diff --git a/codec/decoder/core/src/decoder_core.cpp b/codec/decoder/core/src/decoder_core.cpp
index 9fa90822..e1cbc2bc 100644
--- a/codec/decoder/core/src/decoder_core.cpp
+++ b/codec/decoder/core/src/decoder_core.cpp
@@ -134,11 +134,13 @@ inline void    HandleReferenceLostL0 (PWelsDecoderContext pCtx, PNalUnit pCurNal
   if (0 == pCurNal->sNalHeaderExt.uiTemporalId) {
     pCtx->bReferenceLostAtT0Flag = true;
   }
+  if (pCtx->iErrorConMethod == ERROR_CON_DISABLE) {
 #ifndef LONG_TERM_REF
-  if (pCtx->bReferenceLostAtT0Flag) {
-    ResetParameterSetsState (pCtx);
-  }
+    if (pCtx->bReferenceLostAtT0Flag) {
+      ResetParameterSetsState (pCtx);
+    }
 #endif
+  }
   pCtx->iErrorCode |= dsBitstreamError;
 }
 
@@ -146,11 +148,13 @@ inline void    HandleReferenceLost (PWelsDecoderContext pCtx, PNalUnit pCurNal)
   if ((0 == pCurNal->sNalHeaderExt.uiTemporalId) || (1 == pCurNal->sNalHeaderExt.uiTemporalId)) {
     pCtx->bReferenceLostAtT0Flag = true;
   }
+  if (pCtx->iErrorConMethod == ERROR_CON_DISABLE) {
 #ifndef LONG_TERM_REF
-  if (pCtx->bReferenceLostAtT0Flag) {
-    ResetParameterSetsState (pCtx);
-  }
+    if (pCtx->bReferenceLostAtT0Flag) {
+      ResetParameterSetsState (pCtx);
+    }
 #endif
+  }
   pCtx->iErrorCode |= dsRefLost;
 }
 
@@ -901,13 +905,15 @@ int32_t UpdateAccessUnit (PWelsDecoderContext pCtx) {
     if (uiActualIdx ==
         pCurAu->uiActualUnitsNum) {	// no found IDR nal within incoming AU, need exit to avoid mosaic issue, 11/19/2009
       WelsLog (pCtx, WELS_LOG_WARNING, "UpdateAccessUnit():::::Key frame lost.....CAN NOT find IDR from current AU.\n");
+      if (pCtx->iErrorCode == ERROR_CON_DISABLE) {
 #ifdef LONG_TERM_REF
-      pCtx->iErrorCode |= dsNoParamSets;
-      return dsNoParamSets;
+        pCtx->iErrorCode |= dsNoParamSets;
+        return dsNoParamSets;
 #else
-      pCtx->iErrorCode |= dsRefLost;
-      return ERR_INFO_REFERENCE_PIC_LOST;
+        pCtx->iErrorCode |= dsRefLost;
+        return ERR_INFO_REFERENCE_PIC_LOST;
 #endif
+      }
     }
   }
 
@@ -1580,9 +1586,8 @@ int32_t ConstructAccessUnit (PWelsDecoderContext pCtx, uint8_t** ppDst, SBufferI
   pCtx->pSps = pCurAu->pNalUnitsList[pCurAu->uiStartPos]->sNalData.sVclNal.sSliceHeaderExt.sSliceHeader.pSps;
   pCtx->pPps = pCurAu->pNalUnitsList[pCurAu->uiStartPos]->sNalData.sVclNal.sSliceHeaderExt.sSliceHeader.pPps;
 
-  //try to allocate or relocate DPB memory only when IDR arrival.
-  if (NAL_UNIT_CODED_SLICE_IDR == pCurAu->pNalUnitsList[pCurAu->uiStartPos]->sNalHeaderExt.sNalUnitHeader.eNalUnitType ||
-      pCurAu->pNalUnitsList[pCurAu->uiStartPos]->sNalHeaderExt.bIdrFlag) {
+  //try to allocate or relocate DPB memory only when new sequence is coming.
+  if (pCtx->bNewSeqBegin) {
     WelsResetRefPic (pCtx); //clear ref pPic when IDR NAL
     iErr = SyncPictureResolutionExt (pCtx, pCtx->pSps->iMbWidth, pCtx->pSps->iMbHeight);
 
diff --git a/codec/decoder/core/src/manage_dec_ref.cpp b/codec/decoder/core/src/manage_dec_ref.cpp
index a922af7c..805afb71 100644
--- a/codec/decoder/core/src/manage_dec_ref.cpp
+++ b/codec/decoder/core/src/manage_dec_ref.cpp
@@ -109,6 +109,26 @@ void WelsResetRefPic (PWelsDecoderContext pCtx) {
  */
 int32_t WelsInitRefList (PWelsDecoderContext pCtx, int32_t iPoc) {
   int32_t i, iCount = 0;
+
+  if ((pCtx->bNewSeqBegin) && (pCtx->sRefPic.uiRefCount[LIST_0] <= 0) && (pCtx->eSliceType != I_SLICE && pCtx->eSliceType != SI_SLICE)) {
+    if (pCtx->iErrorConMethod != ERROR_CON_DISABLE) { //IDR lost!, recover it for future decoding with data all set to 0
+      PPicture pRef = PrefetchPic (pCtx->pPicBuff[0]);
+      if (pRef != NULL) {
+        memset (pRef->pData[0], 0, pRef->iLinesize[0] * pRef->iHeightInPixel);
+        memset (pRef->pData[1], 0, pRef->iLinesize[1] * pRef->iHeightInPixel / 2);
+        memset (pRef->pData[2], 0, pRef->iLinesize[2] * pRef->iHeightInPixel / 2);
+        pRef->iFrameNum = 0;
+        pRef->iFramePoc = 0;
+        pRef->uiTemporalId = pRef->uiQualityId = 0;
+        AddShortTermToList (&pCtx->sRefPic, pRef);
+      } else {
+        WelsLog (pCtx, WELS_LOG_ERROR, "WelsInitRefList()::PrefetchPic for EC errors.\n");
+        pCtx->iErrorCode |= dsOutOfMemory;
+        return ERR_INFO_REF_COUNT_OVERFLOW;
+      }
+    }
+  }
+
   PPicture* ppShoreRefList = pCtx->sRefPic.pShortRefList[LIST_0];
   PPicture* ppLongRefList  = pCtx->sRefPic.pLongRefList[LIST_0];
   memset (pCtx->sRefPic.pRefList[LIST_0], 0, MAX_REF_PIC_COUNT * sizeof (PPicture));
diff --git a/codec/decoder/core/src/pic_queue.cpp b/codec/decoder/core/src/pic_queue.cpp
index 71fe57f9..aef58b2d 100644
--- a/codec/decoder/core/src/pic_queue.cpp
+++ b/codec/decoder/core/src/pic_queue.cpp
@@ -135,7 +135,7 @@ PPicture PrefetchPic (PPicBuff pPicBuf) {
     pPicBuf->iCurrentIdx = iPicIdx;
     return pPic;
   }
-  for (iPicIdx = 0 ; iPicIdx < pPicBuf->iCurrentIdx ; ++iPicIdx) {
+  for (iPicIdx = 0 ; iPicIdx <= pPicBuf->iCurrentIdx ; ++iPicIdx) {
     if (pPicBuf->ppPic[iPicIdx] != NULL && pPicBuf->ppPic[iPicIdx]->bAvailableFlag
         && !pPicBuf->ppPic[iPicIdx]->bUsedAsRef) {
       pPic = pPicBuf->ppPic[iPicIdx];
diff --git a/codec/decoder/plus/src/welsDecoderExt.cpp b/codec/decoder/plus/src/welsDecoderExt.cpp
index 24cacb7f..71b33d4e 100644
--- a/codec/decoder/plus/src/welsDecoderExt.cpp
+++ b/codec/decoder/plus/src/welsDecoderExt.cpp
@@ -373,12 +373,14 @@ DECODING_STATE CWelsDecoder::DecodeFrame2 (const unsigned char* kpSrc,
     //for AVC bitstream (excluding AVC with temporal scalability, including TP), as long as error occur, SHOULD notify upper layer key frame loss.
     if ((IS_PARAM_SETS_NALS (eNalType) || NAL_UNIT_CODED_SLICE_IDR == eNalType) ||
         (VIDEO_BITSTREAM_AVC == m_pDecContext->eVideoType)) {
+      if (m_pDecContext->iErrorConMethod == ERROR_CON_DISABLE) {
 #ifdef LONG_TERM_REF
-      m_pDecContext->bParamSetsLostFlag = true;
+        m_pDecContext->bParamSetsLostFlag = true;
 #else
-      m_pDecContext->bReferenceLostAtT0Flag = true;
+        m_pDecContext->bReferenceLostAtT0Flag = true;
 #endif
-      ResetParameterSetsState (m_pDecContext);  //initial SPS&PPS ready flag
+        ResetParameterSetsState (m_pDecContext);  //initial SPS&PPS ready flag
+      }
     }
 
     IWelsTrace::WelsVTrace (m_pTrace, IWelsTrace::WELS_LOG_INFO, "decode failed, failure type:%d \n",