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DeckLink SDI ancillary data

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Martin Cole
DeckLink SDI ancillary data
on Aug 25, 2010 at 6:03:50 pm

I am in the process of attempting to switch my companies capture solution to the DeckLink SDI and DeckLink Duo cards.

I am able to capture video and audio fine, and have moved on to getting the closed caption data in the ancillary data, where I am having problems.

I am running the DeckLink 7.7.3 drivers on Ubuntu 10.04, currently with the DeckLink SDI.

I have the 7.7.2 version of the SDK.

using IDeckLinkVideoFrameAncillary::GetBufferForVerticalBlankingLine with a 720p source (verified with our previous card to have 708 cc data) this call returns 25 lines of ancillary data, all of which I am copying out and searching through simply to find the cdp_header start code (0x9669) I never get it.

As per spec I am searching in the Y stream, also I am capturing bmdFormat8BitYUV.

Is there some extra processing that this call does to the ancillary data?
Or am I missing something fundamental?

Any example code for parsing out cc data?

thanks for any help.


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Daniel Moore
Re: DeckLink SDI ancillary data
on Aug 25, 2010 at 11:23:57 pm

Hi Martin,

You need to capture in 10 bit as the two bits that are stripped to
capture in 8 bit are significant in the CC data.

For more details, please contact Blackmagic Developer Support at:

developer@blackmagic-design.com

cheers,

Daniel


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