Datapath Capture Card and two Graphic Cards

  • Hi there everyone,

    I'm new to the forum and if we go the Isadora way, will probably ask some more questions in the near future.
    Since Isadora 2 has improved so much (great job!!!) we are thinking about using it on one of our stages.
    For this I have to build custom PC's and I wonder if anyone has experience with Datapath Capture Cards (like this one: and Isadora?
    Will it be possible to get 4 streams of video (for example 3x Composite SD + 1x DVI HD) with this?
    The other thing I am thinking about is using two graphics card to get more outputs.
    A cheaper one for the Windows Desktop and one high end gamer card (for example GeForce GTX 970) for the Isadora output window.
    Has someone made some experience with a setup like this?
    Any comments are much appreciated.
    Thanks, David

  • Dear David,

    @DusX is going to get back to you with further information. But I wrote an email to datapath to ask if they'd lend me one the card you mentioned above so that I can do some tests. We'll see what they have to say.
    Best Wishes,

  • Hi,

    I use a this capture card:
    And i'm 99% sure the other card in that Mac Pro is a Nvidia Quadro 4800 (cant say 100% sorry different cards in different machines)
    I get good performance from both cards.
    Can capture 4 streams into the BM card but I use a range of BM convertors (analog to SDI / HDMI to SDI etc.) which can add a bit of latency (maybe 4-10 frames) its worst when doing and analog>digital conversion (not surprisingly).
    But for most projects it works just fine.

  • Thanks Mark, those are great news :) Your support is ver much appreciated.

  • Thank you danshorten, I know that Isadora works with Black Magic cards, but we like to use Datapath capture cards, since they offer the signal formats we are working with.

  • Tech Staff


    I do not have experience with the Datapath product so I can't comment on this.
    But your approach to building a PC with multiple video cards sounds correct.
    With the newer Isadora Version 2 features the Geforce GPU will provide amazing performance.
    If possible you may want to setup your PC with out optimus ( since this technology has been a issue for Spout video sharing (

  • @DavidF,

    Just an FYI: Datapath has not responded to my email. :-(
    Best Wishes,

  • That's a shame :(

    Can you make a presumption of how such a capture card with DirectX WDM streaming drivers will perform with Isadora?
    Best wishes,