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  • Decklink Studio SDI out garbled/flashing

  • Francois Stark

    April 30, 2010 at 8:30 am


    We have a new 8 core pac pro, Snow leopard 10.6.3, 6 GB RAM, with a new Decklink Studio card. Decklink 7.6 drivers. We are driving analogue Yamaha audio monitors, and a TVLogic HDSDI screen through a proper HDSDI cable.

    We have an intermittent problem on this system: Occasionally the SDI signal breaks up. Playback stutters and simultaneously there is a loud hiss as full-range noise gets sent to the analogue monitors too. A flash of white noise is seen on the CANVAS and on the HDSDI monitor. This repeats at about five times per second while playing the timeline. Apple-F12 to switch off external video, and the problem stops immediately. The Canvas plays perfectly while the external monitor is off.
    When we switch the external monitor on again (apple-F12) sometimes the problem goes away, and sometimes it re-occurs.

    The first thing I suspected was the Decklink card, since I have many other decklink cards running on FCP. We replaced the card with a brand new card and the problem persists.

    Two major differences between this system and out other, reliable decklink systems:
    1. All our other decklink systems are on 10.5.8. New one is on 10.6.3.
    2. Media – we are playing Sony XDCAM 1080i25 50mb/s media on a timeline with the same setting. Our other systems work with DV PAL and Prores HD codecs without issues.

    Any ideas? Driver bug?

  • Kristian Lam

    May 2, 2010 at 7:24 am

    What about hardware configuration differences in your machine? What other PCIe cards do you have?
    Which slot is the DeckLink card installed in? Does changing slots make a difference?


    Kristian Lam
    Blackmagic Design

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