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Forums Blackmagic Design Decklink HD Pro Single Link, Edit to Tape audio problems via SDI

  • Decklink HD Pro Single Link, Edit to Tape audio problems via SDI

  • Michael Buday

    July 30, 2007 at 6:49 pm

    Hopefully a Decklink guru may know what’s going on here:

    Trying to assemble edit to a DVW-A500 via SDI and embedded audio. After recording, picture looks fine, but the audio has a ‘gritty’ texture when playing back (also via SDI embedded). Sounds almost like mis-matched sample-rates (media is uncompressed 10-bit NTSC, 16bit, 48Khz audio.

    However, if use the “print-to-tape” function via the same signal path, everything sounds great. Huh???

    Anyone experienced this whacky behavior before?

    FCP 5.14
    Decklink 6.3 drivers
    NTSC reference via Tektronix SG


    Michael Buday

  • Kristian Lam

    July 31, 2007 at 12:22 am


    It’s possibly a reference issue. Check your VTR’s reference settings. If you’re not locked to house sync, switch the deck to reference the input video.


    Kristian Lam
    Blackmagic Design

  • Michael Buday

    July 31, 2007 at 2:03 am

    Hi Kristian,

    Thanks for your advice. It was indeed a reference issue. Setting the DVW’s OUTPUT REF switch to INPUT fixed the problem. However, I was feeding both the card and the DVW house sync, so I don’t see why this was an issue with the switch set to EXT REF.

    Michael Buday

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