Ahead-of-time x265 transcode looks much worse than Jellyfin QSV transcode

[Efficient_Good_5784]

I'm running this on a 5700X3D, so 8C/16T, on Windows. I'd probably use ffmpeg in WSL. The Jellyfin server has a i5-9500T, which is 6C/6T.

You can look at ffmpeg's website to find Windows builds of ffmpeg: https://ffmpeg.org//download.html

You just get that, unpack it, then all you need to do is navigate to it using command prompt and run it there.