Originally Posted by stosh
Why is this unit recommended for folks with external scalers and the 971 for everyone else?
I posted this on the 971H Braindump:
Like any device, you want to feed the best signal you can to be processed. For a scaler, you want to provide it with pretty much the RAW MPEG video stream that is contained on the DVD player.
A DVD player which is outputting a progressive image is a DVD player which is applying filters to the video stream. Every filter used "molests" the original intent of the MPEG stream, to the point where you can pretty much negate the high end filtering aspects of the external scaler.
In the case of the OPDV971H, you are processing the feed first through a Faroudja chipset, which will apply its own cadence and pulldowns, motion adaptive de-interlacing, CUE removal and maintanence, DNR, and a plathera of other enhancers. And this is just a progressive alteration. Now, this "enhanced" version of the MPEG information is now sent to another processor (external scaler) which will apply even more filters and enhancers. This long chain of alterations is not ideal.
Ideally you want to feed the scaler the cleanest stream as possible, to allow the scaler to do what is was designed for: high end filtering. A clean transport will ensure tha best possible scaling, which will in turn increase the video fidelity of the final displayed image.
So, OPPO isn't saying that you shouldn't do it, they are saying that there are better options available that will produce much better results.