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4K on Mac – What will it take?
So once the Decklink 4K is available on the Mac for i/o, and given a sufficient storage solution and plenty of GPUs, how close to realtime 4K (either from RED or DPX) might a Mac Pro be able to come? What would be the limiting factors?
Seems like a certified Mac configuration for 4K material would be a good selling point for the Decklink 4K… but I’m guessing that the bottlenecks would be more on the Mac Pro hardware than Blackmagic’s design…
KC
prehistoricdigital.com
hardworkingpixels.com -
4 Replies
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As far as i have calculated with different calculators then it should drop somewhere 600-950 MB sec.
In theory it should not be a problem if gpus and all will flow nicely.
Somebody here did a while a go even calculation on pcie bus.In theory it should be possible but we will see.
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Margus
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Just in time to use that shiny 4k Sony 40 in monitor they had under wraps at NAB 😉
CJ -
I’m grading prores 4kHD 422 with realtime… Why 4k?, because I need to resize and i prefer a 4k master for a future, why not r3d?, because I don’t have rocket and i want full debayer all the time. Why prores?, because near no difference with dpx at 4k, but less space. Why not prores 444?, playback and render issues with resolve. I recomend a first basic color correct pass before raw to prores…
No problem with 2 gpus + gui, but, much better with 3… output to HD not 4k yet possible…
saludos,
Jose.
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Interesting Jose… Peter posted a while back that Resolve decodes the ProRes to get RGB for each pixel for each frame before it starts doing any other math… so a 4096×2304 ProRes should be no easier than 4096×2304 DPX, disk read speed aside, or perhaps 4K Red, RR card aside…
I tested 4096×2304 ProRes422 and playback is reasonable…I noticed it choking up on render though. Very interesting in terms of shopping for displays for the mid-to-long term, since we’ll probably see some new Mac Pros, GPUs, and maybe even a new OS in a display lifetime…
It makes me curious about the complete order of operations for Resolve though: For example does blanking/masking happen before color and blur, and therefore save you some processing? Does input resizing save you disk read speed, etc…
KC
prehistoricdigital.com
hardworkingpixels.com
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