normal hdsdi - is a lower quality output signal than rgb 4:4:4 from a dvi or vga monitor-

describing an RGB monitor as displaying illegal colour in YUV colour space is
the wrong way round-

normal HDSDI cannot display a full resolution RGB 4:4:4 signal - whatever the refresh rate-
-

HDSDI is YUV encoded and 4:2:2 - same old broadcast bandwidth limiting exercise-
the conversion from RGB to YUV is never lossless - hdsdi is downsampled- its worse than DVI/VGA not better

DVI/vga is higher quality than hdsdi...

broadcast colour is lower quality than RGB 444- i think you have been taking the wrong broadcast based medicine...

http://en.wikipedia.org/wiki/Serial_digital_interface
For all serial digital interfaces (excluding the obsolete composite encodings), the native color encoding is 4:2:2 YCbCr format. The luminance channel (Y) is encoded at full bandwidth (13.5 MHz in 270 Mbit/s SD, ~75 MHz in HD), and the two chrominance channels (Cb and Cr) are subsampled horizontally, and encoded at half bandwidth (6.75 MHz or 37.5 MHz). The Y, Cr, and Cb samples are co-sited (acquired at the same instance in time), and the Y' sample is acquired at the time halfway between two adjacent Y samples.
the use of 29.97 and all the insane resulting confusing is just so confusing to everyone. its not an advantage of hdsdi - its an albatross.

Quote Originally Posted by SourceChild View Post
The biggest issue is having consistent color. Using a scope to test the HD-SDI out from a converted mac shows tons of illegal colors. Also, matching the color is a pain. Sync is an issue as well as frame delay. Since a mac is 60Hz, the multiple is 30fps which is not 59.94 or 29.97 so every 10 seconds is a subtle frame skip. It works but if your director takes Cat as a direct broadcast feed, then the producers won't be happy.



I'll probably get and test the first HD-SDI solution that does 59.94 with broadcast color as an output option.

Still though, for all the companies using HD-SDI as their primary pipeline to the projection sources, a video card that works would be great.



A card that fits in an xServe is great compared to trying to shoehorn a card that doesn't and having apple reject support because of it.