[FFmpeg-user] Libx265 halves the quality when psy-rd is enabled for 444 input.

[Ferdi Scholten]

On 31-12-2023 04:32, Aditya Dandavate wrote:
>>> rd=3 psy-rd=2.00
>> Those (default) values are probably too high for your purpose, creating
>> artifarcts, ringing and blurring. Reduce them (1 is the recommended
>> start setting).
>>
>> Read the documentation for it:
>> https://x265.readthedocs.io/en/master/cli.html#psycho-visual-options
>> _______________________________________________
>>
> -x265-params psy-rd=1.00 sets 'psy-rd to 1' but how to change '-rd' to '1' ?
>
>
The same way,

-x265-params psy-rd=1.00:rd=1

rd accepts values 1..6 generally 1 has the fastest encoding and 6 is slowest. Where as 6 gives smaller size and 1 bigger size output.

Experiment with settings until you find appropriate values.