[x265] Question regarding RDO Levels

[Steve Borho]

On Dec 4, 2013, at 10:17 AM, Selur <hybrid at selur.de> wrote:

> Signed PGP part
> 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

There should be a large "under construction" sign implied here.  We've shifted 1 & 2 to 5 & 6 and gave ourselves some room for faster modes.  This should get fleshed out and well documented in x265.h over the next week and a half.  it's not quite finalized yet.

--
Steve
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