Why are Kona/Decklink HDSDI not connected to the GPU?

[tillHavis]

Ok I am not a techie but I just read a thread saying that the Kona/Decklink HDSDI are not connected to the GPU and was wondering why this is at it seems that most real time color correction and non destructive layering is now being done this way. Please correct me if I'm wrong on this but can anybody explain in lay man's terms why this is ?

[NateWeaver]

With Apple products it is. The output of the Color and Motion come directly from the GPU and are piped to a Kona.

Not all applications do this, though.

[tillHavis]

Thanks Nate.

[Graeme Nattress]

Piped directly to - yes, connected directly to, no. The data has to come back off the GPU, then onto the buss, then up to the HD-SDI card. The data may not be in the correct form for the HD-SDI card and need processor interaction to mangle it. Notice how once you send GPU video out your HD-SDI card it all starts to go slow?

And hencewhy on the PC you've got Nvidia cards with direct HD SDI output built in!

Graeme

[David Battistella]

Piped directly to - yes, connected directly to, no. The data has to come back off the GPU, then onto the buss, then up to the HD-SDI card. The data may not be in the correct form for the HD-SDI card and need processor interaction to mangle it. Notice how once you send GPU video out your HD-SDI card it all starts to go slow?

And hencewhy on the PC you've got Nvidia cards with direct HD SDI output built in!

Graeme

Graeme,

Is there a plan for a V-OUT from RED ALERT or REDCINE?

I'd love this feature.

David

[Michele Gavazzeni]

The output of the Color and Motion come directly from the GPU and are piped to a Kona.

And works well!!

The data may not be in the correct form for the HD-SDI card

so basically its a software developers problem that aren't able to develop a proper code and are obliged to use a hardware solution witch is implemented only in Nvidia SDI cards.

[Graeme Nattress]

No, it's purely a hardware issue! Even if the data does not need to be reformatted it still needs to come back down from the GPU which is slow, and go across the buss to the other card. The only efficient way is for the SDI output to be on the GPU card so the image always flows forwards and never backwards.

Graeme

[Michele Gavazzeni]

Understood Graeme thanks...

[Gunleik Groven]

So, any idea why the "creative" apple does not support this?


Gunleik
(slowly becoming a hater of Apples ProApps as my Red experience moves on...)

[Cüneyt Kaya]

So, any idea why the "creative" apple does not support this?


Gunleik
(slowly becoming a hater of Apples ProApps as my Red experience moves on...)

did someone reported how a CC software works under bootcamp and a quaddro?