Documentation: Add svt-av1 to the `--photon-noise` supported encoders

[Littux-Dustux]

The documentation currently states that --photon-noise is only supported by aom and rav1e, when it works fine with svt-av1 (Tested using svt-av1-psy)

    --photon-noise <PHOTON_NOISE>
        Generates a photon noise table and applies it using grain synthesis [strength: 0-64]
        (disabled by default)

        [...]

        This option currently only supports aomenc and rav1e.

[trixoniisama]

That would be because mainline SVT-AV1 has only merged the photon-noise patch very recently, even though we've had access to it for more than a year in Soichiro's fork initially, then BlueSwordM's fork with some other patches and in SVT-AV1-PSY then. It should indeed be changed.

[gitoss]

The commit is for the fix-docs branch only - is av1an photon noise working for svt-av1 by now because it added --fgs-table?

[shssoichiro]

Looks like I forgot to update the docs when I merged in the patch to av1an to support photon noise in svt-av1. It is indeed working, only the documentation needs updated.

[gitoss]

Looks like I forgot to update the docs when I merged in the patch to av1an to support photon noise in svt-av1. It is indeed working, only the documentation needs updated.

Thanks for the clarification.

Speaking of docs, the photon noise implementation is still a bit black-box-ish :-) and I am wondering what enabling av1an's --photon-noise does to the encoders' DE-noise settings - i.e. REEMOVING noise (svt --film-grain-denoise / aom --enable-dnl-denoising & --denoise-noise-level).

The --help of svt is especially unhelpful because the description for --film-grain-denoise only refers to --film-grain, but doesn't mention --fgs-table

Concerning adding noise, the doc 'the two should not be used together" is clear that photon and non-photon are mutually exclusive.

[shssoichiro]

Photon noise does not enable any of the encoder's denoising. You're right, it may make sense to add that to the documentation as well.