Originally Posted by JohnWH
Maybe I'm mis-reading what you're saying, but you didn't compare 480/576i HDMI/DVI to 480/576i SDI, you compared the SDI feed to a 480/576p feed on HDMI/DVI. As Bob and others already pointed out this isn't a useful comparison as you have invoked the players deinterlacing and processing for the HDMI feed...
John, see my edited posts above.http://www.avsforum.com/avs-vb/showt...&&#post8062922http://www.avsforum.com/avs-vb/showt...&&#post8070076
I completely agree that you can only do a true comparison when BOTH SDI and HDMI 480/576 streams have NO processing involved in their output stream once the signal leaves the decoder. We know SDI is clean, it's just that so far we haven't seen a better or identical performance from HDMI at 480/576i. So we are all assuming (hoping?) that that is due to the fact that players tested so far all somehow process the 480/576i stream (beyond just adding HDCP) before it gets to the HDMI connector. We all agree (I think) that in theory there ought to be zero difference between the two.
So, I guess this debate can be viewed from 2 angles. One is more focused on what players we can buy off the shelf that have equal (or even better?) performance on HDMI 480/576i than that SAME player (or one which has the same decoder
chip) fitted with SDI. This I think might rule out the OPPO 970H with HDMI vs the 971H with SDI, comparison.
The other is whether SDI is inherently better than the equivalent HDMI (with same colour space and bits of resolution) and if so, why the hell, as we can't see any reason why it should be!! This really requires say an OPPO 970H to be modded with SDI - nowhere near as simple as modding a 971H the Oppo people say. The connection points are all over the place and may in some cases only be available from a via, or worse still, from a buried via.
To cap off this discussion, say you did prove that one or the other was better on this particular player, a brand with a better decoder could usurp the results on either or both output formats. Don't forget too, that the differences may only be evident on some displays. The more scaling the display does, the more likely it is that the results will be masked by scaling artifacts.
In my comparison between the 971H DVI and SDI output, I got as close as I could to get the 2 equal, bar de-interlacing. I set the DVI res to match the SDI output, so no scaling should in theory be taking place inside the Faroudja. All other enhancements were set to OFF or ZERO, so again, no processing should be taking place.
But, isn't this exactly what we're on about here? We are assuming that no processing is taking place either inside the Faroudja OR the HDMIi garnering of the signal from the decoder to the DVI/HDMI connectors. It ain't going to be easy to find the perfect platform to do a just/scientific comparsion.