[x265] Question regarding RDO Levels

[Selur]

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x265.h only states:
/*Level of Rate Distortion Optimization Allowed */
typedef enum
{
    X265_NO_RDO_NO_RDOQ, /* Partial RDO during mode decision (only at
each depth/mode), no RDO in quantization */
    X265_NO_RDO,         /* Partial RDO during mode decision (only at
each depth/mode), quantization RDO enabled */
    X265_FULL_RDO        /* Full RD-based mode decision */
} X265_RDO_LEVEL;

but the CLI help states:

- --rd                          Level of RD in mode decision
0:least....6:full RDO. Default 3

the defaults in common.h
param->rdLevel = 3;

- -> any insight in what the other levels mean?

Cu Selur
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