After 3 months of 12+ hours daily work, I can finally halt temporarily Papalotl. I do plan to continue it's development, but due to hardware limitations, I've decided that I can't improve this further.
There's no amount of optimization that will squeeze out more performance for CPU based 30/60FPS real time capture.
Free download/trial: https://ko-fi.com/s/f73d0b069f
PS: I'm not "trying to reinvent the wheel" and it's the main reason why I'm providing a trial version.
I hope you find it useful. Please try it.
If it's not for you, simply delete the .exe.
This is not abandonware.
I literally can't improve this further without sacrificing output quality massively.