[RONM]

If SDI is the best way to transmit video data then why isn't it offered

from manufacturers of DVD players right out of the box?

 

[Kris Deering]

Because SDI is a professional video transmission system that doesn't have any copyright guards at all, and it is digital. Studios woudn't like that.

 

[RONM]

Is DVI or HDMI similar enough to be as good?

 

[Krobar]

HDMI is capable of being as good. DVI is inferior since it must be run in 4:4:4 colour config and DVD is 4:2:2 (Near neough anyway) so hence there is an unecessary colour conversion. HDMI is capable of 4:2:2 and 4:4:4 but most devices only support 4:4:4. SDI is always 4:2:2.


Kris can probably explain the above better than me.

 

[Clepto]

SDI = 480i (digital)

DVI = 480p, 720p, 1080i (digital RGB)

HDMI = 480i, 480p, 720p, 1080i (digital RGB or Y Cb Cr)


If you want to go to an outboard scaler, SDI or HDMI 480i offer the best path, since you'll be using the dvd player as a transport only, no deinterlacing or scaling.

 

[RONM]

Thanks for the explanations.Guess I will wait and see about the newer

DVD players with HDMI.

 

[Krobar]

DVI is sort capable of 480I (some devices support it), it simply runs 480I double clocked and the scaler drops every other frame. DVI run in this way is identical quality to 4:4:4 HDMI.

 

[PooperScooper]

DVDs are encoded 4:2:0. Just because DVI doesn't support YCbCr does not mean it is inferior, less functional is more like it. Here's a great little piece that Stacey Spears wrote a while back: http://www.hometheaterhifi.com/volum...eo-9-2000.html


larry

 

[tkmedia2]

The only reason I like SDi over the others digitals is longer "cheap" cables, good PQ too... That dont hurt!