Upscaling SD content to HD or even 4K is something that crops up from time to time. I myself have at least some experience with up-scalers, with my preferred method involving using infognitions Super Resolution plugin for VirtualDub for live action stuff and SuperResXBR for animation. However, I recently became aware of a new up-scaler called Gigapixel AI. https://topazlabs.com/gigapixel-ai/
Needless to say, I grew quite curious about this program. Now, nowadays you can get the Super Resolution plugin free of charge, but to get Gigapixel AI, you need to pay at least $84.99 so one wonders if it’s worth it. That’s why I decided to have a discussion about it here.
As for how to use Gigapixel AI for video, there’s an excellent tutorial here: https://captrobau.blogspot.com/2019/05/tutorial-upscaling-video-with-topaz-ai.html
The same guy who wrote that tutorial has experimented with the program to upscale Star Trek: Deep Space Nine to HD and even 4K: