diff --git a/codec/decoder/core/inc/au_parser.h b/codec/decoder/core/inc/au_parser.h
index cccf42f2..a1d86e84 100644
--- a/codec/decoder/core/inc/au_parser.h
+++ b/codec/decoder/core/inc/au_parser.h
@@ -92,7 +92,7 @@ int32_t ParseRefBasePicMarking (PBitStringAux pBs, PRefBasePicMarking pRefBasePi
 
 int32_t ParsePrefixNalUnit (PWelsDecoderContext pCtx, PBitStringAux pBs);
 
-bool CheckAccessUnitBoundary (const PWelsDecoderContext pCtx, const PNalUnit kpCurNal, const PNalUnit kpLastNal, const PSps kpSps);
+bool CheckAccessUnitBoundary (PWelsDecoderContext pCtx, const PNalUnit kpCurNal, const PNalUnit kpLastNal, const PSps kpSps);
 bool CheckAccessUnitBoundaryExt (PNalUnitHeaderExt pLastNalHdrExt, PNalUnitHeaderExt pCurNalHeaderExt,
                                  PSliceHeader pLastSliceHeader, PSliceHeader pCurSliceHeader);
 /*!
diff --git a/codec/decoder/core/inc/decoder_context.h b/codec/decoder/core/inc/decoder_context.h
index fe328886..2ca1e490 100644
--- a/codec/decoder/core/inc/decoder_context.h
+++ b/codec/decoder/core/inc/decoder_context.h
@@ -286,6 +286,7 @@ typedef struct TagWelsDecoderContext {
   uint16_t            uiCurIdrPicId;
 #endif
   bool       bNewSeqBegin;
+  bool       bNextNewSeqBegin;
   int        iOverwriteFlags;
   int32_t iErrorConMethod; //
   PPicture pPreviousDecodedPictureInDpb; //pointer to previously decoded picture in DPB for error concealment
diff --git a/codec/decoder/core/src/au_parser.cpp b/codec/decoder/core/src/au_parser.cpp
index 044eb96f..97b44efa 100644
--- a/codec/decoder/core/src/au_parser.cpp
+++ b/codec/decoder/core/src/au_parser.cpp
@@ -392,7 +392,7 @@ bool CheckAccessUnitBoundaryExt (PNalUnitHeaderExt pLastNalHdrExt, PNalUnitHeade
 }
 
 
-bool CheckAccessUnitBoundary (const PWelsDecoderContext pCtx, const PNalUnit kpCurNal, const PNalUnit kpLastNal, const PSps kpSps) {
+bool CheckAccessUnitBoundary (PWelsDecoderContext pCtx, const PNalUnit kpCurNal, const PNalUnit kpLastNal, const PSps kpSps) {
   const PNalUnitHeaderExt kpLastNalHeaderExt = &kpLastNal->sNalHeaderExt;
   const PNalUnitHeaderExt kpCurNalHeaderExt = &kpCurNal->sNalHeaderExt;
   const SSliceHeader* kpLastSliceHeader = &kpLastNal->sNalData.sVclNal.sSliceHeaderExt.sSliceHeader;
@@ -405,6 +405,7 @@ bool CheckAccessUnitBoundary (const PWelsDecoderContext pCtx, const PNalUnit kpC
   if (kpLastSliceHeader->iFrameNum != kpCurSliceHeader->iFrameNum)
     return true;
   if (pCtx->pActiveLayerSps[kpCurNalHeaderExt->uiDependencyId] != NULL && pCtx->pActiveLayerSps[kpCurNalHeaderExt->uiDependencyId] != kpSps) {
+    pCtx->bNextNewSeqBegin = true;
     return true; // the active sps changed, new sequence begins, so the current au is ready
   }
   // Subclause 7.4.1.2.5
diff --git a/codec/decoder/core/src/decoder.cpp b/codec/decoder/core/src/decoder.cpp
index 939be966..f5fa2911 100644
--- a/codec/decoder/core/src/decoder.cpp
+++ b/codec/decoder/core/src/decoder.cpp
@@ -295,6 +295,7 @@ void WelsOpenDecoder (PWelsDecoderContext pCtx) {
 #else
   pCtx->bReferenceLostAtT0Flag	= true;	// should be true to waiting IDR at incoming AU bits following, 6/4/2010
 #endif //LONG_TERM_REF
+  pCtx->bNewSeqBegin = true;
 }
 
 /*!
diff --git a/codec/decoder/core/src/decoder_core.cpp b/codec/decoder/core/src/decoder_core.cpp
index 4a733656..9fa90822 100644
--- a/codec/decoder/core/src/decoder_core.cpp
+++ b/codec/decoder/core/src/decoder_core.cpp
@@ -1534,7 +1534,6 @@ static bool CheckNewSeqBeginAndUpdateActiveLayerSps(PWelsDecoderContext pCtx) {
 static void WriteBackActiveParameters(PWelsDecoderContext pCtx) {
   if (pCtx->iOverwriteFlags & OVERWRITE_PPS) {
     memcpy(&pCtx->sPpsBuffer[pCtx->sPpsBuffer[MAX_PPS_COUNT].iPpsId], &pCtx->sPpsBuffer[MAX_PPS_COUNT], sizeof(SPps));
-    pCtx->bNewSeqBegin = true;
   }
   if (pCtx->iOverwriteFlags & OVERWRITE_SPS) {
     memcpy(&pCtx->sSpsBuffer[pCtx->sSpsBuffer[MAX_SPS_COUNT].iSpsId], &pCtx->sSpsBuffer[MAX_SPS_COUNT], sizeof(SSps));
@@ -1542,6 +1541,7 @@ static void WriteBackActiveParameters(PWelsDecoderContext pCtx) {
   }
   if (pCtx->iOverwriteFlags & OVERWRITE_SUBSETSPS) {
     memcpy(&pCtx->sSubsetSpsBuffer[pCtx->sSubsetSpsBuffer[MAX_SPS_COUNT].sSps.iSpsId], &pCtx->sSubsetSpsBuffer[MAX_SPS_COUNT], sizeof(SSubsetSps));
+    pCtx->bNewSeqBegin = true;
   }
   pCtx->iOverwriteFlags = OVERWRITE_NONE;
 }
@@ -1567,7 +1567,7 @@ int32_t ConstructAccessUnit (PWelsDecoderContext pCtx, uint8_t** ppDst, SBufferI
   pCtx->bAuReadyFlag = false;
   pCtx->bLastHasMmco5 = false;
   bool bTmpNewSeqBegin = CheckNewSeqBeginAndUpdateActiveLayerSps(pCtx);
-  pCtx->bNewSeqBegin = pCtx->bNewSeqBegin && bTmpNewSeqBegin;
+  pCtx->bNewSeqBegin = pCtx->bNewSeqBegin || bTmpNewSeqBegin;
   iErr = WelsDecodeAccessUnitStart (pCtx);
   GetVclNalTemporalId (pCtx);
 
@@ -1599,6 +1599,10 @@ int32_t ConstructAccessUnit (PWelsDecoderContext pCtx, uint8_t** ppDst, SBufferI
   WelsDecodeAccessUnitEnd (pCtx);
   pCtx->bNewSeqBegin = false;
   WriteBackActiveParameters(pCtx);
+  pCtx->bNewSeqBegin = pCtx->bNewSeqBegin || pCtx->bNextNewSeqBegin;
+  pCtx->bNextNewSeqBegin = false; // reset it
+  if (pCtx->bNewSeqBegin)
+    ResetActiveSPSForEachLayer(pCtx);
   if (ERR_NONE != iErr) {
     WelsLog (pCtx, WELS_LOG_INFO, "returned error from decoding:[0x%x]\n", iErr);
     return iErr;