Pixel accurate output to SDI?

[OlliR]

You can even set the DVI-Tag in the ImagePro - but I never tried it with 768 x 576 so far...(and I am not sure it is available...)
The ATI graphics cards are quite flexible in their output resolution.

DVI is no option in this application because my signal will run through a video mixer before getting to the LED wall...

HD-SDI is also no option as the LED wall´s controller only accepts SD signals (... and on the HD side you have a 1920x1200 opposed to 1920x1080 situation...)

Thanks for your reply...

Olli

[Spam Butterfly]

You could scan convert the output using the image pro to send to the vision mixer and loop thru the DVI to the LED wall processors. The only way of getting pixel accurate stuff is to use DVI. I've just done this on Muse - DVI from Catalyst thru a Folsom Image Pro (using the loop thru) to Barco Encore (which you can program EDID on), sending an SDI signal to Imag. The Encore takes the DVI from Catalyst as a Background layer (i.e. unscaled) and sends that to the LED wall processor. Obviously, you don't need an Encore to do this... Beware if you use the Image Pro to scale you'll lose a frame and a half...

Hugh

[samsc]

just to make things a little more complex - sdi isnt 768x576 its 720x576? - non square pixels - i believe?

its a long and complex scaling chain -

what is the resolution of your output led wall? - in pixels - i just did a show with this signal path - but the output was something like 640x366 pixels - taking an sdi input-

[OlliR]

The native LED resolution would have been 1536 x 96 pixels...
...it would have been a four row split on a PAL-canvas - would have done that with four mixes on one screen and Offsets.

Catalyst video content on this LED strip was cancelled this morning - so I don´t have to worry about this any longer for now...

I am not an SDI expert but as far as I know every frame in PAL-SD-SDI consists of 864 x 652 pixels total image size.
Depending on your hardware 720 x 576 or 768 x 576 pixels will be used as active picture area...

Olli