Originally Posted by parkgt
I have a 425CMX and Key digital card due to arrive soon and would like to decide what signals are best to feed it to keep down the amount of duplication is scaling etc.
The two sources are:
DirectTV HR10-250 HD DVR
if HDMI: 480i, 480p, 720p, 1080i ?
if component is it any different?
Thinking 1080i might be best for this one?
Thinking 480i might be best here?
Your input is appreciated!
Key Digital makes an excellent processor. Therefore, if at all possible you want it to perform as many video processing functions as possible. Conversely, to the extent possible, you only want the Key card doing the processing, not other components. In particular, if possible, you don't want other inferior components' processing to be redundant with the Key card and tainting the signal.
For a STB, avoid its processing by configuring it to pass the signal through as received, 720p goes through as 720p and 1080i goes through as 1080i. STBs have cheap processors and you don't want yours to mess up the signal. Many STBs allow this with a "native" setting or some such setting.
For a SD DVD, I would recommend if possible sending a signal as 480i over a digital connection. This is not always possible but if your player can do this it will again avoid processing in the player and allow the Key card to do its thing in a quality way.
Of course, it always pays to try the signal path several diferent ways. Perhaps with your particular components you will have better luck with another chain of processing.
Remember motion de-interlacing is one of the more difficult things to do correctly and so if your original source is interlaced (SD DVD and 1080i broadcasts) try to send the interlaced signal to the display and let the Key card do what you paid for. I think you will get the best PQ this way.
Finally. Please report back and tell us what you find with various setups as we would all like to hear what you actually find.