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Merge pull request #2075 from sijchen/fix_abnormal_tid

[Encoder] change the solution when invalid tid is found

--- a/codec/encoder/core/src/wels_preprocess.cpp

+++ b/codec/encoder/core/src/wels_preprocess.cpp

@@ -1037,7 +1037,10 @@

                                           (pCurPicture->iHeightInPixel >> 3) * STATIC_SCENE_MOTION_RATIO));

   const uint8_t iCurTid = GetTemporalLevel (&pSvcParam->sDependencyLayers[m_pEncCtx->sSpatialIndexMap[0].iDid],

                           m_pEncCtx->iCodingIndex, pSvcParam->uiGopSize);

-  const int32_t iClosestLtrFrameNum = (iCurTid != INVALID_TEMPORAL_ID ?  pCtx->pLtr[iTargetDid].iLastLtrIdx[iCurTid] : -1);//TBD

+  if (iCurTid == INVALID_TEMPORAL_ID) {

+    return LARGE_CHANGED_SCENE;

+  }

+  const int32_t iClosestLtrFrameNum = pCtx->pLtr[iTargetDid].iLastLtrIdx[iCurTid];

   if (pSvcParam->bEnableLongTermReference) {

     GetAvailableRefListLosslessScreenRefSelection (pSrcPicList, iCurTid, iClosestLtrFrameNum, &sAvailableRefList[0],

         iAvailableRefNum,