Sample SDK SynchronizedCapture

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ThierryT

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  • Real Name: Thierry Tapie

Sample SDK SynchronizedCapture

PostWed Sep 25, 2019 1:32 pm

Hi,
I'm using DeckLink 8K Pro and I'm trying to use SynchronizedCapture sample provided by the SDk.

I use 2 blackmagic cameras as video source for the DeckLink 8k Pro, format selected is : 2160p25. The cameras are genlocked to a reference signal 1080i50, this is ok. The input reference signal of the DeckLink 8K pro is connected to the same reference signal of the cameras.

When I run CapturePreview (SDK sample), it's ok, I'm able to display the live capture of the cameras.
When I run SynchronizedCapture, I get the message " Waiting for signal lock..."
I'm doing something wrong...


All ideas will be very appreciated.

Thank's


Thierry
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Cameron Nichols

Blackmagic Design

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Re: Sample SDK SynchronizedCapture

PostThu Oct 03, 2019 4:37 am

Hi Thierry,

The SynchronizedCapture example, unlike CapturePreview, does not support auto-mode detection, so you will need to set const kDisplayMode to bmdMode4K2160p25.

Also, check that your reference is set to p50/PAL, not i50. You don't need the reference connected to the DeckLink 8K Pro for synchronized capture, only for playback. Ensure that the (presumably) URSA Mini Pro Reference Source is set to external from the menu.

It may be worth running StatusMonitor example in tandem, so you can check what input signal is being detected.

Regards
Cameron
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ThierryT

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Re: Sample SDK SynchronizedCapture

PostTue Oct 15, 2019 4:10 pm

Hi Cameron,


It's ok by now. I have configured all the cameras in 1080p25 and modify the source code of Synchronized capture to accept this format. The sample works fine.

Thierry
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ThierryT

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Re: Sample SDK SynchronizedCapture

PostWed Oct 16, 2019 7:48 am

Hi,

Is there any possibility to have Synchronized Capture for 4 SDI video inputs ?
It works only for 2 SDI inputs at the moment.
I need to capture synchronously 4 SDI video inputs with Decklink 8k Pro.

Thank's.

Thierry
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ThierryT

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Re: Sample SDK SynchronizedCapture

PostWed Oct 16, 2019 8:55 am

Hi,

I understand that synchronized capture is only possible in 2 sub-devices profile mode (see doc 2.4.11 page 32) for Decklink 8k pro. That means, it's only possible to capture 2 video inputs synchronously with one card. That's my conclusion after making some tests with Synchronized Capture sample and also with my own program.

I need to configure the inputs as followed:

- SDI 1 IN => input video from camera 1
- SDI 2 OUT
- SDI 3 IN => input video from camera 2
- SDI 4 OUT

Camera1&2 are synchronized by genlock.

Am I right ?

Thierry

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