diff --git a/trunk/src/app/srs_app_dash.cpp b/trunk/src/app/srs_app_dash.cpp
index 4f0552130..e9bc70c6f 100644
--- a/trunk/src/app/srs_app_dash.cpp
+++ b/trunk/src/app/srs_app_dash.cpp
@@ -51,9 +51,9 @@ int SrsInitMp4::write(SrsFormat* format, bool video, int tid)
 {
     int ret = ERROR_SUCCESS;
     
-    string path_tmp = fullpath() + ".tmp";
+    string path_tmp = tmppath();
     if ((ret = fw->open(path_tmp)) != ERROR_SUCCESS) {
-        srs_error("DASH: Open media failed, path=%s, ret=%d", path_tmp.c_str(), ret);
+        srs_error("DASH: Open init mp4 failed, path=%s, ret=%d", path_tmp.c_str(), ret);
         return ret;
     }
     
@@ -291,10 +291,56 @@ int SrsInitMp4::write(SrsFormat* format, bool video, int tid)
 
 SrsFragmentedMp4::SrsFragmentedMp4()
 {
+    fw = new SrsFileWriter();
 }
 
 SrsFragmentedMp4::~SrsFragmentedMp4()
 {
+    srs_freep(fw);
+}
+
+int SrsFragmentedMp4::initialize(bool video, SrsMpdWriter* mpd)
+{
+    int ret = ERROR_SUCCESS;
+    
+    string home;
+    string path;
+    
+    if ((ret = mpd->get_fragment(video, home, path)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    set_path(home + "/" + path);
+    
+    if ((ret = create_dir()) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    string path_tmp = tmppath();
+    if ((ret = fw->open(path_tmp)) != ERROR_SUCCESS) {
+        srs_error("DASH: Open fmp4 failed, path=%s, ret=%d", path_tmp.c_str(), ret);
+        return ret;
+    }
+    
+    return ret;
+}
+
+int SrsFragmentedMp4::write(SrsSharedPtrMessage* shared_msg, SrsFormat* format)
+{
+    int ret = ERROR_SUCCESS;
+    return ret;
+}
+
+int SrsFragmentedMp4::reap()
+{
+    int ret = ERROR_SUCCESS;
+    
+    srs_freep(fw);
+    
+    if ((ret = rename()) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    return ret;
 }
 
 SrsMpdWriter::SrsMpdWriter()
@@ -336,6 +382,8 @@ int SrsMpdWriter::write(SrsFormat* format)
     string full_path = home + "/" + mpd_path;
     string full_home = srs_path_dirname(full_path);
     
+    fragment_home = srs_path_dirname(mpd_path) + "/" + req->stream;
+    
     if ((ret = srs_create_dir_recursively(full_home)) != ERROR_SUCCESS) {
         srs_error("DASH: Create MPD home failed, home=%s, ret=%d", full_home.c_str(), ret);
         return ret;
@@ -399,19 +447,40 @@ int SrsMpdWriter::write(SrsFormat* format)
     return ret;
 }
 
+int SrsMpdWriter::get_fragment(bool video, std::string& home, std::string& path)
+{
+    int ret = ERROR_SUCCESS;
+    
+    home = fragment_home;
+    
+    int64_t sequence_number = srs_update_system_time_ms() / fragment / 1000;
+    if (video) {
+        path = "video-" + srs_int2str(sequence_number) + ".m4s";
+    } else {
+        path = "audio-" + srs_int2str(sequence_number) + ".m4s";
+    }
+    
+    return ret;
+}
+
 SrsDashController::SrsDashController()
 {
     req = NULL;
     video_tack_id = 2;
     audio_track_id = 1;
     mpd = new SrsMpdWriter();
-    fragments = new SrsFragmentWindow();
+    vcurrent = acurrent = NULL;
+    vfragments = new SrsFragmentWindow();
+    afragments = new SrsFragmentWindow();
 }
 
 SrsDashController::~SrsDashController()
 {
     srs_freep(mpd);
-    srs_freep(fragments);
+    srs_freep(vcurrent);
+    srs_freep(acurrent);
+    srs_freep(vfragments);
+    srs_freep(afragments);
 }
 
 int SrsDashController::initialize(SrsRequest* r)
@@ -419,12 +488,29 @@ int SrsDashController::initialize(SrsRequest* r)
     int ret = ERROR_SUCCESS;
     
     req = r;
+    fragment = _srs_config->get_dash_fragment(r->vhost);
     home = _srs_config->get_dash_path(r->vhost);
     
     if ((ret = mpd->initialize(r)) != ERROR_SUCCESS) {
         return ret;
     }
     
+    string home, path;
+    
+    srs_freep(vcurrent);
+    vcurrent = new SrsFragmentedMp4();
+    if ((ret = vcurrent->initialize(true, mpd)) != ERROR_SUCCESS) {
+        srs_error("DASH: Initialize the video fragment failed, ret=%d", ret);
+        return ret;
+    }
+    
+    srs_freep(acurrent);
+    acurrent = new SrsFragmentedMp4();
+    if ((ret = acurrent->initialize(false, mpd)) != ERROR_SUCCESS) {
+        srs_error("DASH: Initialize the audio fragment failed, ret=%d", ret);
+        return ret;
+    }
+    
     return ret;
 }
 
@@ -436,6 +522,25 @@ int SrsDashController::on_audio(SrsSharedPtrMessage* shared_audio, SrsFormat* fo
         return refresh_init_mp4(shared_audio, format);
     }
     
+    if (acurrent->duration() >= fragment) {
+        if ((ret = acurrent->reap()) != ERROR_SUCCESS) {
+            return ret;
+        }
+        
+        afragments->append(acurrent);
+        acurrent = new SrsFragmentedMp4();
+        
+        if ((ret = acurrent->initialize(false, mpd)) != ERROR_SUCCESS) {
+            srs_error("DASH: Initialize the audio fragment failed, ret=%d", ret);
+            return ret;
+        }
+    }
+    
+    if ((ret = acurrent->write(shared_audio, format)) != ERROR_SUCCESS) {
+        srs_error("DASH: Write audio to fragment failed, ret=%d", ret);
+        return ret;
+    }
+    
     if ((ret = refresh_mpd(format)) != ERROR_SUCCESS) {
         srs_error("DASH: Refresh the MPD failed. ret=%d", ret);
         return ret;
@@ -452,6 +557,27 @@ int SrsDashController::on_video(SrsSharedPtrMessage* shared_video, SrsFormat* fo
         return refresh_init_mp4(shared_video, format);
     }
     
+    bool reopen = format->video->frame_type == SrsVideoAvcFrameTypeKeyFrame
+        && vcurrent->duration() >= fragment;
+    if (reopen) {
+        if ((ret = vcurrent->reap()) != ERROR_SUCCESS) {
+            return ret;
+        }
+        
+        vfragments->append(vcurrent);
+        vcurrent = new SrsFragmentedMp4();
+        
+        if ((ret = vcurrent->initialize(true, mpd)) != ERROR_SUCCESS) {
+            srs_error("DASH: Initialize the video fragment failed, ret=%d", ret);
+            return ret;
+        }
+    }
+    
+    if ((ret = vcurrent->write(shared_video, format)) != ERROR_SUCCESS) {
+        srs_error("DASH: Write video to fragment failed, ret=%d", ret);
+        return ret;
+    }
+    
     if ((ret = refresh_mpd(format)) != ERROR_SUCCESS) {
         srs_error("DASH: Refresh the MPD failed. ret=%d", ret);
         return ret;
diff --git a/trunk/src/app/srs_app_dash.hpp b/trunk/src/app/srs_app_dash.hpp
index 46ab9d4c7..9c8c7785a 100644
--- a/trunk/src/app/srs_app_dash.hpp
+++ b/trunk/src/app/srs_app_dash.hpp
@@ -39,6 +39,7 @@ class SrsOriginHub;
 class SrsSharedPtrMessage;
 class SrsFormat;
 class SrsFileWriter;
+class SrsMpdWriter;
 
 /**
  * The init mp4 for FMP4.
@@ -60,9 +61,18 @@ public:
  */
 class SrsFragmentedMp4 : public SrsFragment
 {
+private:
+    SrsFileWriter* fw;
 public:
     SrsFragmentedMp4();
     virtual ~SrsFragmentedMp4();
+public:
+    // Initialize the fragment, create the home dir, open the file.
+    virtual int initialize(bool video, SrsMpdWriter* mpd);
+    // Write media message to fragment.
+    virtual int write(SrsSharedPtrMessage* shared_msg, SrsFormat* format);
+    // Reap the fragment, close the fd and rename tmp to official file.
+    virtual int reap();
 };
 
 /**
@@ -84,6 +94,9 @@ private:
     std::string home;
     // The MPD path template, from which to build the file path.
     std::string mpd_file;
+private:
+    // The home for fragment, relative to home.
+    std::string fragment_home;
 public:
     SrsMpdWriter();
     virtual ~SrsMpdWriter();
@@ -91,6 +104,9 @@ public:
     virtual int initialize(SrsRequest* r);
     // Write MPD according to parsed format of stream.
     virtual int write(SrsFormat* format);
+public:
+    // Get the fragment home and path.
+    virtual int get_fragment(bool video, std::string& home, std::string& path);
 };
 
 /**
@@ -101,7 +117,14 @@ class SrsDashController
 private:
     SrsRequest* req;
     SrsMpdWriter* mpd;
-    SrsFragmentWindow* fragments;
+private:
+    SrsFragmentedMp4* vcurrent;
+    SrsFragmentWindow* vfragments;
+    SrsFragmentedMp4* acurrent;
+    SrsFragmentWindow* afragments;
+private:
+    // The fragment duration in ms to reap it.
+    int fragment;
 private:
     std::string home;
     int video_tack_id;