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Is Black-Magic Support Close Caption?

PostPosted: Thu Apr 26, 2018 6:38 am
by pankajMahan
Hi,

Do Blackmagic provide any API in their development SDK to pass close caption alongside video or any other API to burn the close-Captions in the video? I'm using C++ develpment SDK of Blackmagic.

Thanks,
Pankaj Kumar

Re: Is Black-Magic Support Close Caption?

PostPosted: Fri Apr 27, 2018 3:50 am
by Cameron Nichols
Hi Panjak,

Yes, it is possible to embed Closed Caption (CEA708), encoded as SMPTE 292M packets as VANC output.

Refer to:
  • DeckLink SDK Manual - 2.4.7.2 VANC Output high level overview
  • ClosedCaptions SDK sample (Mac/Win/Linux)
Regards
Cameron

Re: Is Black-Magic Support Close Caption?

PostPosted: Mon Apr 30, 2018 6:51 am
by pankajMahan
Thanks, Cameron

Re: Is Black-Magic Support Close Caption?

PostPosted: Wed May 02, 2018 6:05 am
by pankajMahan
Hi Cameron,

I tried ClosedCaptions SDK sample for windows. I'm using a black-magic 4K card and 4k Samsung monitor and they are connected via HDMI port. But problem is that I didn't see any closed caption on the monitor. It just shows three blue frames.

Any kind of help will be appreciated.

Thanks,
Pankaj Kumar

Re: Is Black-Magic Support Close Caption?

PostPosted: Fri May 04, 2018 1:41 am
by Cameron Nichols
Hi Panjak,

Let me elaborate on my previous post. Closed Captions is supported on SDI as it follows the SMPTE ST 334 specification for transmitting in VANC for HD, or LINE21 for NTSC.

There is no equivalent standard for transmitting Closed Captions over HDMI, it is the responsibility of the content providers to decode Closed Captions within the Set Top Box.

Regards
Cameron