Add support for Real-ESRGAN

[aa-ko]

Hi everyone,

a few months ago, I wanted to upscale some old DVDs and tested different algorithms in the process. In my opinion, the only algorithm I was able to find, that consistently produces better looking results than even RealSR was Real-ESRGAN.

The changes in this PR were enough to make it work for me and the results are amazing. There are some caveats though:

1. Choosing Real-ESRGAN completely ignores the noise flag.
2. Since I wanted to work on real life footage and not anime, the only model I tested was realesrgan-x4plus.
3. I don't have a lot of experience working with Python, so I tested this in a Podman container only!

I would like to see Real-ESRGAN officially supported in video2x and I believe there already were some people asking about it in the past, so I'd really appreciate some feedback and/or guidance to make this work for everyone! :)

[rdwz]

Hi, I've just come across this newer version, haven't had the chance to try it out myself yet, but it has Real-ESRGAN support

https://github.com/AaronFeng753/Waifu2x-Extension-GUI/releases/tag/v3.113.01

Video, Image and GIF upscale/enlarge(Super-Resolution) and Video frame interpolation. Achieved with Waifu2x, Real-ESRGAN, Real-CUGAN, RTX Video Super Resolution VSR, SRMD, RealSR, Anime4K, RIFE, IFRNet, CAIN, DAIN, and ACNet.