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Add casts when converting from int64_t or double to int32_t

This fixes warnings when building with MSVC.

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

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

@@ -821,7 +821,7 @@

     pEncCtx->iCheckWindowCurrentTs = pEncCtx->iCheckWindowStartTs = uiTimeStamp;

     pEncCtx->bCheckWindowStatusRefreshFlag = true;

   }

-  pEncCtx->iCheckWindowInterval = pEncCtx->iCheckWindowCurrentTs - pEncCtx->iCheckWindowStartTs;

+  pEncCtx->iCheckWindowInterval = (int32_t) (pEncCtx->iCheckWindowCurrentTs - pEncCtx->iCheckWindowStartTs);

   if(pEncCtx->iCheckWindowInterval >= (TIME_CHECK_WINDOW >> 1) && !pEncCtx->bCheckWindowShiftResetFlag) {

     pEncCtx->bCheckWindowShiftResetFlag = true;

     for (int32_t i = 0; i < iSpatialNum; i++) {

@@ -875,7 +875,7 @@

   SWelsSvcRc* pWelsSvcRc = &pEncCtx->pWelsSvcRc[pEncCtx->uiDependencyId];

   if (pWelsSvcRc->iPredFrameBit != 0)

-    pWelsSvcRc->iPredFrameBit = LAST_FRAME_PREDICT_WEIGHT * pWelsSvcRc->iFrameDqBits + (1 - LAST_FRAME_PREDICT_WEIGHT) * pWelsSvcRc->iPredFrameBit;

+    pWelsSvcRc->iPredFrameBit = (int32_t) (LAST_FRAME_PREDICT_WEIGHT * pWelsSvcRc->iFrameDqBits + (1 - LAST_FRAME_PREDICT_WEIGHT) * pWelsSvcRc->iPredFrameBit);

   else

     pWelsSvcRc->iPredFrameBit = pWelsSvcRc->iFrameDqBits;