diff --git a/README.md b/README.md
index 00f63b7c7..000332310 100755
--- a/README.md
+++ b/README.md
@@ -344,6 +344,7 @@ Remark:
 
 ### SRS 2.0 history
 
+* v2.0, 2015-07-01, fix [#433](https://github.com/simple-rtmp-server/srs/issues/433) fix the sps parse bug. 2.0.176
 * v2.0, 2015-06-10, fix [#425](https://github.com/simple-rtmp-server/srs/issues/425) refine the time jitter, correct (-inf,-250)+(250,+inf) to 10ms. 2.0.175
 * v2.0, 2015-06-10, fix [#424](https://github.com/simple-rtmp-server/srs/issues/424) fix aggregate timestamp bug. 2.0.174
 * v2.0, 2015-06-06, fix [#421](https://github.com/simple-rtmp-server/srs/issues/421) drop video for unkown RTMP header.
diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index f8fbee7ef..edfbf462a 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       2
 #define VERSION_MINOR       0
-#define VERSION_REVISION    175
+#define VERSION_REVISION    176
 
 // server info.
 #define RTMP_SIG_SRS_KEY "SRS"
diff --git a/trunk/src/kernel/srs_kernel_codec.cpp b/trunk/src/kernel/srs_kernel_codec.cpp
index 0436c25fa..a1ebf4a13 100644
--- a/trunk/src/kernel/srs_kernel_codec.cpp
+++ b/trunk/src/kernel/srs_kernel_codec.cpp
@@ -981,11 +981,11 @@ int SrsAvcAacCodec::avc_demux_sps_rbsp(char* rbsp, int nb_rbsp)
     }
     srs_info("sps parse profile=%d, level=%d, sps_id=%d", profile_idc, level_idc, seq_parameter_set_id);
     
+    int32_t chroma_format_idc = -1;
     if (profile_idc == 100 || profile_idc == 110 || profile_idc == 122 || profile_idc == 244
         || profile_idc == 44 || profile_idc == 83 || profile_idc == 86 || profile_idc == 118
         || profile_idc == 128
     ) {
-        int32_t chroma_format_idc = -1;
         if ((ret = srs_avc_nalu_read_uev(&bs, chroma_format_idc)) != ERROR_SUCCESS) {
             return ret;
         }
@@ -1016,9 +1016,18 @@ int SrsAvcAacCodec::avc_demux_sps_rbsp(char* rbsp, int nb_rbsp)
             return ret;
         }
         if (seq_scaling_matrix_present_flag) {
-            ret = ERROR_HLS_DECODE_ERROR;
-            srs_error("sps the seq_scaling_matrix_present_flag invalid. ret=%d", ret);
-            return ret;
+            int nb_scmpfs = ((chroma_format_idc != 3)? 8:12);
+            for (int i = 0; i < nb_scmpfs; i++) {
+                int8_t seq_scaling_matrix_present_flag_i = -1;
+                if ((ret = srs_avc_nalu_read_bit(&bs, seq_scaling_matrix_present_flag_i)) != ERROR_SUCCESS) {
+                    return ret;
+                }
+                if (seq_scaling_matrix_present_flag_i) {
+                    ret = ERROR_HLS_DECODE_ERROR;
+                    srs_error("sps the seq_scaling_matrix_present_flag invalid, i=%d, nb_scmpfs=%d. ret=%d", i, nb_scmpfs, ret);
+                    return ret;
+                }
+            }
         }
     }