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March 16th, 2009, 03:00 PM
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#1 |
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Major Player
Join Date: Apr 2005
Posts: 285
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Blackmagic/FCP: Capture to Prores HQ?
Hi, can I use a blackmagic intensity in a mac pro to capture to prores HQ (220mb/sec=28ishMb/sec?) via an hv30 through HDMI? (No, I'm not shooting to HDV first; the camera will be tethered.)
The mac pro can compress to prores in real time, right? And I won't need any sort of RAID array or fast drive, correct? And how do I then remove pulldown if shooting in 24p? Thanks, -Matt |
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March 16th, 2009, 07:42 PM
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#2 |
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Major Player
Join Date: Nov 2006
Location: BOCa raton fl
Posts: 342
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no
You will need a raid to be able to capture at that data rate . So I think you will not be ble to do this without serious hardware
Doug |
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March 16th, 2009, 08:00 PM
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#3 |
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Major Player
Join Date: Apr 2005
Posts: 285
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Ah, I was afraid of that.
From what I've read, WD raptors (10krpm) claim transfer rates around 200M/b a second, while pro-res HQ 1080p/60i is only about 28M/b a second, but I have noticed drive performance is generally much slower than specifications suggest. That said, is the mac pro even fast enough to compress to prores in real time from 1080p HDMI or would I have to capture full raster uncompressed (which would need a very large RAID array) in the first place? I can't afford a RAID array right now; I only make about $250/week at my job and have other expenses. |
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March 17th, 2009, 09:32 AM
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#4 |
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Regular Crew
Join Date: Jul 2007
Location: Los Angeles, CA
Posts: 26
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Then work within your means and just capture to the internal hdv.
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March 17th, 2009, 04:29 PM
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#5 |
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Major Player
Join Date: Apr 2005
Posts: 285
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Hey, that's not the right attitude! I find HDV fine for most stuff, but I'm doing mostly greenscreen (and occasional motion-matching) to match primary photography shot on a red; HDV leaves bad edges around keyed footage and heavy grading tears it apart. It's gotta be pro-res or cineform or something much better than hdv.
How about using terminal to make a RAM disk? There's got to be some way... Anyhow, once I have all the hardware I'll test things out and see what's up; I'm surprised more people haven't tried this. |
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March 17th, 2009, 05:30 PM
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#6 |
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Major Player
Join Date: Oct 2007
Location: London
Posts: 201
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Sure you can
You can record to a mac pro single HDD if you choose to compress to a manageable data rate - no need for a raid.I am on a PC.I have been recording to a laptop for over a year now with a magma chassis through a Blackmagic design Intensity card to Cineform.The highest data rate for Cineform is around 24 MB/s and my notebook has handled it well.Awesome quality and no problems.HDD keeps up and I can shoot all day till it is full.I suspect the HDD you mentioned is up to the task so you should have no problems.As long as you have the CPU up to the task it is doable.Test test and test again.Best wishes.
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March 19th, 2009, 05:17 PM
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#7 |
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Major Player
Join Date: Apr 2005
Posts: 285
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It works fine, fast enough for prores hq; probably two raid0 drives could do uncompressed 8 bit YUV... Really shows the hv30's faults, unfortunately....
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March 20th, 2009, 08:49 PM
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#8 |
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Major Player
Join Date: Apr 2005
Posts: 285
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March 20th, 2009, 09:02 PM
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#9 | |
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Major Player
Join Date: Jul 2007
Location: Los Angeles, CA
Posts: 628
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Quote:
The only requisite is a capture card that supports Pro-Res acceleration. There are two to choose from: the Blackmagic Decklink and the other is the AJA Kona / IoHD. Sorry, but I wanted to clarify that. -C |
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March 20th, 2009, 11:55 PM
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#10 |
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Major Player
Join Date: Nov 2006
Location: BOCa raton fl
Posts: 342
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yes
With a capture card yes but why
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