Changes between Initial Version and Version 1 of Ticket #239


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Timestamp:
29 Apr 2019, 18:14:19 (6 years ago)
Author:
ksuehring
Comment:

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  • Ticket #239 – Description

    initial v1  
    11In the WCG_EXT macro enabled by the tool In-Loop Rashaping, the RD cost in the RDO process will be calculated by the unadjusted lambda and lambda-derived distortion scale factor as shown in the code:
     2{{{
    23#if WCG_EXT
    34double RdCost::calcRdCost( uint64_t fracBits, Distortion distortion, bool useUnadjustedLambda )
    … …  
    1314#endif
    1415}
     16}}}
    1517These unadjusted parameters are saved before encoding a slice and been applied for all CTUs in this slice since the CTUs share the same initial lambda and QP. But when rate control is applied, the lambda and QP of each CTU will be determined dynamically by the allocated rate to satisfy the rate constraint, varying from the parameters of the current slice. The RD cost will be improperly calculated by the unadjusted lambda and distortion scale parameters, leading to a huge quality decrease.
    1618