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Merge pull request #3405 from vacing/feature-diff-idc-for-tl4

modify nal_ref_idc from 3 to 2 for level 1 when output 4 temporal layers

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

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

@@ -3616,6 +3616,8 @@

       eNalRefIdc = NRI_PRI_LOWEST;

     else if (1 + iCurTid == iDecompositionStages)

       eNalRefIdc = NRI_PRI_LOW;

+    else if (2 + iCurTid == iDecompositionStages)

+      eNalRefIdc = NRI_PRI_HIGH;

     else // more details for other temporal layers?

       eNalRefIdc = NRI_PRI_HIGHEST;

     pCtx->eNalType = eNalType;