• Blackmagic Design

  Embeded audio from Mutlibridge, and where to get PCI-EXPRESS BRIDGE?

  Posted by Ooctave on October 25, 2005 at 3:16 pm

  I have a all decklink system with 3 Decklink pro and one Decklink HD plus 4:2:2

  I receive an SDI SD signal from a camera without any audio, and want to Embed 24 tracks AES audio iinto it

  Does the Multibridge SD do audio embeding from it’s SDI input to it’s SDI output, or do I need the multibdidge extreme

  Another question:
  in the case I need the Multibridge Extreme, where can I purchase the Pci to Pci express bridge form y G5 BI-proc?

  thanks for your answer

  best regards

  Olivier Jouy

  Luke Maslen replied 20 years, 11 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Luke Maslen

  October 26, 2005 at 6:27 am

  Hi Olivier,

  There are a few technicalities of which I should make you aware.

  1. The SD-SDI limit for embedded channels of audio is 16.
  2. The HD-SDI limit for embedded channels of audio is 16.

  3. The maximum number of audio channels supported by any SD-SDI deck, of which we are currently aware, is 8 channels. Most SD decks only support 4 channels of audio but many HD decks can be used in SD and support 8 channels of audio in SD and HD.
  4. The maximum number of audio channels supported by any HD-SDI deck, of which we are currently aware, is 12 channels. In fact the only one that does support 12 channels is the Sony HDCAM SR which is a 4:4:4 deck.

  The driver software written for DeckLink cards supports the maximum number of embedded audio channels provided by current decks. That means that your DeckLink Pro will support up to 8 channels of embedded audio and any DeckLink HD series card will support up to 12 channels of embedded audio.

  The 16 channels of embedded audio supported in the soon-to-be-released Multibridge Extreme is the maximum number of audio channels provided by the HD-SDI standard.

  Out of interest, why do you want to add 24 audio channels to your video? That is a LOT of channels and only some AES hardware will support it. SDI certainly won’t support it.

  [OOctave] “Does the Multibridge SD do audio embeding from it’s SDI input to it’s SDI output, or do I need the multibdidge extreme”

  That’s a very good question. Please refer to the Multibridge SD specifications. A digital-digital workflow is not currently provided in the Multibridge SD although we might be able to do that in the future with a firmware update but we don’t know as it has not been tested. The current Multibridge and the forthcoming Multibridge Extreme do support digital-digital modes. The Multibridge performs the embedding on input so you can combine SDI video input with AES audio channels and the combined signal will appear on SDI output of Multibridge and you can then capture it with a DeckLink card.

  PCI Express is not going to help here as that doesn’t change the SDI specification of a maximum of 16 channels of SDI audio.

  Regards,

  Luke Maslen
  Blackmagic Design

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