diff --git a/README.md b/README.md
index a467b26d4..d60c442e5 100755
--- a/README.md
+++ b/README.md
@@ -186,6 +186,7 @@ Please select your language:
 
 ### V3 changes
 
+* v3.0, 2017-02-12, Fix [#301][bug #301], User must config the codec in right way for HLS. 3.0.18
 * v3.0, 2017-02-07, fix [#738][bug #738] support DVR general mp4. 3.0.17
 * v3.0, 2017-01-19, for [#742][bug #742] refine source, meta and origin hub. 3.0.16
 * v3.0, 2017-01-17, for [#742][bug #742] refine source, timeout, live cycle. 3.0.15
@@ -1219,8 +1220,6 @@ Winlin
 [bug #310]: https://github.com/ossrs/srs/issues/310
 [bug #136]: https://github.com/ossrs/srs/issues/136
 [bug #250]: https://github.com/ossrs/srs/issues/250
-[bug #301]: https://github.com/ossrs/srs/issues/301
-[bug #301]: https://github.com/ossrs/srs/issues/301
 [bug #268]: https://github.com/ossrs/srs/issues/268
 [bug #151]: https://github.com/ossrs/srs/issues/151
 [bug #151]: https://github.com/ossrs/srs/issues/151
diff --git a/trunk/src/app/srs_app_hls.cpp b/trunk/src/app/srs_app_hls.cpp
index d05c78057..8dc1b160a 100644
--- a/trunk/src/app/srs_app_hls.cpp
+++ b/trunk/src/app/srs_app_hls.cpp
@@ -223,7 +223,6 @@ SrsHlsMuxer::SrsHlsMuxer()
     max_td = 0;
     _sequence_no = 0;
     current = NULL;
-    acodec = SrsAudioCodecIdReserved1;
     async = new SrsAsyncCallWorker();
     context = new SrsTsContext();
 }
@@ -478,14 +477,7 @@ int SrsHlsMuxer::segment_open(int64_t segment_start_dts)
         srs_error("open hls muxer failed. ret=%d", ret);
         return ret;
     }
-    srs_info("open HLS muxer success. path=%s, tmp=%s",
-        current->full_path.c_str(), tmp_file.c_str());
-
-    // set the segment muxer audio codec.
-    // TODO: FIXME: refine code, use event instead.
-    if (acodec != SrsAudioCodecIdReserved1) {
-        current->muxer->update_acodec(acodec);
-    }
+    srs_info("open HLS muxer success. path=%s, tmp=%s", current->full_path.c_str(), tmp_file.c_str());
     
     return ret;
 }
@@ -543,14 +535,6 @@ bool SrsHlsMuxer::is_segment_absolutely_overflow()
     return current->duration >= hls_aof_ratio * hls_fragment + deviation;
 }
 
-int SrsHlsMuxer::update_acodec(SrsAudioCodecId ac)
-{
-    srs_assert(current);
-    srs_assert(current->muxer);
-    acodec = ac;
-    return current->muxer->update_acodec(ac);
-}
-
 bool SrsHlsMuxer::pure_audio()
 {
     return current && current->muxer && current->muxer->video_codec() == SrsVideoCodecIdDisabled;
@@ -863,11 +847,6 @@ void SrsHlsController::dispose()
     muxer->dispose();
 }
 
-int SrsHlsController::update_acodec(SrsAudioCodecId ac)
-{
-    return muxer->update_acodec(ac);
-}
-
 int SrsHlsController::sequence_no()
 {
     return muxer->sequence_no();
@@ -1220,12 +1199,6 @@ int SrsHls::on_audio(SrsSharedPtrMessage* shared_audio, SrsFormat* format)
     if (acodec != SrsAudioCodecIdAAC && acodec != SrsAudioCodecIdMP3) {
         return ret;
     }
-
-    // when codec changed, write new header.
-    if ((ret = controller->update_acodec(acodec)) != ERROR_SUCCESS) {
-        srs_error("http: ts audio write header failed. ret=%d", ret);
-        return ret;
-    }
     
     // ignore sequence header
     srs_assert(format->audio);
diff --git a/trunk/src/app/srs_app_hls.hpp b/trunk/src/app/srs_app_hls.hpp
index 8bc83d93b..b0adcf86a 100644
--- a/trunk/src/app/srs_app_hls.hpp
+++ b/trunk/src/app/srs_app_hls.hpp
@@ -174,12 +174,6 @@ private:
     * current writing segment.
     */
     SrsHlsSegment* current;
-    /**
-    * the current audio codec, when open new muxer,
-    * set the muxer audio codec.
-    * @see https://github.com/ossrs/srs/issues/301
-    */
-    SrsAudioCodecId acodec;
     /**
      * the ts context, to keep cc continous between ts.
      * @see https://github.com/ossrs/srs/issues/375
@@ -230,7 +224,6 @@ public:
     */
     virtual bool is_segment_absolutely_overflow();
 public:
-    virtual int update_acodec(SrsAudioCodecId ac);
     /**
      * whether current hls muxer is pure audio mode.
      */
@@ -278,7 +271,6 @@ public:
 public:
     virtual int initialize();
     virtual void dispose();
-    virtual int update_acodec(SrsAudioCodecId ac);
     virtual int sequence_no();
     virtual std::string ts_url();
     virtual double duration();
diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index 7831f0769..af5bf4d93 100644
--- a/trunk/src/core/srs_core.hpp
+++ b/trunk/src/core/srs_core.hpp
@@ -31,7 +31,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // current release version
 #define VERSION_MAJOR       3
 #define VERSION_MINOR       0
-#define VERSION_REVISION    17
+#define VERSION_REVISION    18
 
 // generated by configure, only macros.
 #include <srs_auto_headers.hpp>
diff --git a/trunk/src/kernel/srs_kernel_ts.cpp b/trunk/src/kernel/srs_kernel_ts.cpp
index 37bef5d8c..d13c88148 100644
--- a/trunk/src/kernel/srs_kernel_ts.cpp
+++ b/trunk/src/kernel/srs_kernel_ts.cpp
@@ -2740,12 +2740,6 @@ int SrsTsMuxer::open(string p)
     return ret;
 }
 
-int SrsTsMuxer::update_acodec(SrsAudioCodecId ac)
-{
-    acodec = ac;
-    return ERROR_SUCCESS;
-}
-
 int SrsTsMuxer::write_audio(SrsTsMessage* audio)
 {
     int ret = ERROR_SUCCESS;
@@ -3117,6 +3111,7 @@ int SrsTsEncoder::initialize(SrsFileWriter* fw)
     writer = fw;
 
     srs_freep(muxer);
+    // TODO: FIXME: Support config the codec.
     muxer = new SrsTsMuxer(fw, context, SrsAudioCodecIdAAC, SrsVideoCodecIdAVC);
 
     if ((ret = muxer->open("")) != ERROR_SUCCESS) {
@@ -3139,12 +3134,6 @@ int SrsTsEncoder::write_audio(int64_t timestamp, char* data, int size)
     if (format->acodec->id != SrsAudioCodecIdAAC && format->acodec->id != SrsAudioCodecIdMP3) {
         return ret;
     }
-
-    // when codec changed, write new header.
-    if ((ret = muxer->update_acodec(format->acodec->id)) != ERROR_SUCCESS) {
-        srs_error("http: ts audio write header failed. ret=%d", ret);
-        return ret;
-    }
     
     // for aac: ignore sequence header
     if (format->acodec->id == SrsAudioCodecIdAAC && format->audio->aac_packet_type == SrsAudioAacFrameTraitSequenceHeader) {
diff --git a/trunk/src/kernel/srs_kernel_ts.hpp b/trunk/src/kernel/srs_kernel_ts.hpp
index 004465b3d..7fcfc91d9 100644
--- a/trunk/src/kernel/srs_kernel_ts.hpp
+++ b/trunk/src/kernel/srs_kernel_ts.hpp
@@ -1562,6 +1562,8 @@ protected:
 class SrsTsMuxer
 {
 private:
+    // User must config the codec in right way.
+    // @see https://github.com/ossrs/srs/issues/301
     SrsVideoCodecId vcodec;
     SrsAudioCodecId acodec;
 private:
@@ -1578,15 +1580,6 @@ public:
      */
     virtual int open(std::string p);
     /**
-    * when open ts, we donot write the header(PSI),
-    * for user may need to update the acodec to mp3 or others,
-    * so we use delay write PSI, when write audio or video.
-    * @remark for audio aac codec, for example, SRS1, it's ok to write PSI when open ts.
-    * @see https://github.com/ossrs/srs/issues/301
-    */
-    // TODO: FIXME: Remove it.
-    virtual int update_acodec(SrsAudioCodecId ac);
-    /**
     * write an audio frame to ts, 
     */
     virtual int write_audio(SrsTsMessage* audio);