[x265] Use cases for aq-mode=4

[Nomis101 🐝]

Thank you very much Akil for your explanation!



Am 08.08.19 um 08:57 schrieb Akil:
> Hi Nomis,
> Thanks for asking and your interests in aq-mode 4. The AQ enabled with auto-variance and edge information (aq-mode 4) is additional support that we are providing over the aq-mode 2 (AQ with
> auto-variance). We have enabled a Gaussian LPF for noise removal and an edge filter that highlights the noiseless edges information and its directions in the pictures. Considering these parameters, we
> have modified the QP for every block. The particular well-suited use-cases for this mode will be videos with high edge contents. (Ex: Ducks take off, Crowd run, Raindrops etc). Please write to us if
> you have more questions. :) 
> 
> On Thu, Aug 8, 2019 at 3:25 AM Nomis101 🐝 <Nomis101 at web.de <mailto:Nomis101 at web.de>> wrote:
> 
>     I know, all the command line options are may give an improvement for one situation and others where they don't give an improvement or even hurt quality. So, I've learned aq-mode=3 is best for dark
>     scenes (in SDR). But, I was wondering about the (best) intended use cases for the new aq-mode=4? The documentation says "AQ enabled with auto-variance and edge information". This sounds very good.
>     But, is this good for SDR or HDR? For film or anime? For scenes with lots of motion or less motion? What are the intended use cases? I did some experiments, but they did not give me much
>     clarification. And searching the web also didn't help.
> 
>     Regards,
>     Simon
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> 
> 
> -- 
> /*Regards,*/
> /*Akil R*/
> 
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