Deck Link simultaneous recording, 30 camera rig

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ndrt__

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Deck Link simultaneous recording, 30 camera rig

PostWed Jan 16, 2019 5:31 pm

Hi,

Not being from the Broadcast / film world hoping this forum can point me in the right direction. I'm scoping out creating a multicamera rig, matrix style, but with blackmagic micro cameras, and wondering if I can create a recording rig that uses multiple decklink cards either in one computer or across several.

I've searched around and found some info but wondering if anyone has any hands on experience recording from multiple cameras simultaneously using decklink and the API or blackmagic software - is it plausible to record 4, 8 or more channels of 1080 or UHD/4K even (if using the micro studio)? I'm guessing there's a bottle neck at some point saturating the disk write speed, though if it's a decent M.2 drive that point is higher than it would previously have been with SSDs? But in theory could I load a single computer with one or more decklink cards and record on all the inputs at once? I'm looking to get 30 or more cameras going at the same time.

Is this at all plausible or am I barking up the wrong tree?
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Fred Rodrigues

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Re: Deck Link simultaneous recording, 30 camera rig

PostThu Jan 17, 2019 4:53 am

While it may be possible to get a lot (say 8+) streams recording simultaneously it will not be fun. The overhead to encode in anything but uncompressed video will get too high for a CPU, to get this many inputs working you will need a CPU with a lot of PCIe lanes and you will not have the single core power to do that many streams. Uncompressed does not use this overhead but your Nvme drive will be eaten fast by a few streams. Frame sync will be very tough as you will need a buffer and this will make it a very difficult system to build code and run.

If this is a real project then get a channel of sync-able hard disk recorders with timecode and (like some models of hyperdeck). Do a lot of testing on rental before you buy and check for scalability before you invest.

TLDR No it is not possible on one computer and the cost of getting 4 or more computers good enough to share this task makes easier and more reliable options more economical.
http://www.fredrodrigues.net/
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7live italy

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Re: Deck Link simultaneous recording, 30 camera rig

PostThu Jan 17, 2019 9:34 am

yes, with software "movie recorder" for mac, up to 16 channels, tunderbolt 3, n.2 deck link card blackmagic.
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Zack Pittman

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Re: Deck Link simultaneous recording, 30 camera rig

PostSat Jan 26, 2019 11:32 pm

I have built a rig to do this very thing! I can do a max of 32 channels of ProRes. It’s possible, but expensive. I have a new rig being built right now that can add 8 channels of H264 on top of this.
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Jack Fairley

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Re: Deck Link simultaneous recording, 30 camera rig

PostMon Jan 28, 2019 6:46 am

Why Mac Pros?
Threadripper 1950X 3.7GHz
64GB DDR4-2666
2x GTX 1080 Ti
DeckLink 4K Extreme 12G
Resolve Studio 15.3.1
Windows 10 Pro 1803

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