Andrae Palmer
Well-known member
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I wasnt talking about hardware scaling that happens inside of the Kona. As Vlado mentioned, his own software QTAKE HD is pushing GPU processed frames out of the Kona 3. There *is* a performance hit going through a Kona VS being output "natively" through the Quadro but this myth that GPU accelerated graphics cannot be pushed out via SDI in OSX just isn't true.
Yes... he did mention that Qtake HD is able to do this... what he didn't mention was if he did any special coding to allow this. Also what exactly is the nature of his GPU processing?
My video assist application QTAKE HD is pushing frames to GPU for processing and reading back to play them out through Kona3. And it can do realtime dual stream HD!
"Kona3 SDI Outputs are also enabled, although without processing in LIVE mode." -QTake HD
Vlado why does your site state that you can't do it with live processing to the Kona 3 SDI?
Sheila Santos & Etienne Clement developers of Smoke on Mac has stated that a majority of the porting work was doing efficient coding to allow Real-Time output via SDI.
Sheila Santos said:That was a big chunk of the porting work, getting enough performance for 2 streams HD (disolves) on the preview.
Eitienne Clement said:Realtime preview out the the KONA SDI is possible for two main reasons. First, both the Quadro FX 5600 and 4600 are PCI-E second generation cards which give an improved transfer performance. Second, we spent a lot of time improving our code to make sure that we read and write from both the Quadro and KONA cards as efficiently as possible.
http://www.fxguide.com/qt/1717/fxguidetv-smoke-on-mac/comment-page-1#comments
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We are planning on adding video out from R3D and other RGB sources to the R3D/Rocket SDK (targeting early next year).
Great news.
It's been possible well before SL and in 32bit. The main limiting factor is the readback performance on the gfx card although it's still alot of data moving back and forth. It would nice if apple added direct support for the quadro hdsdi also.
Being a software developer can you give us any detail on what technical issues developers face when doing Real-Time preview via SDI on the Mac?