8K pro access independent inputs

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dibbitson

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  • Real Name: David Ibbitson

8K pro access independent inputs

PostMon Jul 16, 2018 7:35 pm

Hi Folks,

The SDK doesn't seem to have any provision in the 10.11 SDK to access the inputs individually on the 8K Pro. Other references indicate it's possible on other cards via sub-devices (even then it's not clear at all how to setup an IDeckLinkInput to source from a specific SDI channel) but the 8K Pro only reports a single sub-device.

SDK: 10.11
System: Ubuntu Linux 4.4.0

Any hints or tips here on how to get this working?

Thanks,
David
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Cameron Nichols

Blackmagic Design

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Re: 8K pro access independent inputs

PostTue Jul 17, 2018 6:40 am

Hi David,

By design, the DeckLink 8K Pro has one IDeckLinkInput device and one IDeckLinkOutput device operating as single-link, dual-link or quad-link streams.

Regards
Cameron
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dibbitson

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  • Real Name: David Ibbitson

Re: 8K pro access independent inputs

PostTue Jul 17, 2018 1:12 pm

Thanks Cameron,

Sure, and there are four quad-link 12G connectors on the card. So the question still stands, how do you use IDeckLinkInput to access them individually?

Thanks,
David
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Andrew Kolakowski

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Re: 8K pro access independent inputs

PostTue Aug 14, 2018 11:16 pm

There is 1 quad link, which is all 4xSDI connectors, which creates single stream (input/output signal).
There is no such a thing like single SDI connector which is quad.

When card is configure to work as quad link then you still have 1 input (made of 4 quadrants). They are not accessible independently.
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Xtreemtec

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Re: 8K pro access independent inputs

PostWed Aug 15, 2018 10:22 am

Andrew Kolakowski wrote:There is 1 quad link, which is all 4xSDI connectors, which creates single stream (input/output signal).
There is no such a thing like single SDI connector which is quad.

This is a bit of a Marketing Fuckup of BMD.. in there OLD marketing text with the card they mention 4 quadlink connections.. A lot of resellers have copied that text onto their webshop.. The BMD site has been adjusted now..

But in all.. The card just does 1 in 1 out.. But it can be 1x SD, HD, 3G, 6G, 12G, Duallink 3G / 6G or quadlink for four connections UHD. Still 1 in 1 out..

This card wont do 4 independent streams despite everyone is looking for that card!

It will do 4x 12G input in quadlink mode.. producing a (4 quadrant) 8K picture.

And you are able to trick it into a mode if you would sync up 4 12G outputs (like on a Atem Broadcast studio 4k were all aux and PGM outputs are in exact sync) You would be able to feed 4 different 12G images into the card..

But you need to write a software hook to cut the 8K picture into 4 streams again.

So what that means is that the card is able to receive 4x 12G connection.. But only if they are all the same resolution and framerate, and running in perfect sync.
Which means that there is no framebuffer for each link.. Probabbly they capture the data direct at the point of entry up to the PCI bus.. Without using any frame buffering.. But that part i'm really not sure.. PC hardware software isn't my area of expertise..
Daniel Wittenaar .:: Xtreemtec Media Productions ::. -= www.xtreemtec.nl =-
4K OBV, ATEM TVS HD, 1M/E 4K, 2M/E Broadcast Studio 4K, Hyperdeck Studio Mini, SONY FS7 4K, Ursa Broadcast 4K
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dibbitson

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  • Real Name: David Ibbitson

Re: 8K pro access independent inputs

PostThu Aug 30, 2018 4:43 pm

Thanks guys,

It took some effort to figure that out -- the documentation and marketing really added to the confusion. Makes sense now.

David

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