Just passing by to reference Infognition's Video Enhancer website and their comparative examples from multiple resizers (including nnedi3):
http://www.infognition.com/articles/video_resize_shootout.html
"For this shootout we've gathered 17 different tools for image and video resizing. 10 high resolution video fragments were downsized 4 times and then upsized with different methods and tools. Upsized videos were compared with original hi-res ones and Y-PSNR metric was calculated for each of them."