Often, with limited bandwidth, different types of video compression algorithms are used.  These are very good at removing data from images without decreasing the visible result, to the human eye, too much.  However, it is very often that it is the "non-visible" information that LYYN™ V.E.T. uses for it's calculations.  Less compression equals less data removed and often produces a better result when fed through the Lyyn unit.

The result is also dependant on video-codecs, colour-depth, resolution, camera optics, sensor type etc.  Also, a better quality the camera system will produce better results from the Lyyn system.