunk/src/app/srs_app_reload.cpp
+++ b/trunk/src/app/srs_app_reload.cpp
@@ -145,6 +145,11 @@ int ISrsReloadHandler::on_reload_vhost_forward(string /*vhost*/)
     return ERROR_SUCCESS;
 }
 
+int ISrsReloadHandler::on_reload_vhost_dash(string /*vhost*/)
+{
+    return ERROR_SUCCESS;
+}
+
 int ISrsReloadHandler::on_reload_vhost_hls(string /*vhost*/)
 {
     return ERROR_SUCCESS;
diff --git a/trunk/src/app/srs_app_reload.hpp b/trunk/src/app/srs_app_reload.hpp
index ef512b17f..1fbb30978 100644
--- a/trunk/src/app/srs_app_reload.hpp
+++ b/trunk/src/app/srs_app_reload.hpp
@@ -68,6 +68,7 @@ public:
     virtual int on_reload_vhost_removed(std::string vhost);
     virtual int on_reload_vhost_play(std::string vhost);
     virtual int on_reload_vhost_forward(std::string vhost);
+    virtual int on_reload_vhost_dash(std::string vhost);
     virtual int on_reload_vhost_hls(std::string vhost);
     virtual int on_reload_vhost_hds(std::string vhost);
     virtual int on_reload_vhost_dvr(std::string vhost);
diff --git a/trunk/src/app/srs_app_source.cpp b/trunk/src/app/srs_app_source.cpp
index b33d66237..f0f51597c 100755
--- a/trunk/src/app/srs_app_source.cpp
+++ b/trunk/src/app/srs_app_source.cpp
@@ -47,6 +47,7 @@ using namespace std;
 #include <srs_core_autofree.hpp>
 #include <srs_protocol_utility.hpp>
 #include <srs_app_ng_exec.hpp>
+#include <srs_app_dash.hpp>
 
 #define CONST_MAX_JITTER_MS         250
 #define CONST_MAX_JITTER_MS_NEG         -250
@@ -836,19 +837,20 @@ SrsSharedPtrMessage* SrsMixQueue::pop()
     return msg;
 }
 
-SrsOriginHub::SrsOriginHub(SrsSource* s)
+SrsOriginHub::SrsOriginHub()
 {
-    source = s;
+    source = NULL;
     req = NULL;
     is_active = false;
     
     hls = new SrsHls();
+    dash = new SrsMpegDash();
     dvr = new SrsDvr();
 #ifdef SRS_AUTO_TRANSCODE
     encoder = new SrsEncoder();
 #endif
 #ifdef SRS_AUTO_HDS
-    hds = new SrsHds(s);
+    hds = new SrsHds();
 #endif
     ng_exec = new SrsNgExec();
     
@@ -870,6 +872,7 @@ SrsOriginHub::~SrsOriginHub()
     srs_freep(ng_exec);
     
     srs_freep(hls);
+    srs_freep(dash);
     srs_freep(dvr);
 #ifdef SRS_AUTO_TRANSCODE
     srs_freep(encoder);
@@ -879,16 +882,21 @@ SrsOriginHub::~SrsOriginHub()
 #endif
 }
 
-int SrsOriginHub::initialize(SrsRequest* r)
+int SrsOriginHub::initialize(SrsSource* s, SrsRequest* r)
 {
     int ret = ERROR_SUCCESS;
     
     req = r;
+    source = s;
     
     if ((ret = hls->initialize(this, req)) != ERROR_SUCCESS) {
         return ret;
     }
     
+    if ((ret = dash->initialize(this, req)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
     if ((ret = dvr->initialize(this, req)) != ERROR_SUCCESS) {
         return ret;
     }
@@ -899,6 +907,8 @@ int SrsOriginHub::initialize(SrsRequest* r)
 void SrsOriginHub::dispose()
 {
     hls->dispose();
+    
+    // TODO: Support dispose DASH.
 }
 
 int SrsOriginHub::cycle()
@@ -909,6 +919,8 @@ int SrsOriginHub::cycle()
         return ret;
     }
     
+    // TODO: Support cycle DASH.
+    
     return ret;
 }
 
@@ -967,6 +979,12 @@ int SrsOriginHub::on_audio(SrsSharedPtrMessage* shared_audio)
         }
     }
     
+    if ((ret = dash->on_audio(msg)) != ERROR_SUCCESS) {
+        srs_warn("DASH failed, ignore and disable it. ret=%d", ret);
+        dash->on_unpublish();
+        ret = ERROR_SUCCESS;
+    }
+    
     if ((ret = dvr->on_audio(msg)) != ERROR_SUCCESS) {
         srs_warn("dvr process audio message failed, ignore and disable dvr. ret=%d", ret);
         
@@ -1034,6 +1052,12 @@ int SrsOriginHub::on_video(SrsSharedPtrMessage* shared_video, bool is_sequence_h
         }
     }
     
+    if ((ret = dash->on_video(msg, is_sequence_header)) != ERROR_SUCCESS) {
+        srs_warn("DASH failed, ignore and disable it. ret=%d", ret);
+        dash->on_unpublish();
+        ret = ERROR_SUCCESS;
+    }
+    
     if ((ret = dvr->on_video(msg)) != ERROR_SUCCESS) {
         srs_warn("dvr process video message failed, ignore and disable dvr. ret=%d", ret);
         
@@ -1088,12 +1112,17 @@ int SrsOriginHub::on_publish()
     }
 #endif
     
-    if ((ret = hls->on_publish(false)) != ERROR_SUCCESS) {
+    if ((ret = hls->on_publish()) != ERROR_SUCCESS) {
         srs_error("start hls failed. ret=%d", ret);
         return ret;
     }
     
-    if ((ret = dvr->on_publish(false)) != ERROR_SUCCESS) {
+    if ((ret = dash->on_publish()) != ERROR_SUCCESS) {
+        srs_error("Start DASH failed. ret=%d", ret);
+        return ret;
+    }
+    
+    if ((ret = dvr->on_publish()) != ERROR_SUCCESS) {
         srs_error("start dvr failed. ret=%d", ret);
         return ret;
     }
@@ -1129,6 +1158,7 @@ void SrsOriginHub::on_unpublish()
 #endif
     
     hls->on_unpublish();
+    dash->on_unpublish();
     dvr->on_unpublish();
     
 #ifdef SRS_AUTO_HDS
@@ -1164,29 +1194,6 @@ int SrsOriginHub::on_forwarder_start(SrsForwarder* forwarder)
     return ret;
 }
 
-int SrsOriginHub::on_hls_start()
-{
-    int ret = ERROR_SUCCESS;
-    
-    SrsSharedPtrMessage* cache_sh_video = source->meta->vsh();
-    SrsSharedPtrMessage* cache_sh_audio = source->meta->ash();
-    
-    // feed the hls the metadata/sequence header,
-    // when reload to start hls, hls will never get the sequence header in stream,
-    // use the SrsSource.on_hls_start to push the sequence header to HLS.
-    // TODO: maybe need to decode the metadata?
-    if (cache_sh_video && (ret = hls->on_video(cache_sh_video, true)) != ERROR_SUCCESS) {
-        srs_error("hls process video sequence header message failed. ret=%d", ret);
-        return ret;
-    }
-    if (cache_sh_audio && (ret = hls->on_audio(cache_sh_audio)) != ERROR_SUCCESS) {
-        srs_error("hls process audio sequence header message failed. ret=%d", ret);
-        return ret;
-    }
-    
-    return ret;
-}
-
 int SrsOriginHub::on_dvr_request_sh()
 {
     int ret = ERROR_SUCCESS;
@@ -1243,6 +1250,40 @@ int SrsOriginHub::on_reload_vhost_forward(string vhost)
     return ret;
 }
 
+int SrsOriginHub::on_reload_vhost_dash(string vhost)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if (req->vhost != vhost) {
+        return ret;
+    }
+    
+    dash->on_unpublish();
+    
+    // Don't start DASH when source is not active.
+    if (!is_active) {
+        return ret;
+    }
+    
+    if ((ret = dash->on_publish()) != ERROR_SUCCESS) {
+        srs_error("DASH start failed, ret=%d", ret);
+        return ret;
+    }
+    
+    SrsSharedPtrMessage* cache_sh_video = source->meta->vsh();
+    SrsSharedPtrMessage* cache_sh_audio = source->meta->ash();
+    if (cache_sh_video && (ret = dash->on_video(cache_sh_video, true)) != ERROR_SUCCESS) {
+        srs_error("DASH consume video failed. ret=%d", ret);
+        return ret;
+    }
+    if (cache_sh_audio && (ret = dash->on_audio(cache_sh_audio)) != ERROR_SUCCESS) {
+        srs_error("DASH consume audio failed. ret=%d", ret);
+        return ret;
+    }
+    
+    return ret;
+}
+
 int SrsOriginHub::on_reload_vhost_hls(string vhost)
 {
     int ret = ERROR_SUCCESS;
@@ -1255,17 +1296,38 @@ int SrsOriginHub::on_reload_vhost_hls(string vhost)
     
     hls->on_unpublish();
     
-    // Don't start forwarders when source is not active.
+    // Don't start HLS when source is not active.
     if (!is_active) {
         return ret;
     }
     
-    if ((ret = hls->on_publish(true)) != ERROR_SUCCESS) {
+    if ((ret = hls->on_publish()) != ERROR_SUCCESS) {
         srs_error("hls publish failed. ret=%d", ret);
         return ret;
     }
     srs_trace("vhost %s hls reload success", vhost.c_str());
     
+    // when publish, don't need to fetch sequence header, which is old and maybe corrupt.
+    // when reload, we must fetch the sequence header from source cache.
+    // notice the source to get the cached sequence header.
+    // when reload to start hls, hls will never get the sequence header in stream,
+    // use the SrsSource.on_hls_start to push the sequence header to HLS.
+    SrsSharedPtrMessage* cache_sh_video = source->meta->vsh();
+    SrsSharedPtrMessage* cache_sh_audio = source->meta->ash();
+    
+    // feed the hls the metadata/sequence header,
+    // when reload to start hls, hls will never get the sequence header in stream,
+    // use the SrsSource.on_hls_start to push the sequence header to HLS.
+    // TODO: maybe need to decode the metadata?
+    if (cache_sh_video && (ret = hls->on_video(cache_sh_video, true)) != ERROR_SUCCESS) {
+        srs_error("hls process video sequence header message failed. ret=%d", ret);
+        return ret;
+    }
+    if (cache_sh_audio && (ret = hls->on_audio(cache_sh_audio)) != ERROR_SUCCESS) {
+        srs_error("hls process audio sequence header message failed. ret=%d", ret);
+        return ret;
+    }
+    
     return ret;
 }
 
@@ -1282,7 +1344,7 @@ int SrsOriginHub::on_reload_vhost_hds(string vhost)
 #ifdef SRS_AUTO_HDS
     hds->on_unpublish();
     
-    // Don't start forwarders when source is not active.
+    // Don't start HDS when source is not active.
     if (!is_active) {
         return ret;
     }
@@ -1310,7 +1372,7 @@ int SrsOriginHub::on_reload_vhost_dvr(string vhost)
     // cleanup dvr
     dvr->on_unpublish();
     
-    // Don't start forwarders when source is not active.
+    // Don't start DVR when source is not active.
     if (!is_active) {
         return ret;
     }
@@ -1321,11 +1383,15 @@ int SrsOriginHub::on_reload_vhost_dvr(string vhost)
     }
     
     // start to publish by new plan.
-    if ((ret = dvr->on_publish(true)) != ERROR_SUCCESS) {
+    if ((ret = dvr->on_publish()) != ERROR_SUCCESS) {
         srs_error("dvr publish failed. ret=%d", ret);
         return ret;
     }
     
+    if ((ret = on_dvr_request_sh()) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
     srs_trace("vhost %s dvr reload success", vhost.c_str());
     
     return ret;
@@ -1344,7 +1410,7 @@ int SrsOriginHub::on_reload_vhost_transcode(string vhost)
 #ifdef SRS_AUTO_TRANSCODE
     encoder->on_unpublish();
     
-    // Don't start forwarders when source is not active.
+    // Don't start transcode when source is not active.
     if (!is_active) {
         return ret;
     }
@@ -1371,7 +1437,7 @@ int SrsOriginHub::on_reload_vhost_exec(string vhost)
     
     ng_exec->on_unpublish();
     
-    // Don't start forwarders when source is not active.
+    // Don't start exec when source is not active.
     if (!is_active) {
         return ret;
     }
@@ -1712,7 +1778,7 @@ SrsSource::SrsSource()
     publish_edge = new SrsPublishEdge();
     gop_cache = new SrsGopCache();
     aggregate_stream = new SrsBuffer();
-    hub = new SrsOriginHub(this);
+    hub = new SrsOriginHub();
     meta = new SrsMetaCache();
     
     is_monotonically_increase = false;
@@ -1790,7 +1856,7 @@ int SrsSource::initialize(SrsRequest* r, ISrsSourceHandler* h)
     req = r->copy();
     atc = _srs_config->get_atc(req->vhost);
     
-    if ((ret = hub->initialize(req)) != ERROR_SUCCESS) {
+    if ((ret = hub->initialize(this, req)) != ERROR_SUCCESS) {
         return ret;
     }
 
diff --git a/trunk/src/app/srs_app_source.hpp b/trunk/src/app/srs_app_source.hpp
index 573b8e8fa..9ef381db5 100644
--- a/trunk/src/app/srs_app_source.hpp
+++ b/trunk/src/app/srs_app_source.hpp
@@ -56,6 +56,7 @@ class SrsConnection;
 class SrsMessageHeader;
 class SrsHls;
 class SrsDvr;
+class SrsMpegDash;
 #ifdef SRS_AUTO_TRANSCODE
 class SrsEncoder;
 #endif
@@ -422,6 +423,8 @@ private:
 private:
     // hls handler.
     SrsHls* hls;
+    // The DASH encoder.
+    SrsMpegDash* dash;
     // dvr handler.
     SrsDvr* dvr;
     // transcoding handler.
@@ -437,12 +440,12 @@ private:
     // to forward stream to other servers
     std::vector<SrsForwarder*> forwarders;
 public:
-    SrsOriginHub(SrsSource* s);
+    SrsOriginHub();
     virtual ~SrsOriginHub();
 public:
     // Initialize the hub with source and request.
     // @param r The request object, managed by source.
-    virtual int initialize(SrsRequest* r);
+    virtual int initialize(SrsSource* s, SrsRequest* r);
     // Dispose the hub, release utilities resource,
     // for example, delete all HLS pieces.
     virtual void dispose();
@@ -461,17 +464,16 @@ public:
     virtual int on_publish();
     // When stop publish stream.
     virtual void on_unpublish();
-// for the tools callback
+// Internal callback.
 public:
     // for the SrsForwarder to callback to request the sequence headers.
     virtual int on_forwarder_start(SrsForwarder* forwarder);
-    // for the SrsHls to callback to request the sequence headers.
-    virtual int on_hls_start();
     // for the SrsDvr to callback to request the sequence headers.
     virtual int on_dvr_request_sh();
 // interface ISrsReloadHandler
 public:
     virtual int on_reload_vhost_forward(std::string vhost);
+    virtual int on_reload_vhost_dash(std::string vhost);
     virtual int on_reload_vhost_hls(std::string vhost);
     virtual int on_reload_vhost_hds(std::string vhost);
     virtual int on_reload_vhost_dvr(std::string vhost);
diff --git a/trunk/src/main/srs_main_server.cpp b/trunk/src/main/srs_main_server.cpp
index e80ad91aa..d2702ecbe 100644
--- a/trunk/src/main/srs_main_server.cpp
+++ b/trunk/src/main/srs_main_server.cpp
@@ -164,7 +164,10 @@ int main(int argc, char** argv)
         }
 #endif
         
-        srs_trace(ss.str().c_str());
+        string sss = ss.str();
+        if (!sss.empty()) {
+            srs_trace(sss.c_str());
+        }
     }
     
     // we check the config when the log initialized.
@@ -202,6 +205,7 @@ void show_macro_features()
         
         // rch(rtmp complex handshake)
         ss << ", rch:" << srs_bool2switch(SRS_AUTO_SSL_BOOL);
+        ss << ", dash:" << "on";
         ss << ", hls:" << srs_bool2switch(SRS_AUTO_HLS_BOOL);
         ss << ", hds:" << srs_bool2switch(SRS_AUTO_HDS_BOOL);
         // hc(http callback)