diff --git a/trunk/src/app/srs_app_hls.cpp b/trunk/src/app/srs_app_hls.cpp
index dd225b991..d7738d812 100644
--- a/trunk/src/app/srs_app_hls.cpp
+++ b/trunk/src/app/srs_app_hls.cpp
@@ -74,7 +74,7 @@ using namespace std;
 // in ms, for HLS aac sync time.
 #define SRS_CONF_DEFAULT_AAC_SYNC 100
 // in ms, for HLS aac flush the audio
-#define SRS_CONF_DEFAULT_AAC_DELAY 300
+#define SRS_CONF_DEFAULT_AAC_DELAY 100
 
 // @see: ngx_rtmp_mpegts_header
 u_int8_t mpegts_header[] = {
@@ -1266,13 +1266,13 @@ int SrsHlsCache::cache_video(SrsAvcAacCodec* codec, SrsCodecSample* sample)
             if (nal_unit_type == 1 || nal_unit_type == 5 || nal_unit_type == 6) {
                 // for type 6, append a aud with type 9.
                 vb->append(aud_nal, sizeof(aud_nal));
+                aud_sent = true;
             }
         }
         
         // 5: Coded slice of an IDR picture.
         // insert sps/pps before IDR or key frame is ok.
         if (nal_unit_type == 5 && !sps_pps_sent) {
-        //if (vf->key && !sps_pps_sent) {
             sps_pps_sent = true;
             
             // @see: ngx_rtmp_hls_append_sps_pps
diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index 49c0ee32b..0b7b51846 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 "0"
 #define VERSION_MINOR "9"
-#define VERSION_REVISION "152"
+#define VERSION_REVISION "153"
 #define RTMP_SIG_SRS_VERSION VERSION_MAJOR"."VERSION_MINOR"."VERSION_REVISION
 // server info.
 #define RTMP_SIG_SRS_KEY "SRS"