[x265] limit-refs at higher RD?

[Deepthi Nandakumar]

Hello,

Please see below.

On Fri, Jun 19, 2015 at 10:53 PM, Joshua Bowman <silverbacknet at gmail.com>
wrote:

> Are there any plans to implement --limit-refs for RD levels above 4? This
> option is a better
> quality/speed trade-off than lowering the RD level or lowering refs, so
> I'm hoping that it'll do
> the same at more intense levels. I'd like to keep more references around
> more for keeping scene
> changes in the buffer than to actively use them all the time.
>

Yes, indeed. This has been under development for some time. Some patches
were emailed on these,
however they caused a noticeable drop in visual quality, and hence needed
to be reworked.


> On that note, do you foresee ever implementing custom control of the RPS
> to keep long-term
> references? (Such as keeping the last ref before the last few scene
> changes around, it case the
> video cuts back to one.) Or is that outside of x265's scope?
>

It's not outside x265's scope, especially with explicit support of long
term RPS in the HEVC specification.
We'd be happy to accept patches on this....

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