How to embed compressed audio in SDI?

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ztutberidze

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  • Joined: Thu Sep 29, 2022 4:56 pm
  • Real Name: Zurab Tutberidze

How to embed compressed audio in SDI?

PostThu Sep 29, 2022 4:59 pm

Hello, I have DeckLink 8K Pro and trying to develop a simple playout software to play videos over SDI, all is good except the compressed audio. Anyone can tell me if it is possible to embed compressed audio? In the SDK I see only pcml.


Thank you in advance.
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Peter Cave

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Re: How to embed compressed audio in SDI?

PostFri Sep 30, 2022 12:00 am

PCM audio is the SDI standard. I don't think compressed audio is supported in an embedded SDI signal.
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ztutberidze

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Re: How to embed compressed audio in SDI?

PostFri Sep 30, 2022 11:24 am

NON-PCM audio has been standardized for more than 10 years. DOLBY DIGITAL and DOLBY E are standardized.
AES is used to deliver DOLBY E.
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Steve Fishwick

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Re: How to embed compressed audio in SDI?

PostFri Sep 30, 2022 6:22 pm

ztutberidze wrote:NON-PCM audio has been standardized for more than 10 years. DOLBY DIGITAL and DOLBY E are standardized.
AES is used to deliver DOLBY E.


They may have been standardised but they are both very old and mostly deprecated. Dolby digital is a no go, according to this reply from BMD themselves: https://forum.blackmagicdesign.com/viewtopic.php?f=12&t=52349 but there is a user there who used Dolby E. Careful with monitoring if you get it to work since it's encoded at full level and will blow speakers, if undecoded. Only the UltraStudio 4K Extreme 3 has AES, according to the specs, there is no mention of it in the DeckLink 8K Pro specs.

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