diff --git a/README.md b/README.md
index 509f6d416..5edaaf6d5 100755
--- a/README.md
+++ b/README.md
@@ -244,6 +244,7 @@ Supported operating systems and hardware:
 * 2013-10-17, Created.<br/>
 
 ## History
+* v2.0, 2014-11-15, fix [#204](https://github.com/winlinvip/simple-rtmp-server/issues/204), srs-librtmp drop dupliated sps/pps(sequence header). 2.0.22.
 * v2.0, 2014-11-15, fix [#203](https://github.com/winlinvip/simple-rtmp-server/issues/203), srs-librtmp drop any video before sps/pps(sequence header). 2.0.21.
 * v2.0, 2014-11-15, fix [#202](https://github.com/winlinvip/simple-rtmp-server/issues/202), fix memory leak of h.264 raw packet send in srs-librtmp. 2.0.20.
 * v2.0, 2014-11-13, fix [#200](https://github.com/winlinvip/simple-rtmp-server/issues/200), deadloop when read/write 0 and ETIME. 2.0.16.
diff --git a/trunk/research/librtmp/srs_h264_raw_publish.c b/trunk/research/librtmp/srs_h264_raw_publish.c
index 0cbbe76d1..da8b9a483 100644
--- a/trunk/research/librtmp/srs_h264_raw_publish.c
+++ b/trunk/research/librtmp/srs_h264_raw_publish.c
@@ -170,6 +170,10 @@ int main(int argc, char** argv)
         if (error != 0) {
             if (srs_h264_is_dvbsp_error(error)) {
                 srs_lib_trace("ignore drop video error, code=%d", error);
+            } else if (srs_h264_is_duplicated_sps_error(error)) {
+                srs_lib_trace("ignore duplicated sps, code=%d", error);
+            } else if (srs_h264_is_duplicated_pps_error(error)) {
+                srs_lib_trace("ignore duplicated pps, code=%d", error);
             } else {
                 srs_lib_trace("send h264 raw data failed.");
                 goto rtmp_destroy;
diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index 32e907eb0..e9c377957 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    21
+#define VERSION_REVISION    22
 // server info.
 #define RTMP_SIG_SRS_KEY "SRS"
 #define RTMP_SIG_SRS_ROLE "origin/edge server"
diff --git a/trunk/src/kernel/srs_kernel_error.hpp b/trunk/src/kernel/srs_kernel_error.hpp
index ac51890b6..f76f8129a 100644
--- a/trunk/src/kernel/srs_kernel_error.hpp
+++ b/trunk/src/kernel/srs_kernel_error.hpp
@@ -187,6 +187,8 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define ERROR_H264_API_NO_PREFIXED          3041
 #define ERROR_FLV_INVALID_VIDEO_TAG         3042
 #define ERROR_H264_DROP_BEFORE_SPS_PPS      3043
+#define ERROR_H264_DUPLICATED_SPS           3044
+#define ERROR_H264_DUPLICATED_PPS           3045
 
 /**
 * whether the error code is an system control error.
diff --git a/trunk/src/libs/srs_librtmp.cpp b/trunk/src/libs/srs_librtmp.cpp
index 0fb7afc2e..e2d3f80da 100644
--- a/trunk/src/libs/srs_librtmp.cpp
+++ b/trunk/src/libs/srs_librtmp.cpp
@@ -79,12 +79,18 @@ struct Context
     // whether the sps and pps sent,
     // @see https://github.com/winlinvip/simple-rtmp-server/issues/203
     bool h264_sps_pps_sent;
+    // only send the ssp and pps when both changed.
+    // @see https://github.com/winlinvip/simple-rtmp-server/issues/204
+    bool h264_sps_changed;
+    bool h264_pps_changed;
     
     Context() {
         rtmp = NULL;
         skt = NULL;
         stream_id = 0;
         h264_sps_pps_sent = false;
+        h264_sps_changed = false;
+        h264_pps_changed = false;
     }
     virtual ~Context() {
         srs_freep(rtmp);
@@ -1127,8 +1133,8 @@ int __srs_write_h264_sps_pps(Context* context, u_int32_t dts, u_int32_t pts)
 {
     int ret = ERROR_SUCCESS;
     
-    // when pps or sps not ready, ignore.
-    if (context->h264_pps.empty() || context->h264_sps.empty()) {
+    // only send when both sps and pps changed.
+    if (!context->h264_sps_changed || !context->h264_pps_changed) {
         return ret;
     }
     
@@ -1207,8 +1213,8 @@ int __srs_write_h264_sps_pps(Context* context, u_int32_t dts, u_int32_t pts)
     }
     
     // reset sps and pps.
-    context->h264_pps = "";
-    context->h264_sps = "";
+    context->h264_sps_changed = false;
+    context->h264_pps_changed = false;
     context->h264_sps_pps_sent = true;
     
     // TODO: FIXME: for more profile.
@@ -1307,13 +1313,26 @@ int __srs_write_h264_raw_frame(Context* context,
             return ret;
         }
         
-        context->h264_sps = "";
-        context->h264_sps.append(frame, frame_size);
+        std::string sps;
+        sps.append(frame, frame_size);
+        
+        if (context->h264_sps == sps) {
+            return ERROR_H264_DUPLICATED_SPS;
+        }
+        context->h264_sps_changed = true;
+        context->h264_sps = sps;
         
         return __srs_write_h264_sps_pps(context, dts, pts);
     } else if (nal_unit_type == 8) {
-        context->h264_pps = "";
-        context->h264_pps.append(frame, frame_size);
+        
+        std::string pps;
+        pps.append(frame, frame_size);
+        
+        if (context->h264_pps == pps) {
+            return ERROR_H264_DUPLICATED_PPS;
+        }
+        context->h264_pps_changed = true;
+        context->h264_pps = pps;
         
         return __srs_write_h264_sps_pps(context, dts, pts);
     } else {
@@ -1341,6 +1360,11 @@ int srs_h264_write_raw_frames(srs_rtmp_t rtmp,
         return ret;
     }
     
+    // use the last error
+    // @see https://github.com/winlinvip/simple-rtmp-server/issues/203
+    // @see https://github.com/winlinvip/simple-rtmp-server/issues/204
+    int error_code_return = ret;
+    
     // send each frame.
     while (!context->h264_raw_stream.empty()) {
         // each frame must prefixed by annexb format.
@@ -1363,12 +1387,24 @@ int srs_h264_write_raw_frames(srs_rtmp_t rtmp,
         
         // send out the frame.
         char* frame = context->h264_raw_stream.data() + start;
+
+        // it may be return error, but we must process all packets.
         if ((ret = __srs_write_h264_raw_frame(context, frame, size, dts, pts)) != ERROR_SUCCESS) {
+            error_code_return = ret;
+            
+            // ignore known error, process all packets.
+            if (srs_h264_is_dvbsp_error(ret)
+                || srs_h264_is_duplicated_sps_error(ret)
+                || srs_h264_is_duplicated_pps_error(ret)
+            ) {
+                continue;
+            }
+            
             return ret;
         }
     }
     
-    return ret;
+    return error_code_return;
 }
 
 srs_h264_bool srs_h264_is_dvbsp_error(int error_code)
@@ -1376,6 +1412,16 @@ srs_h264_bool srs_h264_is_dvbsp_error(int error_code)
     return error_code == ERROR_H264_DROP_BEFORE_SPS_PPS;
 }
 
+srs_h264_bool srs_h264_is_duplicated_sps_error(int error_code)
+{
+    return error_code == ERROR_H264_DUPLICATED_SPS;
+}
+
+srs_h264_bool srs_h264_is_duplicated_pps_error(int error_code)
+{
+    return error_code == ERROR_H264_DUPLICATED_PPS;
+}
+
 int srs_h264_startswith_annexb(char* h264_raw_data, int h264_raw_size, int* pnb_start_code)
 {
     SrsStream stream;
diff --git a/trunk/src/libs/srs_librtmp.hpp b/trunk/src/libs/srs_librtmp.hpp
index fdc903fa2..a72c270c1 100644
--- a/trunk/src/libs/srs_librtmp.hpp
+++ b/trunk/src/libs/srs_librtmp.hpp
@@ -445,7 +445,9 @@ typedef int srs_h264_bool;
 * @see https://github.com/winlinvip/simple-rtmp-server/issues/66
 * 
 * @return 0, success; otherswise, failed.
-*       for dvbsp error, check by srs_h264_is_dvbsp_error(error_code).
+*       for dvbsp error, @see srs_h264_is_dvbsp_error().
+*       for duplictated sps error, @see srs_h264_is_duplicated_sps_error().
+*       for duplictated pps error, @see srs_h264_is_duplicated_pps_error().
 */
 /**
 For the example file: 
@@ -491,6 +493,20 @@ extern int srs_h264_write_raw_frames(srs_rtmp_t rtmp,
 */
 extern srs_h264_bool srs_h264_is_dvbsp_error(int error_code);
 /**
+* whether error_code is duplicated sps error.
+* 
+* @see https://github.com/winlinvip/simple-rtmp-server/issues/204
+* @example /trunk/research/librtmp/srs_h264_raw_publish.c
+*/
+extern srs_h264_bool srs_h264_is_duplicated_sps_error(int error_code);
+/**
+* whether error_code is duplicated pps error.
+* 
+* @see https://github.com/winlinvip/simple-rtmp-server/issues/204
+* @example /trunk/research/librtmp/srs_h264_raw_publish.c
+*/
+extern srs_h264_bool srs_h264_is_duplicated_pps_error(int error_code);
+/**
 * whether h264 raw data starts with the annexb,
 * which bytes sequence matches N[00] 00 00 01, where N>=0.
 * @param h264_raw_data the input h264 raw data, a encoded h.264 I/P/B frame data.